ft Mngbvhe/m STATE OF ILLINOIS William G. Stratton, Governor DEPARTMENT OF REGISTRATION AND EDUCATION Vera M. Binks, Director 1957 Types of LATE CENOZOIC GASTROPODS in the Frank Collins Baker Collection, Illinois State Geological Survey A. Byron Leonard REPORT OF INVESTIGATIONS 201 ILLINOIS STATE GEOLOGICAL SURVEY JOHN C. FRYE, Chief URBANA, ILLINOIS Types of LATE CENOZOIC GASTROPODS in the Frank Collins Baker Collection, Illinois State Geological Survey A. Byron Leonard Illinois State Geological Survey Report of Investigations 201 Urbana, Illinois 1957 PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS STATE OF ILLINOIS HON. WILLIAM G. STRATTON, Governor DEPARTMENT OF REGISTRATION AND EDUCATION HON. VERA M. BINKS, Director BOARD OF NATURAL RESOURCES AND CONSERVATION Hon. Vera M. Binks, Chairman W. H. Newhouse, Ph.D., Geology Roger Adams, Ph.D., D.Sc, Ll.D., Chemistry Robert H. Anderson, B.S., Engineering A. E. Emerson, Ph.D., Biology Lewis H. Tiffany, Ph.D., Pd.D., Forestry Dean W. L. Everitt, E.E., Ph.D., University of Illinois President Delyte W. Morris, Ph.D., Southern Illinois University GEOLOGICAL SURVEY DIVISION JOHN C. FRYE, Ph.D., D.Sc, Chief (47664—2500—12-56) STATE GEOLOGICAL SURVEY DIVISION Natural Resources Building, Urbana JOHN C. FRYE, Ph.D., D.Sc, Chief M. M. Leighton, Ph.D., D.Sc, Chief, Emeritus Enid Townlev, M.S., Geologist and Assistant to the Chief Velda A. Millard, Junior Assistant to the Chief Helen E. McM orris, Secretary to the Chief RESEARCH (not including part-time personnel) GEOLOGICAL RESOURCES Arthur Bevan, Ph.D., D.Sc, Principal Geologist, Emeritus Frances H. Alsterlund, A.B., Research Assistant Coal Jack. A. Simon, M.S., Geologist and Head G. H. Cady, Ph.D., Senior Geologist and Head, Emeritus Robert M. Kosanke, Ph.D., Geologist Raymond Siever, Ph.D., Geologist (on leave) John A. Harrison, M.S., Associate Geologist Paul Edwin Potter, Ph.D., Associate Geologist William H. Smith, M.S., Associate Geologist Kenneth E. Clegg, M.S., Assistant Geologist Margaret A. Parker, M.S., Assistant Geologist David L. Reinertsen, A.M., Assistant Geologist Marcia R. Winslow, M.Sc, Assistant Geologist Oil and Gas A. H. Bell, Ph.D., Geologist and Head Virginia Kline, Ph.D., Associate Geologist Lester L. Whiting, B.A., Associate Geologist Wayne F. Meents, Associate Geological Engineer Margaret O. Oros, B.A., Assistant Geologist Jacob Van Den Berg, M.S., Assistant Geologist James H. Garrett, B.S., Research Assistant Petroleum Engineering Paul A. Witherspoon, M.S., Petroleum Engineer and Head Industrial Minerals J. E. Lamar, B.S., Geologist and Head Donald L. Graf, Ph.D., Geologist James C. Bradbury, A.M., Associate Geologist Meredith E. Ostrom, M.S., Assistant Geologist Physics R. J. Piersol, Ph.D., Physicist, Emeritus Clay Resources and Clay Mineral Technology Ralph E. Grim, Ph.D., Consulting Clay Mineralo- gist W. Arthur White, Ph.D., Geologist Herbert D. Glass, Ph.D., Associate Geologist Groundwater Geology and Geophysical Exploration George B. Maxey, Ph.D., Geologist and Head Merlyn B. Buhle, M.S., Geologist Robert E. Bergstrom, Ph.D., Associate Geologist James E. Hackett, M.S., Associate Geologist Paul W. Hughes, M.S., Assistant Geologist John P. Kempton, M.A., Assistant Geologist Wayne A. Pryor, M.S., Assistant Geologist (on leave) Lidia Selkregg, D.Nat.Sci., Assistant Geologist Margaret J. Castle, Assistant Geologic Drafts- man (on leave) Robert C. Parks, Technical Assistant Stratigraphy and Are a I Geology H. B. Willman, Ph.D., Geologist and Head Elwood Atherton, Ph.D., Geologist David H. Swann, Ph.D., Geologist Charles W. Collinson, Ph.D., Associate Geologist Donald B. Saxby, M.S., Associate Geologist T. C. Buschbach, M.S., Assistant Geologist F. L. Doyle, M.S., Assistant Geologist Romayne S. Ziroli, Technical Assistant Joseph F. Howard, Assistant Carol L. Wood, Assistant Engineering Geology and Topographic Mappwg George E. Ekblaw, Ph.D., Geologist and Head William C. Smith, M.A., Assistant Geologist GEOCHEMISTRY Frank H. Reed, Ph.D., Chief Chemist Grace C. Finger, B.S., Research Assistant Coal Chemistry G. R. Yohe, Ph.D., Chemist and Head Thomas P. Maher, B.S., Special Assistant Chemist Earle C. Smith, B.S., Research Assistant Fluorine Chemistry G. C. Finger, Ph.D., Chemist and Head Lawrence D. Starr, Ph.D., Associate Chemist Richard H. Shiley, B.S., Special Research Assist- ant Raymond H. W7hite_, B.S., Special Research Assist- ant Chemical Engineering H. W. Jackman, M.S.E., Che?nical Engineer and Head R. J. Helfinstine, M.S., Mechanical Engineer and Supervisor of Physical Plant B. J. Greenwood, B.S., Mechanical Engineer Robert L. Eissler, M.S., Assistant Chemical Engi- neer James C. McCullough, Research Associate (on leave) Walter E. Cooper, Technical Assistant Cornel Marta, Technical Assistant Edward A. Schaede, Technical Assistant October 15, 1956 Analytical Chemistry O. W. Rees, Ph.D., Chemist and Head L. D. McVicker, B.S., Chemist Emile D. Pierron, M.S., Associate Chemist William J. Armon, M.S., Assistant Chemist Francis A. Coolican, B.S., Assistant Chemist Donald R. Dickerson, B.S., Assistant Chemist Charles T. Allbright, B.S., Research Assistant (on leave) Joan M. Cederstrand, Research Assistant Sally K. Diller, B.A., Research Assistant Joseph M. Harris, B.A., Research Assistant Raymond A. Napiwocki, Research Assistant JoAnne K. Wilken, B.A., Research Assistant George R. James, Technical Assistant Physical Chemistry J. S. Machin, Ph.D., Chemist and Head Juanita Witters, M.S., Assistant Physicist Daniel L. Deadmore, M.S., Assistant Chemist Kozo Nagashima, Ph.D., Special Assistant Chem- ist Paul E. McMahon, M.S., Research Assistant X-Ray W. F. Bradley, Ph.D., Chemist and Head RESEARCH (cont'd) (not including part-time personnel) EDUCATIONAL EXTENSION George M. Wilson, M.S., Geologist and Head Shirley Fahlsing, Assistant Geologic Draftsman Shirley Trueblood, B.S., Research Assistant MINERAL ECONOMICS W. H. Voskuil, Ph.D., Mineral Economist W. L. Busch, A.B., Assistant Mineral Economist Ethel M. King, Research Assistant JoAnn Munnis, Technical Assistant GENERAL ADMINISTRATION (not including part-time personnel) PUBLICATIONS Rose, B.S., Technical Editor Calkins, Geologic Draftsman Assistant Geologic Drafts- Dorothy E. Meredith M. Nancy Rosenwinkel, man Donna R. Wilson, Assistant Geologic Draftsman GENERAL SCIENTIFIC INFORMATION Genevieve Van Heyningen, Technical Assistant Marian L. Wingard, Technical Assistant LIBRARY Olive B. Ruehe, B.S., Geological Librarian MINERAL RESOURCE RECORDS Vivian Gordon, Head Sandra Mynlieff, B.A., Research Assistant Sue J. Cunningham, Technical Assistant Hannah Fisher, Technical Assistant Jane T. Hill, B.A., Technical Assistant Yvonne Hoppenstedt, Technical Assistant Margery J. Miller, B.A., Technical Assistant Rosemary H. Reinarts, B.A., Technical Assistant Elizabeth Speer, Technical Assistant Joan R. Younker, Technical Assistant TECHNICAL RECORDS Berenice Reed, Miriam Hatch, Supervisory Technical Assistant Technical Assistant OTHER TECHNICAL SERVICES Wm. Dale Farris, Research Associate Beulah M. Unfer, Technical Assistant A. W. Gotstein, Research Associate Glenn G. Poor, Research Associate* Gilbert L. Tinberg, Technical Assistant Wayne W. Nofftz, Supervisory Technical Assist- ant Donovan M. Watkins, Technical Assistant Mary Cecil, Supervisory Technical Assistant Ruby D. Frison, Technical Assistant Malathi A. Rao, M.A., M.A., Technical Assistant ^Divided time October 15, 1956 FINANCIAL RECORDS Velda A. Millard, In Charge Leona K. Erickson, Clerk IV (on leave) Virginia C. Sanderson, B.S., Clerk-Typist III Irma E. Samson, Clerk-Typist II Patricia A. Northrup, Clerk-Typist I CLERICAL SERVICES Mary M. Sullivan, Clerk-Stenographer III Lyla Nofftz, Clerk- Stenographer II Lillian Weakley, Clerk- Stenographer II Dorothy A. Ledbetter, Clerk-Stenographer I Virginia Champion, Clerk-Stenographer I Marilyn Scott, Clerk-Stenographer I Laurel F. Griffin, Clerk-Typist I Marion L. Kenney, Clerk-Typist I William L. Mathis, Messenger-Clerk II Lorene G. Wilson, Messenger-Clerk I AUTOMOTIVE SERVICE Glenn G. Poor, In Charge* David B. Cooley, Automotive Mechanic Everette Edwards, Automotive Mechanic (on leave) Robert O. Ellis, Automotive Mechanic RESEARCH AFFILIATES IN GEOLOGY University of Chicago Assistant Geologist, State J Harlen Bretz, Ph.D. John A. Brophy, M.S. Geol. Survey Stanley E. Harris, Jr., Ph.D., Southern Illinois University M. M. Leighton, Ph.D., D.Sc, Research Profes- sional Scientist, State Geol. Survey A. Byron Leonard, Ph.D., University of Kansas Paul R. Shaffer, Ph.D., University of Illinois Harold R. Wanless, Ph.D., University of Illinois CONSULTANTS Geology: George W. White, Ph.D., University of Illi- nois Ralph E. Grim, Ph.D., University of Illinois Mechanical Engineering: Seichi Konzo, M.S;, Uni- versity of Illinois Topographic Mapping in Cooperation with the United States Geological Survey. CONTENTS The Frank Collins Baker Collections 7 Description of Fossils 8 Amnicola greenensis Baker . 8 Amnicola lustrica gelida Baker 8 Amnicola precursor Baker 9 Amnicola winkleyi leightoni Baker 9 Bulimus tentaculatus magnalacustris Baker 9 Carychium perexiguum Baker 10 Fossaria dalli grandis Baker 11 Gonyodiscus macclintocki Baker 11 Gonyodiscus macclintocki angulata Baker 12 Gyraulus cressmani Baker 12 Gyraulus pattersoni Baker. 12 Menetus kansasensis Baker 13 Parapholyx packardi corrugata Baker 13 Planorbis altissimus Baker 13 Planorbis campanulata ferrissi Baker 14 Planorbis parvus urbanensis Baker 14 Planorbula indianensis Baker 15 Polygyra appressa hubrichti Baker 16 Polygyra hirsuta yarmouthensis Baker 16 Polygyra monodon peoriensis Baker 16 Polygyra multilineata altonensis Baker 16 Polygyra multilineata wanlessi Baker .17 Polygyra proj 'unda pleistocenica Baker 17 Pomatiopsis scalaris Baker 17 Stenotrema hubrichti Pilsbry 18 Strobilops sparsicostata Baker 18 Succinea grosvenorii gelida Baker 19 Succinea ovalis pleistocenica Baker 19 Succinea retusafultonensis Baker 19 Valvata lewisii precursor Baker 20 Valvata sincera illinoisensis Baker 20 Valvata tricarinata supracarinata Baker 20 Vertigo gouldii loessensis Baker 21 Vertigo hibbardi Baker 21 Selected bibliography 22 ILLUSTRATIONS Plate 1 facing 10 Plate 2 facing 11 Plate 3 facing 14 Plate 4 facing 15 Digitized by the Internet Archive in 2012 with funding from University of Illinois Urbana-Champaign http://archive.org/details/typesoflatecenoz201leon TYPES OF LATE CENOZOIC GASTROPODS IN THE FRANK COLLINS BAKER COLLECTION, ILLINOIS STATE GEOLOGICAL SURVEY A. BYRON LEONARD ABSTRACT Types of late Cenozoic fossil gastropods that are in the Illinois State Geological Sur- vey collections are listed, illustrated by photographs, and accompanied by essential data, including catalog number, original description, type locality, and name of collector. Of the 34 types, all were described by Frank Collins Baker, except the one species from loess deposits in Illinois described by H. A. Pilsbry. A brief outline of Baker's scientific activi- ties and a selected bibliography of his studies of fossil gastropods are included. THE FRANK COLLINS BAKER COLLECTIONS The molluscan materials that Frank Col- lins Baker studied during his professional life of more than fifty years are widely dispersed among several collections. Baker began his study of Mollusca as a Jesup Scholar at the Academy of Natural Sciences in Philadel- phia ; in this capacity he took part in a scien- tific expedition to Mexico sponsored by the Academy in 1890. The next two years (1891-92) Baker spent at Ward's Natural Science Establishment, Rochester, New York, where he was in charge of the invertebrate collections. The following year he assisted in setting up Ward's scientific exhibits for the Chicago World's Fair. He remained in the Middle West to become Curator of Zoology in the Field Columbian Museum of Natural His- tory, Chicago, but after one year accepted the position of curator in the museum of the Chi- cago Academy of Sciences, where he remained from 1894 to 1915. The museum of the Chicago Academy of Sciences houses the collections upon which Baker based his "Mollusca of the Chicago Area" (1902). "Lymnaeidae of North and Middle America" (1911), written while Baker was at the Chicago Academy, was based largely upon his private collections of gastropods of that family, collections that the Smithsonian Institution acquired after his death. After spending two years as a special zoological investigator at the University of Syracuse in New York, Baker became Cura- tor of the Museum of Natural History at the University of Illinois in 1918, a position he held until his retirement as Curator Emeri- tus in 1939. The summers of 1920 to 1923 Baker spent in study of the fresh-water mollusks of Wis- consin, under the auspices of the Wisconsin Geological and Natural History Survey. These studies resulted in two impressive vol- umes (1928) that discuss the fresh-water gas- tropods and pelecypods of Wisconsin in ex- haustive detail. The collections of Wiscon- sin Mollusca, housed at the University of Wisconsin at Madison, include many new species described by Baker. Several significant publications, along with a great number of shorter papers, resulted from Baker's study of Illinois Mollusca. "The Life of the Pleistocene" ( 1920) and his "Fieldbook of Illinois Land Snails" (1939) are outstanding examples. Before his death in 1942, Baker was vigorously pursuing a study of the Planorbidae of the world. Part of this study was assembled and published (1945), after Baker's death, by the late Harley Van Cleave of the University of Illi- nois. The studies on the Planorbidae were based largely on Baker's private collections of planorbid gastropods; these, like the col- lections of the Lymnaeidae, went to the Smithsonian Institution. [7] ILLINOIS STATE GEOLOGICAL SURVEY Significant assemblages of type specimens of species described by Baker are housed at the Chicago Museum of Natural History, the Chicago Academy of Sciences, the Uni- versity of Wisconsin, and the University of Illinois. Baker customarily deposited para- typical specimens of new species in the Acad- emy of Natural Sciences of Philadelphia. There are no less than three collections of Mollusca at the University of Illinois — one in the Museum of Natural History, one forming part of the collections of the Nat- ural History Survey, and one, composed largely of molluscan fossils from Illinois, in the paleontological collections of the Illinois State Geological Survey. Type specimens of species described by Baker are found in all of these collections, and undoubtedly there are types in still other collections, probably many in those acquired by the Smithsonian Institution. The type specimens of the many species and subspecies described by Baker are widely dispersed. It therefore seemed desirable to make a permanent record of the type fossil gastropods in the paleontological collections of the Illinois State Geological Survey. The type specimens are listed alphabetically under the name combination used at the time of their description. When the name combina- tion in common use today differs from the original, the present name has been placed beneath the original name. This procedure, however, is not to be construed as a syste- matic revision of the several species con- cerned. The taxonomic validity of the species and subspecies listed here is not under con- sideration in this paper. Age designations of the sediments from which the fossils came are given as they were indicated by Baker. Concepts of Pleistocene stratigraphy have evolved greatly since Baker made his collections but verification of their stratigraphic placement was not attempted in this report. Catalog numbers of the Illinois State Geo- logical Survey are indicated by the symbol ISGS ; numbers of the Academy of Natural Sciences of Philadelphia, where Baker habit- ually deposited paratypes, are indicated by the symbol ANSP. DESCRIPTION OF FOSSILS Amnicola greenensis Baker, 1928 Plate 1, figure 9 Paratypes: Two specimens, cat. no. Z16222, ISGS. Original description: Wisconsin Geol. and Nat. Hist. Survey Bull. 70, pt. I, p. 113, pi. VI, figs. 32, 33. 1928. "Shell large for the genus, rather solid, turreted ; surface smooth, with rather coarse lines of growth; spire elevated, conic, longer than aperture; whorls 5%, flatly rounded, somewhat shouldered just below suture, which is deeply impressed or even channelled ; whorls rapidly and regularly increasing in diameter; nucleus small, finely granular, rounded, of one whorl, well raised above the second whorl ; aperture ovate or roundly ovate, angled above, the peristome continu- ous, thin, appressed to the body whorl near the upper part of the aperture ; base rounded, with a well-marked, narrow and deep um- bilicus." Length, 5.3 ; width, 3.5 ; aperture length, 2.3; width, 1.6 mm. Figured paratype. (Bak- er's measurements.) Type locality: Green Lake, off Sherwood Forest Hotel, Green Lake County, Wiscon- sin. Collector: Wisconsin Geological and Nat- ural History Survey party, 1921. Age designation: Pleistocene, Late Wis- consin. Remarks: The holotype, no. 4544, is in the University of Wisconsin collection. Amnicola lustrica gelida Baker, 1921 Amnicola gelida Baker Plate 1, figure 14 Holotype: Cat. no. P926, ISGS. Original description: Nautilus, v. 35, p. 22, July 1921. "Shell differing from lustrica in being nar- rower, with more convex whorls, more deep- LATE CENOZOIC GASTROPODS 9 ly impressed sutures, a smaller, rounder aper- ture, the lip of which is usually thickened within. There are six full whorls in adult individuals." Length, 4.25; diameter, 2.25; aperture length, 1.25; width, 1.0 mm. Holotype. (Baker's measurements.) Type locality: Marl deposit near Morris, Grundy County, Illinois. Collector: F. C. Baker, 1921. Age designation: Pleistocene, Late Wis- consin. Remarks: The ISGS collection contains two paratypes, no. P927. Baker later (Wis- consin Geol. and Nat. Hist. Surv. Bull. 70, pt. I, p. 112 ) raised gelida to a full species; the collection contains many lots from differ- ent localities, identified by Baker as A. gelida. Amnicola precursor Baker, 1928 Plate 1, figure 8 Holotype: Cat. no. Z22508, ISGS. Original description: Wisconsin Geol. and Nat. Hist. Survey Bull. 70, p. 116, pi. VII, fig. 5; text fig. 47 (6-9); 1928. "Shell: Small, conic, rather thick, surface with rather coarse, close-set growth lines; spire broadly conic, elevated, much longer than aperture; whorls 5%, very convex, reg- ularly but not rapidly increasing in diam- eter ; sutures very deeply impressed ; apex ob- tuse, flattened, the nuclear whorl small, rounded, finely granular in texture, slightly elevated above second whorl; aperture al- most circular, slightly angled above; peris- tome continuous; base rounded, umbilicus wide and deep." Length, 3.0; width, 2.3; aperture length, 1.4; width, 1.2 mm. Type. Female? (Bak- er's measurements.) Type locality: Green Lake, Green Lake County, Wisconsin, off Sherwood Forest Hotel, below seven meters of mud. Collector: Wisconsin Geological and Nat- ural History Survey party, July 7, 1921. Age designation: Pleistocene, Late Wis- consin. Remarks: The ISGS collection contains three paratypes, bearing the same number as the type, as well as many other lots identified by Baker as A. precursor. Amnicola winkleyi leightoni Baker, 1920 Amnicola leightoni Baker Plate 1, figure 10 Holotype: Cat. no. P598, ISGS. Original description: Nautilus, v. 33, p. 125, April 1920. "Shell differing from A. winkleyi in be- ing larger, heavier, wider in proportion to its height, the body whorl being more globose than in the typical form; there are 4^4 whorls, the upper part of which is somewhat flat-sided just below the suture; this is espe- cially marked on the last whorl of some in- dividuals; the spire whorls are rounded and the sutures deeply impressed ; the first whorl is flatter than in winkleyi) the umbilicus is wider and deeper and the aperture is wider in proportion to its height than in winkleyi. Length, 5.0; diameter, 3.7; length of aper- ture, 2.5 ; width, 2.0 mm." Holotype. Type locality: Rush Lake, Logan County, Ohio. Collector: M. M. Leighton, 1919. Age designation: Pleistocene, Late Wis- consin. Remarks: The ISGS collection contains two specimens labeled "paratypes," cat. no. P599, and ten examples labeled "cotypes," cat. no. P600. In 1921, Baker (Nautilus, v. 35, p. 23) raised leightoni to the rank of full species. Many lots in the collection bear this designation. BULIMUS TENTACULATUS MAGNALACUSTRIS Baker, 1928 Plate 4, figure 4 Paratypes: Cat. no. Z22506 and P2819, ISGS. Original description: Wisconsin Geol. and Nat. Hist. Survey Bull. 70, pt. 1, p. 81, pi. IV, figs. 22-23, 26-31, 1928. "Globosely turbinated, rather thick, trans- parent to opaque ; color ranging from yellow- ish to greenish, with thin brownish epider- mis; surface shining, lines of growth fine, 10 ILLINOIS STATE GEOLOGICAL SURVEY crossed by numerous very fine incised spiral lines; sutures deeply impressed; whorls 5y2, convex, the last rapidly enlarging and equal- ling all the others combined; spire elevated, broadly conic; epiconch or nucleus small, round, without striae, reddish brown; aper- ture broadly rounded-ovate, narrowed above ; peristome continuous, rounded, simple, thick- ened a little on the inside, bordered all around with yellowish; inner lip appressed to the columellar [body] wall, thickened at the edge; the base may be imperforate or there may be a small umbilical chink." Length, 10.8; diameter, 6.7; aperture length, 5.4; diameter, 3.9 mm. (Measure- ments are mine; Baker gave none for this paratype.) Locality of paratype: Southwest corner of Michigan Boulevard and Walton Place, Chicago, Cook County, Illinois. Collector: Alvin R. Cahn, date unknown. Age designation: Late Wisconsin. Remarks: The notations concerning color were based on the shells from living snails, but the shells from the late Wisconsin de- posits in Chicago still retain much of their color. Carychium perexiguum Baker, 1938 Plate 1, figure 1 Holotype: Cat. no. P6776, ISGS. Original description: Nautilus, v. 51, p. 128, April 1938. "Shell shorter and more solid than that of exiguum, the sutures more deeply im- pressed and whorls rounder, sometimes shoul- dered at the upper part. Whorls 5, the apical whorls somewhat smaller than in exiguum. Aperture a trifle more than one third of the length of the shell. Margin of aperture with thickened, callus-like lip extending basally to the parietal callus, which is well marked. There is a conspicuous callosity just above the middle of the outer lip. Umbilical re- gion closed by the thickened basal lip. La- mella on columella conspicuous, tubercular, the fold extending upward spirally within the whorls much as in exiguum but it is nar- rower and bent upward over the axis in front. Lower lamella inconspicuous but heavier than in exiguum. Length, 1.8; diam- eter 8.5 [sic for 0.85] mm. Holotype." Type locality: Rexroad Ranch, SW*4 sec. 22, T. 33 S., R. 29 W., Meade County, Kansas. PLATE 1 Carychium perexiguum Baker, holotype, cat. no. P6776, ISGS: Rexroad Ranch, SWJ4 sec. 22, T. 33 S., R. 29 W., Meade County, Kansas, Enlarged 7.2 times. Vertigo gouldii loessensis Baker, holotype, cat. no. P2366, ISGS; 33^ miles west, 1% miles south of Lewistown, Fulton County, Illinois. Enlarged 10 times. Vertigo hibbardi Baker, holotype, cat. no. P6773, ISGS; Rexroad Ranch, SW34 sec. 22, T. 33 S., R. 29 W., Meade County, Kansas. Enlarged 10 times. 5, 6. Strobilops sparsicostata Baker, holotype, cat. no. P6774, ISGS; spiral, basal and apertural views, respectively; Rexroad Ranch, SW}4 sec. 22, T. 33 S., R. 29 W., Meade County, Kansas. Enlarged 8.9 times. Pomatiopsis scalaris Baker, holotype, cat. no. P2321, ISGS; New Harmony, Posey County, Indiana. Enlarged 3.8 times. Amnicola precursor Baker, holotype, cat. no. Z22508, ISGS; Green Lake, off Sherwood Forest Hotel, Green Lake County, Wisconsin. Enlarged 8.4 times. Amnicola greenensis Baker, paratype, cat. no. Z16222, ISGS; Green Lake, off Sherwood Forest Hotel, Green Lake County, Wisconsin. Enlarged 4 times. Amnicola winkleyi leightoni Baker, holotype, cat. no. P598, ISGS; Rush Lake, Logan County, Ohio. Succinea ovalis pleistocenica Baker, holotype, cat. no. 2088A, ISGS; 3 miles southwest of Marshall, Clark County, Illinois. Enlarged 3.8 times. Succinea retusa fultonensis Baker, holotype, cat. no. P2368, ISGS; 2^ miles west, % mile south of Lewistown, Fulton County, Illinois. Enlarged 3.8 times. Succinea grosvenorii gelida Baker, holotype, cat. no. P875A, ISGS; % mile northwest of railway depot, Irene, Boone County, Illinois. Enlarged 4.1 times. Amnicola lustrica gelida Baker, holotype, cat. no P926, ISGS; near Morris, Grundy County, Illi- nois. Enlarged 8 times. Fossaria dalli grandis Baker, holotype, cat. no. P972A, ISGS; Fair Grounds, Joliet, Will County, Illinois. Enlarged 8 times. Fig. 1. Fig. 2. Fig. 3. Figs ,4, Fig. 7. Fig. 8. Fig. 9. Fig. Fig. 10. 11. Fig. 12. Fig. 13. Fig. 14. Fig. 15. HI Hi HI •J' HI H4V— H—V^HHJ flL^ill H^h^^QHW£H r Wm IHHX ^| i^HJ HL .^H ^Ht^P ^^T HJ - HP V^"^ .^ ^H II 1 P Br ■ x^M i Hk { fwl ,^| Hj ^HH^Hl HHl ^™ LATE CENOZOIC GASTROPODS 11 Collector: C. W. Hibbard and party, sum- mer, 1937. Age designation: Pleistocene, late Ne- braskan, in Blanco formation. Remarks: Three paratypes, numbered the same as the type, and three paratypic shells, no. P6777, dissected to show structure, are in the ISGS collection. The species is wide- spread in the central Great Plains, where it occurs in Kansan as well as Nebraskan de- posits (Leonard, 1950, Univ. Kansas Paleo. Contrib., Art. 3, Mollusca, p. 1-48). A typographical error occurs in the place- ment of the decimal point in the table of measurements given in the original descrip- tion; in all measurements of diameter, the decimal point should be moved one place to the left, that is, 8.5 mm. should read 0.85 Fossaria dalli grandis Baker, 1930 Plate 1, figure 15 Holotype: Cat. no. P972A, ISGS. Original description: Trans. Illinois Acad. Sci., v. 22, p. 427, 1930. "The Fossaria dalli of the Pleistocene is uniformly larger, with five to 5% full whorls, the sutures deeper and the whorls rounder, the whole shell wider, the aperture longer and narrower. The type specimen measures: L. 4.5; W. 2.4; Ap. L. 2.3; W. 1.3 mm. (No. P372A [sic for P972A], Mus. Nat. Hist., collected by J. H. Ferris from marl beds in the Fair Ground in Joliet, Will Co. Late Wisconsin age). Referable to this variety are also specimens from the Yar- mouth interval (Clark Co.), and three de- posits in Late Wisconsin (Carroll, Will, and Whiteside Co.). All are uniformly larger than the recent form, which only rarely at- tains any such proportions in length, and never in width and general size. The recent dalli is undoubtedly the descendant of the larger Pleistocene variety." Length, 4.5; width, 2.4; aperture length, 2.3; width, 1.3 mm. (Baker's measure- ments.) Type locality: Excavation in marl, Fair Grounds, Joliet, Will County, Illinois. Collector: J. H. Ferris, 1921. Age designation: Pleistocene, Late Wis- consin. Remarks: The ISGS collection contains ten paratypic specimens, cat. no. P972B, and many lots from Pleistocene deposits at many different localities. Gonyodiscus macclintocki Baker, 1927 Discus macclintocki (Baker) Plate 2, figures 10-12 Holotype: Cat. no. P2367, ISGS. Original description: Nautilus, v. 41, p. 133, April 1927. "Shell orbicular, with convex, dome- shaped spire; whorls six, slowly and regu- larly increasing in size, tightly wound, slightly convex, the body whorl typically flatly rounded; sutures well impressed; base flatly rounded, excavated near the widely open umbilicus, which exhibits all of the PLATE 2 Figs. 1, 2, 3. Menetus kansasensis Baker, holotype, cat. no. P6778, ISGS; spiral, basal and apertural views, respectively; Rexroad Ranch, SW34 sec. 22, T. 33 S., R. 29 W., Meade County, Kansas. Enlarged 3.3 times. Figs. 4, 5, 6. Gyraidus pattersoni Baker, holotype, cat. no. 26128, Chicago Natural History Museum; spiral, basal, and apertural views, respectively; 6 miles north of Ainsworth, Brown County, Nebraska. Enlarged 8 times. Figs. 7, 8, 9. Planorbis parvus urbanensis Baker, holotype, cat. no. Z10772, ISGS; spiral, basal and apertural views, respectively; Campus, University of Illinois, Urbana, Champaign County, Illinois. Enlarged 7.2 times. Figs. 10, 11, 12. Gonyodiscus macclintocki Baker, holotype, cat. no. P2367, ISGS; spiral, basal, and apertural views, respectively; 33^ miles east and 1% miles south of Lewistown, Fulton County, Illinois. En- larged 3.2 times. Figs. 13, 14, 15. Gonyodiscus macclintocki angulata Baker, holotype, cat. no. P2359, ISGS; spiral, basal, and apertural views, respectively; 4 miles west of bridge, Havana, in Fulton County, Illinois. Enlarged 3.2 times. Figs. 16, 17. Parapholyx packardi corrugata Baker, holotype, cat. no. P7451, ISGS; spiral and apertural views, respectively; well boring, near Summer Lake, Lake County, Oregon. Enlarged 4 times. 12 ILLINOIS STATE GEOLOGICAL SURVEY whorls including the nucleus; sculpture of many close-set, distinct ribs, which become finer on the base, there being usually an al- most smooth space in the center of [the] lower part of the body whorl; aperture widely or roundly lunate, arched above where the outer lip joins the body whorl; peris- tome simple, acute, without parietal callus, the terminations of the outer and columellar lip being widely separated." Height, 3.6; diameter, 6.5 mm. (Baker's measurements.) Type locality: Three and one-half miles east and one and three-quarters miles south of Lewistown, Fulton County, Illinois. Collector: H. R. Wanless, summer, 1927. Age designation: Pleistocene, Peorian loess. Remarks: Three paratypes in the ISGS collection bear the same number as the holo- type; other paratypes, ANSP, no. 145108. Many lots in the ISGS collection from Wis- consin loess are identified as G. macclintocki, GONYODISCUS MACCLINTOCKI ANGULATA Baker, 1927 Discus macclintocki angulata (Baker) Plate 2, figures 13-15 Holotype: Cat. no. P2359, ISGS. Original description: Nautilus, v. 41, p. 134, April 1927. "Shell differing from typical macclintocki in having a more depressed somewhat flat- tened spire, flatter base and shallow umbili- cus, and a subangulated periphery. On the average rather larger than the typical form." Height, 2.9; diameter, 6.2 mm. (Baker's measurements.) Type locality: Four miles west of bridge at Havana, in Fulton County, Illinois. Collector: H. R. Wanless, summer, 1927. Age designation: Pleistocene, Yarmouth loess. Remarks: Two damaged paratypical speci- mens, bearing same number as the type, are in ISGS collections; other paratypes, ANSP, no. 144922. Baker remarks (p. 134) : "This angulated form persisted throughout the Yarmouth in- terval and died out in the Peorian, a few scattered specimens having been seen among a large number of the rounded-whorled Pe- orian form." Gyraulus cressmani Baker, 1942 Plate 3, figures 1-3 Holotype: Cat. no. P7453, ISGS. Original description: Nautilus, v. 55, p. 130, April 1942. "Shell of about the size of Gyraulus ver- micularis (Gould), of 3%-4 rounded whorls rapidly increasing in diameter, the sutures deeply impressed, the inner whorls of the right side below the level of the body whorl ; left side with rounded whorls and deep su- tures; periphery rounded and obliquely de- flected; sculpture of coarse growth lines, sometimes slightly costate, with more or less deeply incised spiral lines." Height, 1.5; greater diameter, 4.0; lesser diameter, 3.3; aperture height, 1.0; diameter, 1.5 mm. Holotype. (Baker's measurements.) Type locality: South end of Lower Klam- ath Lake, sees. 25, 26, T. 47 N., R. 2 E., Mt. Diabolo Merid., Siskiyou County, California. Collector: L. S. Cressman. Age designation: Late Pleistocene. Remarks: The ISGS collection has seven paratypic examples, no. P7454. Gyraulus pattersoni Baker, 1938 Plate 2, figures 4-6 Holotype: Cat. no. 26128, Chicago Nat- ural History Museum (formerly Field Mu- seum of Natural History). Original description: Nautilus, v. 51, p. 129, April 1938. "Shell completely discoidal, flat on upper and lower sides (right and left) ; periphery flattened and almost as high as the height of the shell, a rounded angle bordering the body whorl above and below; whorls 3^2> slowly and regularly increasing in diameter; sutures well impressed ; sculpture consist- ing of fine lines of growth crossed by fine spiral lines; on the nucleus only the spiral lines are developed, the growth lines begin- ning at about a fourth of the turn of the first whorl; aperture not expanded, wider than high, roundly flattened at the upper part (the shell is ultradextral), almost horizon- LATE CENOZOIC GASTROPODS 13 tal at the lower part, without peripheral cal- lus; the peristome is thickened in adult specimens. "Height 0.50; diameter 2.10; aperture height 0.45 ; diameter .35 mm. Holotype." Type locality: Six miles north of Ains- worth, Brown County, Nebraska. Collector: Bryan Patterson. Age designation: Pleistocene, Kansan. Remarks: The Chicago Natural History Museum has para types, no. 26129; other paratypes, no. P6778, ISGS, no. 169948, ANSP. Leonard, who found this distinctive spe- cies widely dispersed in Pleistocene deposits of Kansan age, reports (Univ. Kansas Paleo. Contrib., art. 3, Mollusca, p. 20, pi. 3, fig. 1, 1950) that adults possess six whorls, and measure 4.0 mm. in diameter. Menetus kansasensis Baker, 1938 Plate 2, figures 1-3 Holotype: Cat. no. P6778, ISGS. Original description: Nautilus, v. 51, p. 129, April 1938. "Shell lenticular as in M. exacuous (Say). Periphery carinate with a 'pinched' border as in M. a. Megas [sic] (Dall). Whorls 3%. Umbilicus wide, shallow, the whorls rounding into it. Sculpture consisting of more or less regularly spaced ribs extending from the suture in a backward curve to and over the periphery to the base and into the umbilicus. The ribs may be equally spaced, with strong growth lines between, or they may be so crowded together as to form a continuous series of ribs without intervening spaces. The surface above and below is covered with strong spiral lines. "Length 1.0; diameter 5.0 mm. Holo- type." Type locality: Rexroad Ranch, SW^4 sec. 22, T. 33 S., R. 29 W., Meade County, Kansas. Collector: C. W. Hibbard and party, July 1937. Age designation: Pleistocene, late Nebras- kan, in Blanco formation. Remarks: The ISGS collection contains two series of paratypes, no. P6778 and no. P7456. Parapholyx packardi corrugata Baker, 1942 Plate 2, figures 16, 17 Holotype: Cat. no. P7451, ISGS. Original description: Nautilus, v. 55, p. 132, April 1942. "Shell of 3-31/2 whorls, the spire flattened or slightly elevated, the body whorl very large; sutures not well impressed; aperture about as wide as high, rounded above, slightly angulated below; columella thick- ened by a heavy plait parallel with the axis; umbilicus closed or with a slight vertical chink; there is no evidence of a tooth on the columella as described for packardi) sculp- ture of coarse growth lines or of distinct, regular ribs evenly spaced; spiral lines show- ing faintly in some specimens." Height, 8.5; maximum diameter, 10.5; lesser diameter, 7.9; aperture height, 7.0; diameter, 6.9 mm. Holotype. (Baker's measurements.) Type locality: Near Summer Lake, Lake County, Oregon; well boring at depth of 1080 feet. Collector: C. L. Huffaker. Age designation: Pliocene? Remarks: The ISGS collection contains 12 paratypic examples, including 5 juvenile shells, no. P7452. Planorbis altissimus Baker, 1919 Gyraulus altissimus (Baker) Plate 3, figures 7-9 Holotype: Cat. no. Z10775, ISGS. Original description: Nautilus, v. 32, p. 95, pi. VII, figs. 7-10, January 1919. "Shell depressed, with flatly rounded pe- riphery which is placed below the center of the whorl; lines of growth fine, crowded, but surface without spiral ornamentation ; whorls 4, regularly increasing in diameter, sloping flatly to the rounded periphery; spire whorls sunken below the general level of the surface, the whorls forming a rather sharp v-shaped suture, causing the shell to 14 ILLINOIS STATE GEOLOGICAL SURVEY resemble a miniature Planorbis antrosus and producing a subacute carina on the upper surface of the whorls; base of shell deeply concave, forming a wide, saucer-shaped de- pression and umbilicus; the earlier whorls are carinate on the under side but the last whorl is rounded; the last half of the last whorl is markedly deflected, forming a con- tact with but half of the preceding whorl; aperture roundly ovate, shouldered above, the dorsal margin much produced over the ventral margin, the parietal callus joining the margins and causing the aperture to be continuous. "Height at aperture 2.00; greatest diam- eter 4.50 mm. Holotype." Type locality: Campus of University of Illinois, Urbana, Champaign County, Illi- nois; marls exposed in excavations for foot- ings of south greenhouse. Collector: T. E. Savage. Age designation: Early Wisconsin marl. Remarks: Three paratypic examples, no. Z10776, are in the ISGS collection, together with many other lots from waterlaid depos- its referred to as Early Wisconsin in age. Planorbis campanulata ferrissi Baker, 1922 Helisoma campanulata ferrissi (Baker) Plate 3, figures 10-12 Holotype: Cat. no. P1068A, ISGS. Original description: Trans. Illinois Acad. Sci., v. 15, p. 412, 1923. "The shells from the Joliet marls are dif- ferent from the recent form of typical cam- panulatus. The whorls are not as high, giv- ing the shell the appearance of having a greater diameter and more whorls. The marl form is also smaller on the average and the aperture is not as widely campanulate as in the recent form." Whorls 5, height, 4.6; maximum diameter, 11.5; minimum diameter, 8.5 mm. (Baker's measurements.) Type locality: Fair Grounds at Joliet, sec. 11, T. 35 N., R. 9 E., Will County, Illinois, in marl deposits. Collector: D. J. Fisher, 1921. Age designation: Pleistocene, Late Wis- consin marl. Remarks: The ISGS collection has two series of paratypes, both from the type lo- cality: no. PI 068, eight specimens; no. PI 066, eight specimens. Planorbis parvus urbanensis Baker, 1919 Gyraulus urbanensis (Baker) Plate 2, figures 7-9 Holotype: Cat. no. Z10772, ISGS. Original description: Nautilus, v. 32, p. 94, pi. VII, figs. 4-6, January 1919. "Shell differing from parvus by having a round aperture, the last third of the body whorl being depressed below the general level of the spire, deeper sutures, channelled in most individuals, and a deeper umbilical re- gion. The body whorl has not quite as great transverse diameter as in typical parvus. In parvus, the whorls are typically in the same plane, the aperture is oblong or long ovate and the sutures are impressed but not channelled. The umbilical region is also less impressed and has a 'reamed out' appear- ance. "Height at aperture, 1.0; greatest diam- eter, 3.00 mm. Holotype." PLATE 3 Figs. 1, 2, 3. Gyraulus cressmani Baker, holotype, cat. no. P7453, ISGS; spiral, basal, and apertural views, respectively; south end of Klamath Lake, Siskiyou County, California. Enlarged 8 times. Figs. 4, 5, 6. Planorbula indianensis Baker, holotype, cat. no. P2833, ISGS; spiral, basal, and apertural views, respectively; Uniontown Road, 2 miles southwest of Mt. Vernon, Posey County, Indiana. Enlarged 4 times. Figs. 7, 8, 9. Planorbis altissimus Baker, holotype, cat. no. ZI0775, ISGS; spiral, basal, and apertural views, respectively; Campus, University of Illinois, Urbana, Champaign County, Illinois. Enlarged 8.8 times. Figs. 10, 11, 12. Planorbis campanulata ferrissi Baker, holotype, cat. no. P1068A, ISGS; spiral, basal, and apertural views, respectively; Fair Grounds, Joliet, sec. 11, T. 35 N., R. 9 E., Will County, Illinois. Enlarged 3.2 times. W "^ ^ ■■l ■■■< ■ ■■ 'JSHlB J ■■■■■■if '■r ****^1W LviH m£££m r ^^jl ■tr yv^f«l K^^B LATE CENOZOIC GASTROPODS 15 Type locality: Campus of University of Illinois, Urbana, Champaign County, Illi- nois; marls exposed in excavations for foot- ings for south greenhouse. Collector: T. E. Savage. Age designation: Early Wisconsin marl. Remarks: Paratypes, no. Z10773, are cat- alogued in the ISGS collection but the speci- mens have not been found. Many other lots, labeled Gyraulus urbanensis, are in the ISGS collection. Planorbula indianensis Baker, 1930 Plate 3, figures 4-6 Holotype: Cat. no. P2833, ISGS. Original description: Trans. Illinois Acad. Sei., v. 22, p. 430, 1930. "Sangamon interval (Montgomery, Ful- ton, Iroquois counties) ; Late Wisconsin time (Chicago deposits, Cool [sic for Cook] Co.). This recently distinguished species is appar- ently extinct, nothing approaching it hav- ing been seen from the recent fauna. It re- sembles armigera but is larger, with a greater axial height and five full whorls. In size it is between armigera and Dall's chrystyi, a re- cent species of northern distribution. This species has six full whorls and is different from indianensis. The absence of indian- ensis from deposits between Sangamon and Early Wisconsin, and from the earlier Yar- mouth interval is noteworthy. The type lo- cality is in a deposit near Mt. Vernon, In- diana, beneath a terrace believed to be of Early Wisconsin age. It is thus either Pe- orian or Sangamon in age. In a deposit in Iroquois County, the fossil species from San- gamon strata is indianensis, while the spe- cies living near Sugar Creek at the present time is armigera." Height, 3.4; diameter, 8.8; height of ap- erture, 3.2; diameter, 3.1 mm. Holotype. (Measurements mine.) Type locality : Uniontown Road, two miles southwest of Mt. Vernon, Posey County, Indiana. Collector: Charles V. Theis, date un- known. Age designation: Pleistocene, Early Wis- consin. Remarks: Three paratypes from the type locality, no. P2833A, are in the ISGS collec- tion, together with a few other lots from various localities. The species is not com- mon in the State. PLATE 4 Fig. Fig. Fig. Fig. Figs. Figs. Figs. Figs. Figs. Figs. Figs. 1. Valvata sincera illinoisensis Baker, holotype, cat. no. P1671A, ISGA; west end Crystal Lake, Mc- Henry County, Illinois. Enlarged 7.4 times. 2. Valvata lewisii precursor Baker, holotype, cat. no. P2360, ISGS; 2% miles south and 1 mile west of Lewistown, Fulton County, Illinois. Enlarged 4.4 times. 3. Valvata tricarinata supracarinata Baker, holotype, cat. no. P928, ISGS; near Morris, Grundy County, Illinois. Enlarged 4.3 times. 4. Bulimus tentaculatus magnalacustris Baker, paratype, cat. no. P2819, ISGS; southwest corner Michi- gan Boulevard and Walton Place, Chicago, Cook County, Illinois. Enlarged 2.5 times. 5. 6, 7. Polygyra multilineata altonensis Baker, holotype, cat. no. P740A, ISGS; spiral, basal, and apertural views, respectively; Plant no. 2, Mississippi Lime and Materials Company, Alton, Madison County, Illinois. Enlarged 0.9 times. 8, 9, 10. Polygyra appressa hubrichti Baker, holotype, cat. no. P6629, ISGS; spiral, basal, and apertural views, respectively; Valmeyer, Monroe County, Illinois. Enlarged 1.1 times. 11, 12, 13. Polygyra profunda pleistocenica Baker, holotype, cat. no. P751, ISGS; spiral, basal, and apertural views, respectively; near corner East Sixth and Market Streets, Alton, Madison County, Illinois. Enlarged 1.3 times. 14, 15, 16. Stenotrema hubrichti Pilsbry, paratype, cat. no. P5137, ISGS; spiral, basal, and apertural views, respectively; just south of McCann School, 2 miles northeast of Aldridge, Union County, Illinois. Enlarged 2.4 times. 17, 18, 19. Polygyra multilineata wanlessi Baker, holotype, cat. no. P2358, ISGS; spiral, basal, and apertural views, respectively; 4 miles west of bridge at Havana, in Fulton County, Illinois. Enlarged 0.9 times. 20, 21, 22. Polygyra monodon peoriensis Baker, holotype, cat. no. P1910A, ISGS; spiral, basal, and apertural views, respectively; North municipal quarry, near Quincy, Adams County, Illinois. En- larged 2.6 times. 23, 24, 25. Polygyra hirsuta yarmouthensis Baker, holotype, cat. no. P2085, ISGS; spiral, basal, and apertural views, respectively; 3 miles southwest of Marshall, Clark County, Illinois. Enlarged 2.4 times. 16 ILLINOIS STATE GEOLOGICAL SURVEY I am not certain that the paragraph quoted above is the original description, but I have found no other diagnosis of P. indian- ensis in any of Baker's writings known to me. Polygyra appressa hubrichti Baker, 1937 Triodopsis fosteri hubrichti (Baker) Plate 4, figures 8-10 Holotype: Cat. no. P6629, ISGS. Original description: Nautilus, v. 51, p. 23, July 1937. "Shell differing from typical appressa [=Triodopsis fosteri missouriensis Pilsbry] in its much greater size, more elevated spire, rounder aperture, and generally gibbous form. The parietal lamella is long, curved, and extends to the umbilical region as in the typical form. Basal tooth of peristome usu- ally well developed, but the upper denticle of race fosteri rarely developed. Sculpture of fine lines of growth." Diameter, 25.5; height, 14.5; aperture diameter, 10.0; height, 7.0 mm. Holotype. (Baker's measurements.) Type locality: Valmeyer, Monroe Coun- ty, Illinois. Collector: Leslie Hubricht, 1 April 1932. Age designation: Pleistocene, Sangamon loess. Remarks: Two paratypic examples, no. P6630 and no. P6631, ISGS; other para- types: no. 168631, ANSP, and no. A-1562 in the collection of Leslie Hubricht. Other lots, from various localities, are in the ISGS collection. Polygyra hirsuta yarmouthensis Baker, 1927 Stenotrema hirsuta yarmouthensis (Baker) Plate 4, figures 23-25 Holotype: Cat. no. P2085, ISGS. Original description: Nautilus, v. 40, p. 115, April 1927. "Shell differing from recent hirsuta in be- ing uniformly smaller, with a straight pari- etal lamina which is shorter than in the typ- ical form, the denticle on the peristome is smaller, the base of the shell not usually as convex, and the basal callus is not as heavy.'' Height, 4.2; diameter, 6.6 mm. Type. (Baker's measurements.) Type locality: Three miles southwest of Marshall, Clark County, Illinois. Collector: Paul MacClintock, 30 August 1925. Age designation: Pleistocene, Yarmouth loess. Remarks: A single paratype, bearing the same number as the type, is in the ISGS col- lection, together with other lots identified by Baker; paratypes no. 142707 are in the ANSP collection. Polygyra monodon peoriensis Baker, 1927 Stenotrema leai peoriensis (Baker) Plate 4, figures 20-22 Holotype: Cat. no. P1910A, ISGS. Original description: Nautilus, v. 40, p. 116, April 1927. "Shell differing from typical monodon in being smaller, with a smaller umbilical open- ing, a less elevated parietal lamina which is usually joined to the basal lip near the col- umella by a more or less well-developed cal- lus." Height, 3.9; diameter, 6.1 mm. Type. (Baker's measurements.) Type locality: North municipal quarry, near Quincy, Adams County, Illinois, from loess 15 feet above bedrock. Collector: M. M. Leighton and Ben B. Cox, 1923. Age designation: Pleistocene, Peorian loess. Remarks: Eight paratypical specimens, no. P1910, and many other lots identified by Baker are in the ISGS collection; other par- atypes, no. 142708, ANSP. Polygyra multilineata altonensis Baker, 1920 Triodopsis multilineata altonensis (Baker) Plate 4, figures 5-7 Holotype: Cat. no. P740A, ISGS. Original description: Nautilus, v. 34, p. 65, October 1920. LATE CENOZOIC GASTROPODS 17 "Shell differing from typical multiline at a in being larger, the whorls more gibbous, the spire more depressed, and the sutures be tween the later whorls more deeply im- pressed ; the last whorl begins to rapidly de- scend on the previous whorl until the upper part of the outer lip rests against the periph- ery, instead of above this point, as in multi- lineata; the deflection of the upper part of the whorl toward the aperture is also more abrupt, and forms a distinct shoulder at this point; the reflected lip is much heavier as is also the umbilical callus; the spiral color bands and lines are apparently much less numerous than in typical multiline ata. "Greatest diameter, 32; height, 19.5; ap- erture height, 14; breadth, 14 mm. Holo- type." Type locality: Lower 10 feet of pink loess above quarry, Plant no. 2, Mississippi Lime and Materials Co., Alton, Madison County, Illinois. Collector: M. M. Leighton, April 1920. Age designation: Pleistocene, Sangamon in- terval. Remarks: Paratypes (no. P740B) and a few other lots are in the ISGS collection; this large variation of T. multilineata does not occur commonly in the Pleistocene of Illinois. POLYGYRA MULTILINEATA WANLESSI Baker, 1928 Triodopsis multilineata wanlessi (Baker) Plate 4, figures 17-19 Holotype: Cat. no. P2358, ISGS. Original description: Nautilus, v. 41, p. 132, April 1928. "Shell differing from recent multilineata in being smaller, the body whorl somewhat gibbous, of greater diameter as compared with height, the aperture somewhat nar- rower, and the base flattened and indented about the umbilical region, which may be narrowly perforate or completely closed. It may be distinguished from variety algon- quinensis Nason, by its usually larger size, more gibbous whorls, especially the body whorl, and the deeper indentation of the um- bilical region. There are faint indications of color lines or stripes on a few specimens, but the majority were probably unicolored as are some specimens of multilineata at the present time. Adults are usually imperforate, but immature shells appear to be always umbilicated. "Height, 13.5; diameter, 21.5 mm. Holo- type." Type locality: About four miles west of bridge at Havana, in Fulton County, Illinois. Collector: H. R. Wanless, summer, 1927. Age designation: Pleistocene, Yarmouth loess. Remarks: Three paratypes, bearing the same number as the type, and from the type locality, are in the ISGS collection; other paratypes, no. 144921, ANSP. POLYGYRA PROFUNDA PLEISTOCENICA Baker, 1920 Allogona profunda pleistocenica (Baker) Plate 4, figures 11-13 Holotype: Cat. no. P751, ISGS. Original description: Nautilus, v. 34, p. 66, October 1920. "Shell uniformly smaller than typical pro- funda, more solid, with slightly higher spire and proportionally smaller aperture and um- bilicus; the color bands are developed in but two specimens of the 19 specimens exam- ined, the majority of the individuals being unicolored. "Greatest diameter, 22; height, 14.7 mm. Holotype." Type locality: Pink loess, near corner East Sixth and Market Streets, Alton, Madi- son County, Illinois. Collector: M. M. Leighton, April 1920. Age designation: Pleistocene, Sangamon loess. Remarks: The ISGS collection contains two paratypical examples, no. P751B, and many other lots from deposits designated Yarmouth to Early Wisconsin, referred by Baker to this subspecies. Pomatiopsis scalaris Baker, 1927 Plate 1, figure 7 Holotype: Cat. no. P2321, ISGS. 18 ILLINOIS STATE GEOLOGICAL SURVEY Original description: Nautilus, v. 40, p. 120, April 1927. "Shell elongated, turreted, scalariform ; spire long, scalar; sutures deeply impressed; whorls about 8, very convex, the body whorl disproportionately larger than the preceding whorl; umbicilus round, wide, deep; aper- ture roundly oval, peristome thin, continu- ous, the inner lip forming a rounded, erect border near the umbilicus." Length, 7.8; diameter, 3.5; aperture length, 2.1; diameter, 1.6 mm. Type. (Bak- er's measurements.) Type locality: New Harmony, Posey County, Indiana. Collector: L. E. Daniels; from A. A. Hinkley collection. Age designation: Pleistocene, Peorian loess. Remarks: The ISGS collection contains two paratypes from the type locality and bearing the same number as the type; other paratypes, no. 142713, ANSP. P. scalaris occurs widely in Pleistocene deposits of Illi- nois. Stenotrema hubrichti Pilsbry, 1940 Plate 4, figures 14-16 Paratype: Cat. no. P5137, ISGS. Original description: Pilsbry, Land Mol- lusca North America, v. 1, pt. 2, p. 687, fig. 423, 1940. "The imperforate shell is depressed, lens- shaped, acutely carinate, the height not much exceeding half of the diameter. Spire low conic, of slowly increasing whorls, the first convex, the rest nearly flat, impressed above the keel; last whorl descending in front. The base is flattened below the keel, then convex, and slightly impressed around the central axis. The embryonic whorls are most minutely granulose. Later whorls are lightly striate, the striae low, very unequal. Base with fainter striae and densely, mi- nutely granulose. The aperture resembles that of S. fraternum but is narrower, the parietal tooth nearer to the basal lip, ap- proaching it slightly towards the outer end ; nearly straight, rather low, connecting with the end of the columellar lip by a low, curved ridge. The basal lip is reflected, rather strongly thickened within, the thickening narrowing at the passage of basal into col- umellar margin, forming a rounded sinus there; in the outer half of the basal margin it is wider, but narrows gradually at the po- sition of the keel, not abruptly as in S. bar- big erum." Height, 4.4 mm.; diameter, 9.9 mm.; 5Vi whorls. (Measurements mine.) Type locality: Pleistocene "talus" just south of McCann School, two miles north- east of Aldridge, Union County, Illinois. Collector: Leslie Hubricht. Age designation: Pleistocene. Remarks: The holotype and a series of paratypes, both numbered 174941, are in the ANSP collection. The shells in the ISGS collection are from a paratypical series from the private collection of Leslie Hubricht, no. A5137. This unusual species, described by Pilsbry from Pleistocene loess deposits in Illinois, is included for the sake of completing the list of types of late Cenozoic mollusks in the ISGS collections. Strobilops sparsicostata Baker, 1938 Plate 1, figures 4-6 Holotype: Cat. no. P6774, ISGS. Original description: Nautilus, v. 51, p. 127, April 1938. "Shell broadly conic with somewhat ele- vated, dome-shaped spire. Whorls 5i/2> the first 1% smooth, the balance sculptured with distinct ribs, widely spaced, with frequently a faint riblet between. The umbilicus is contained about seven times in the diameter of the shell. Last whorl decidedly angular, the base of the shell smooth or with occa- sional faint riblets extending over it from the dorsal surface. Aperture with expanded, thickened peristome and a heavy palatal callus. There is a very heavy parietal lamella emerging from the edge of the callus and a weak infraparietal lamella which emerges within the aperture almost to the parietal callus in some specimens. This is often not developed outside of the aperture. The pari- LATE CENOZOIC GASTROPODS 19 etal lamella penetrates within the aperture more than three-fourths of a whorl. Half a whorl within the aperture there is a short, stout lamella on the axis. There are five baso-parietal folds, the first two basal folds are large and heavy, the first kidney-shaped, the second larger and lamellar, erect. The other three folds are low, rather long and curved. All basal folds are arranged radially. Height, 2.0; diameter, 2.7 mm. Holotype." Type locality: Rexroad Ranch, SWV4 sec. 22, T. 33 S., R. 29 W., Meade County, Kansas. Collector: C. W. Hibbard and party, sum- mer, 1937. Age designation: Pleistocene, late Nebras- kan in Blanco formation. Remarks: Fifty paratypes, from the type locality and bearing the same number as the holotype, are in the ISGS collection; other paratypes, no. 169886, ANSP. This species is a common fossil in Nebraskan and Kansan deposits in the central Great Plains region. Succinea grosvenorii gelida Baker, 1927 Plate 1, figure 13 Holotype: Cat. no. P875A, ISGS. Original description: Nautilus, v. 40, p. 118, April 1927. "Shell small, elongated, rather narrow; whorls 3% convex, separated by deep su- tures, last whorl comparatively small, flat- sided, or but slightly convex; spire long, acute; aperture rounded, about half as long as shell; columella straight curving into the parietal wall in a gentle curve, not forming a distinct angle ; there is a slight callus which is spread over the parietal wall; sculpture of rather fine, vertical striae." Length, 8.0; diameter, 4.2; aperture length, 4.0; diameter, 2.4 mm. Type. (Bak- er's measurements.) Type locality: One-half mile northwest of railway depot, Irene, Boone County, Illi- nois. Collector: M. M. Leighton, 1920. Age designation: Pleistocene, Peorian loess. Remarks: Three paratypes from the type locality are in the ISGS collection; other paratypes, no. 142712, ANSP. Shells iden- tified by Baker as S. g. gelida occur commonly in the loesses of Illinois. Succinea ovalis pleistocenica Baker, 1927 Plate 1, figure 11 Holotype: Cat. no. P2088A, ISGS. Original description: Nautilus, v. 40, p. 117, April 1927. "Shells differing from typical ovalis in having a rounder aperture and compara- tively longer spire; it averages somewhat smaller than the ovalis now living in Illi- nois." Length, 19.0; diameter, 11.5; aperture length, 11.5; aperture diameter, 8.0 mm. Holotype. (Baker's measurements.) Type locality: Three miles southwest of Marshall, Clark County, Illinois. Collector: Paul MacClintock, 30 August 1925. Age designation: Pleistocene, Yarmouth loess. Remarks: The ISGS collection contains four paratypical specimens, no. P2088A, from the type locality; other paratypes, no. 142710, ANSP. The ISGS collection contains nu- merous lots from Pleistocene deposits of Illi- nois, identified by Baker as S. 0. pleistocenica. Succinea retusa fultonensis Baker, 1928 Oxyloma decampi fultonensis (Baker) Plate 1, figure 12 Holotype: Cat. no. P2368, ISGS. Original description: Nautilus, v. 41, p. 136, April 1928. "Shell elongately ovate, compressed, spire long, conic, sutures well impressed ; whorls three, somewhat oblique, narrow, the second whorl much swollen as compared with the first whorl which appears above the second whorl as a small knob; aperture narrow, ovate, narrowed above, widely rounded be- low; columella somewhat incurved. 20 ILLINOIS STATE GEOLOGICAL SURVEY "Height, 8.1; diameter, 4.0; aperture height, 5.0; diameter, 2.8 mm. Holotype." Type locality: Two and 1/4 miles west and % miles south of Lewistown, Fulton County, Illinois. Collector: H. R. Wanless, summer, 1927. Age designation: Pleistocene, Early Wis- consin, gray silts. Remarks: Two paratypes from the type locality, and bearing the same number as the holotype, are in the ISGS collection; other paratypes, no. 145109, ANSP. Other lots are found in the ISGS collection, but the snail is not common in Pleistocene deposits of Illinois. Valvata lewisii precursor Baker, 1928 Plate 4, figure 2 Holotype: Cat. no. P2360, ISGS. Original description: Nautilus, v. 41, p. 136-137, April 1922. "Shell somewhat larger than lewisii, spire elevated, scalariform, the sutures deeply im- pressed, the whorls notably rounded and set one above another in turban fashion; whorls rather more than four with four full coils visible in front view, the upper two whorls projecting well above each other; the body whorl high, increasing in diameter as it ap- proaches the aperture ; umbilicus wide, deep ; aperture large, rounded, entire, the inner lip only touching the parietal wall; sculp- ture of rather distinct, longitudinal lines of growth resembling tightly wound thread. "Height, 4.3 ; diameter, 5.0 mm. Holo- type." Type locality: Two and % miles south, one mile west of Lewistown, Fulton County, Illinois. Collector: H. R. Wanless, summer, 1927. Age designation: Pleistocene, Early Wis- consin, upper gray silts. Remarks: The ISGS collection contains paratypes from the type locality, no. P2360, and several lots from various localities iden- tified by Baker as V . I. precursor. The sub- species is not common in Pleistocene deposits in Illinois. Paratypes no. 144923, ANSP. Valvata sincera illinoisensis Baker, 1929 Plate 4, figure 1 Holotype: Cat. no. P1671A, ISGS. Original description: Trans. Illinois Acad. Sci., v. 22, p. 189, figure 1, 1929. "In the Mollusca of Wisconsin a form of Valvata was referred to sincera danielsi Walker. The receipt of a large collection of Pleistocene fossils from the Illinois Geo- logical Survey indicates that this reference was erroneous. The fossil form is about half the size of danielsi and is apparently wholly extinct. It is a common species in the Pleis- tocene of Illinois and occurs more rarely in Late Wisconsin deposits in Wisconsin. The type locality is near the west end of Crystal Lake, McHenry County, Illinois, in a marl deposit of Late Wisconsin age. This variety does not occur in the Chicago deposits. It is probably the ancestor of both sincera and danielsi, but is nearer sincera." Length, 2.7 ; diameter, 2.0 ; length of aper- ture, 1.2; diameter of aperture, 1.1 mm. (Measurements are mine; Baker gave no measurements.) Type locality: West end Crystal Lake, McHenry County, Illinois, in marl deposit. Collector: M. M. Leighton and E. P. Rothrock, 10 August 1922. Age designation: Pleistocene. Remarks: Three paratypes from the type locality and bearing the same number as the holotype, are in the ISGS collection; other lots from Illinois are not numerous. In the original description, Baker used the heading "new variety," but the figures that accompany the description are labeled Val- vata illinoisensis. As it seemed to be Baker's intention to describe this fossil as a subspe- cies of Valvata sincera, it seems best, for the present at least, to regard illinoisensis as a subspecific name. Valvata tricarinata supracarinata Baker, 1921 Plate 4, figure 3 Holotype: Cat. no. P928, ISGS. LATE CENOZOIC GASTROPODS 21 Original description: Nautilus, v. 35, p. 24, July 1921. "Shell differing from the other described varieties of the tricarinate series in lacking the carina on the periphery and base. Other- wise similar. "Length, 3.5; width, 4.5; aperture length, 2.0; width, 1.8 mm. Topotype." Type locality: Near Morris, Grundy County, Illinois. Collector: H. E. Culver, 1921. Age designation: Pleistocene, Late Wis- consin. Remarks: Three paratypes, no. P929, are in the ISGS collection. Vertigo gouldii loessensis Baker, 1928 Vertigo elatior loessensis (Baker) Plate 1, figure 2 Holotype: Cat. no. P2366, ISGS. Original description: Nautilus, v. 41, p. 135, April 1928. "Shell differing from recent gouldii in be- ing more ventricose, especially on the last whorl, having the apical whorls wider and more obtuse, the outer lip more auricled caus- ing the aperture to have its longest diameter more diagonal than in gouldii. There are five denticles placed as in gouldii, but more delicate than in the typical form; the palatal denticles are long and subequal. "Length 2.0; diameter 1.3 mm. Holo- type." Type locality: Three and a half miles west and one and three-quarters miles south of Lewistown, Fulton County, Illinois. Collector: H. R. Wanless, summer, 1927. Age designation: Pleistocene, Peorian loess. Remarks: Two paratypes from the type locality, no. P2366, are in the ISGS col- lection; other paratypes, no. 145107, ANSP. The ISGS collection contains numerous lots from widespread localities in Illinois. Vertigo hibbardi Baker, 1938 Plate 1, figure 3 Holotype: Cat. no. P6773, ISGS. Original description: Nautilus, v. 51, p. 126, April 1938. "The shell has 5 whorls and is very ven- tricose over the body whorl. The sutures are impressed, the apex is obtuse and bluntly rounded. There is a conspicuous crest behind the outer lip, behind which are two pits showing the position of the palatal laminae. The body whorl is flattened laterally and the base of the shell is trumpet-shaped when viewed from below. Base subumbilicate. Ap- erture more than half the length of the last whorl, the lips expanding outward. Outer lip biarcuate. Lamella and plications 7 in number. The angular and parietal lamellae are long and extend some distance within the aperture, the angular emerging further than the parietal, the parietal curving spirally in- ward toward the left. Columella or lamella large and conspicuous, curving backward to- ward the base of the shell. The lower palatal fold is stout, nearly straight and somewhat flattened on top. The upper palatal is stout, high and lamellar and curves downward to- ward the lower palatal. Both palatal folds rest in front on a rounded callus and they ter- minate abruptly at an equal distance within the aperture and both increase in height as they extend backward. There is a strong, curved basal fold and a strong tubercular suprapalatal fold. "Length 1.9; diameter 1.2 mm. Holo- type." Type locality: Rexroad Ranch, SW1/^ sec. 22, T. 33 S., R. 29 W., Meade County, Kansas. Collector: C. W. Hibbard and party, sum- mer, 1937. Age designation: Pleistocene, Late Ne- braskan, Blanco formation. Remarks: The ISGS collection contains a series of paratypes, no. P6773A; other paratypes, no. 169883, ANSP. 22 ILLINOIS STATE GEOLOGICAL SURVEY SELECTED BIBLIOGRAPHY The following papers by Frank Collins Baker deal principally with fossil gastropods: 1900. Notes on a collection of Pleistocene shells from Milwaukee, Wisconsin: Jour. Cincinnati Soc. Nat. Hist., v. 19, no. 5, p. 175-177. 1902. The Mollusca of the Chicago area, pt. II, Gastropods: Chicago Acad. Sci. Bull., v. 3, p. 131-410. 1903. Pleistocene mollusks of White Pond, New Jersey: Nautilus, v. 17, no. 4, p. 38-39. 1906. A catalogue of the Mollusca of Illinois: Illi- nois State Lab. of Nat. Hist. Bull. 7, p. 53- 106. 1909. Description of a new fossil Lymnaea: Nautilus, v. 23, no. 1, p. 19-21. 1910. Preliminary note on the life of glacial Lake Chicago: Science, n.s., v. 31, no. 801, p. 715— 717. 1911. The Lymnaeidae of North and Middle Amer- ica, recent and fossil: Chicago Acad. Sci. Special Publ. III. 1912. Post-glacial life of Wilmette Bay, glacial Lake Chicago: Trans. Illinois Acad. Sci., v. 4, p. 108-116. 1913. Interglacial records in New York: Science, n.s., v. 37, no. 953, p. 523-524. 1913. Notes on post-glacial Mollusca, I, Emmet County, Michigan: Nautilus, v. 27, no. 1, p. 7-8. 1913. Notes on post-glacial Mollusca, II, Waukesha County, Wisconsin: Nautilus, v. 27, no. 6, p. 68. 1913. Interglacial mollusks from South Dakota: Science, n.s., v. 38, no. 989, p. 858-859. 1915. Pleistocene mollusks from Illinois: Nautilus, v. 29, no. 8, p. 87-88. 1916. Further notes on the post-glacial biota of glacial Lake Chicago: Trans. Illinois Acad. Sci., v. 7, p. 74-78. 1918. Post-glacial Mollusca from the marls of cen- tral Illinois: Jour. Geol., v. 26, no. 7, p. 659- 671. 1919. Description of a new species and variety of Planorbis from post-glacial deposits: Nautilus, v. 32, no. 3, p. 94-97. 1920. A new form of Amnicola from the Ohio Pleistocene deposits with notes on a Physa from the same formation: Nautilus, v. 33, no. 4, p. 125-127. 1920. The life of the Pleistocene or glacial period: Univ. Illinois Bull. 17. 1920. Pleistocene Mollusca from Indiana and Ohio: Jour. Geology, v. 28, no. 5, p. 439-457. 1920. Animal life in loess deposits near Alton, Illi- nois, with descriptions of two new varieties of land shells from the same deposits: Nau- tilus, v. 34, no. 2, p. 61-68. 1921. New forms of Pleistocene Mollusks from Illi- nois: Nautilus, v. 35, no. 1, p. 22-24. 1922. Pleistocene Mollusca from northwestern and central Illinois: Jour. Geology, v. 30, no. 1, p. 43-62. 1923. The Pleistocene Mollusca from the vicinity of Joliet, Illinois: Trans. Illinois Acad. Sci., v. 15, p. 408-420. 1924. The variation and distribution, recent and fossil, of the snail Polygyra profunda Say in Illinois: American Midland Naturalist, v. 15, p. 178-186. 1926. New forms of Planorbis and Lymnaea with notes on other forms: Nautilus, v. 39, no. 4, p. 116-121. 1926. Bowmanville low-water stage of glacial Lake Chicago: Science, n.s., v. 64, no. 1654, p. 249. 1927. Descriptions of new forms of Pleistocene land mollusks from Illinois, with remarks on other species: Nautilus, v. 40, no. 4, p. 114-120. 1928. Description of new varieties of land and fresh- water mollusks from Pleistocene deposits in Illinois: Nautilus, v. 41, no. 4, p. 132-137. 1928. Molluscan life of the loess deposits of Illinois: Trans. Illinois Acad. Sci., v. 20, p. 269-292. 1928. The fresh-water Mollusca of Wisconsin, pt. I, Gastropoda: Wisconsin Geol. and Nat. Hist. Survey Bull. 70. 1929. A study of the Pleistocene Mollusca collected in 1927 from deposits in Fulton County, Illinois: Trans. Illinois Acad. Sci., v. 21, p. 288-312. 1929. Henderson, Junius. Some fossil fresh-water Mollusca from Washington and Oregon: Nau- tilus, v. 42, no. 4, p. 119-123. 1930. The molluscan fauna of the southern part of Lake Michigan and its relation to old glacial Lake Chicago: Trans. Illinois Acad. Sci., v. 22, p. 186-194. 1930. A new record of Castoroides ohioensis from Illinois: Science, n.s., v. 71, no. 1841, p. 389. 1930. A review of our present knowledge concerning the character and distribution of the Pleisto- cene aquatic molluscan life of Illinois: Trans. Illinois Acad. Sci., v. 22, p. 411-434. 1930. The variation of molluscan life during Pleisto- cene and Recent time: Nautilus, v. 44, no. 1, p. 21-24. 1930. Notes on Professor Shimek's paper on land snails as indicators of ecological conditions: Ecology, v. 11, no. 4, p. 788-789. 1931. Additional notes on animal life associated with the Mound Builders of Illinois: Trans. Illi- nois Acad. Sci., v. 23, p. 231-235. 1931. A restudy of the interglacial molluscan fauna of Toronto, Canada: Trans. Illinois Acad. Sci., v. 23, p. 358-366. 1931. Pulmonate Mollusca peculiar to the Pleisto- cene period, particularly the loess: Jour. Pa- leontology, v. 5, no. 3, p. 270-292. 1931. Pleistocene history of the terrestrial Mollusca of Fulton County, Illinois: Trans. Illinois Acad. Sci., v. 24, p. 149-155. 1934. Description of a new species of Gyraulus: Canadian Field-Nat., v. 48, no. 2, p. 37. 1935. Stratigraphic sequence of molluscan fossils in loess deposits (abst.): Proc. Geol. Soc. America for 1934, p. 372-373. 1936. Quantitative examination of molluscan fossils in two sections of Pleistocene loess in Illinois: Jour. Paleontology, v. 10, no. 1, p. 72-76. 1937. A new Pleistocene race of Polygyra appressa: Nautilus, v. 51, no. 1, p. 23-24. LATE CENOZOIC GASTROPODS 23 1937. Pleistocene land and fresh-water Mollusca as indicators of time and ecological condi- tions: in Early Man, George Grant Mac- Curdy, ed., J. B. Lippincott Co., Philadelphia, p. 67-74. 1938. New land and fresh-water Mollusca from the upper Pliocene of Kansas and a new species of Gyraulus from early Pleistocene strata: Nau- tilus, v. 51, no. 4, p. 126-131. 1939. Fieldbook of Illinois land snails: Illinois Nat. Hist. Survey Manual 2. 1940. A new Helisoma from the Pliocene of Florida: Nautilus, v. 54, no. 1, p. 17. 1942. A new Gyraulus from the Pleistocene of Cali- fornia and a new Parapholyx from a supposed Pliocene deposit in Oregon: Nautilus, v. 55, no. 4, p. 130-132. 1943. Mollusca contained in the test pit deposits: Carnegie Inst. Washington Pub. 538, p. 117- 119. 1945. The molluscan family Planorbidae: Univ. Illinois Press, Urbana. Illinois State Geological Survey Report of Investigations 201 24 p., 4 pis., 1957