Ca)

ve
pt H REPORT

OF THE

@ CANADIAN ARCTIC EXPEDITION
1913-18

VOLUME VII: CRUSTACEA

PART H: CLADOCERA

By CHANCEY JUDAY.

SOUTHERN PARTY—1913-16

& OTTAWA

THOMAS, MULVEY
PRINTER TO THE KING’S MOST EXCELLENT MAJESTY
1920

Issued June 23, 1920.

wigan

«

_Report of the Canadian Arctic Expedition 1913-18,

VOLUME VII: CRUSTACEA.

Part A: DECAPOD CRUSTACEANS. By Mary J. Rathbun..... AT ssued August 18, 1919).
Part B: SCHIZOPOD CRUSTACEANS. By Waldo L. Schmitt. (Issued September 22, 1919).
Part C: CUMACEA. By W.T. Calman.......0..0. 000000000. AR ecuieabes cases (In press).
Part D: ISOPODA. By Miss P. L. Boone..............2..0-005 Sapasiod suai anbacae (In press).
Part E: AMPHIPODA. By Clarence R..Shoemaker......... iimiiee gus NAA eRE NY (In press).
Part F: PYCNOGONIDA. Leon J. Cole.............. Sicha Sloe GRAS (In press).
Part G: EUPHYLLOPODA. By F. Johansen....... Dretiotat nett dha dl arat Miche (In preparation).
Part H:CLADOCERA. By Chancey Juday....... | Ren EN at EOE NTE (In press).
Part I: OSTRACODA. By R. W.Sharpe.......... 0.0. 0e ccc e cece eee eee (In preparation).
‘Part J: FRESHWATER COPEPODA. By C. Dwight Marsh.,.....(Issued April 21, 1920).
Part K: MARINE COPEPODA. By A. Willey.......... erate -. (Issued June 25, 1920).
Part L: PARASITIC COPEPODA. By Charles B. Wilson................ oor dn press).

Part M: CIRRIPEDIA. By H. A. Pilsbry.........0....0 0c ccc cceeeveees (In preparation).

REPORT

OF THE

CANADIAN ARCTIC EXPEDITION
1913-18

VOLUME VII: CRUSTACEA

PART H: CLADOCERA

By CHANCEY JUDAY.

SOUTHERN PARTY—1913-16

OTTAWA
THOMAS MULVEY
PRINTER TO THE KING'S MOST EXCELLENT MAJESTY
1920

79805 Issued June 23, 1920.

Cornell University

The original of this book is in
the Cornell University Library.

There are no known copyright restrictions in
the United States on the use of the text.

http://www.archive.org/details/cu31924074095336

The Cladocera of the Canadian Arctic Expedition, 1913-18.
By Cuancry Jupay.
Wisconsin Geological and N atural History Survey.

The plankton collections secured by Mr. F. Johansen during the anaes
Arctic Expedition are of particular interest from the standpoint ‘of the geo-:
graphical distribution of the Cladocera because they were obtained from a
region in which collections had not been made previously. These entomostraca
had been collected in Greenland and in Labrador on the east and in Alaska on’
the west, but the intervening region of Arctic North America was represented
only by a single small collection; some freshwater plankton was collected at
Fullerton, Northwest Territory, on the west side of Hudson bay, during the
Neptune Expedition of 1903-4 and this material contained a single cladoceran,
namely, Daphnia pulex (de Geer).

‘The present collections contain representatives of seven'species of fresh
water and two species of marine Cladocera. ‘All of these species are well known
and they, have a wide range geographically; with one exception they are widely
distributed not only in high Arctic latitudes but also in the north ‘temperate
zone. Eurycercus glacialis, as far as known, is confined to the Arctic regions.

The United States National Museum kindly loaned its collection of American
Arctic Cladocera, and the two species of Daphnia represented therein have been
included in this report.

FRESH WATER CLADOCERA.
Daphnia pulex (de Geer).

This species is cosmopolitan and circumpolar in its distribution. There are
several varieties, at least two of which are represented in these collections.
According to Lilljeborg, the species shows seasonal variations in its form, and the
same appears to be true of this Canadian material.

The typical form of this species is most abundant i in the collections. Speci-
mens of the animal or of its ephippia were noted as follows:—

1. August 6, 1913. Teller (Port Clarence), Alaska. Ponds .on higher.
tundra between big lake and sea. Few, various sizes.

2. June 4, 1914. Collinson point, Alaska. Waterhole on tundra.
Ephippia.

‘3, June 25-26, 1914. Konganevik (Camden bay), Alaska. Margin of big
lake among vegetation. ‘Ephippia.

4. July 11, 1914. Collinson point, Alaska. In waterhole at beach, no
vegetation. Temperature of water at 6 p.m., 58° F. Young, just hatched.

' 5, July 26, 1914. Martin point, Alaska. Big brackish lagoon about one-
half foot deep, no vegetation. Temperature of water at 10 a.m., 51° F. Many,
all. sizes from newly hatched to full grown with parthenogenetic eggs.

“6. August 14, 1914. Herschel island, Yukon Territory. -Pond’on north-
east. end of island. Abundant, some with ephippia: or winter eggs.

“7, June 25, 1915. Bernard harbour, Northwest Territories. Tales and
ponds on tundra, inland. Much vegetation. Many ephippia.

8. July 8, 1915. Locality, etc. as preceding. Young and ephippia.

9. July 15, 1915. Bernard harbour, Northwest Territories. Brackish
pond: near creek outlet. Large numbers of young, but none quite full grown.
Enormous numbers of ephippia attached to filaments of algae.

10. July 19, 1915. Bernard harbour, Northwest. Territories. . Brackish
pond near creek outlet. Many. ;

45 Canadian Arctic Expedition, 1918-1918

11. August 4, 1915. Bernard harbour, Northwest Territories. Brackish
pond near creek outlet. Females with ephippia and many cast ephippia.

12. August 10, 1915. Bernard harbour, Northwest Territories. Lake.
Females with ephippia.

13. September 23, 1915. Bernard harbour, Northwest Territories. Brack-
ish pond near creek outlet. Ice one foot, water three to four feet. Ephippia.

14. October 6, 1915. Bernard harbour, Northwest Territories. Tundra
ponds on top of ridge southeast of harbour. Depth of water about. one foot.
Temperature of water 33° F. A few specimens.

15. May 25, 1916. Bernard harbour, Northwest Territories. Brackish
pond near creek outlet. Ephippia.

“16. June 17, 1916. Bernard harbour, Northwest Territories. Pond on
south side of Chantry island. Temperature of water 50° F. Young (just hatched)
and ephippia. : :

17. June 20 and 30, 1916. Bernard harbour, Northwest Territories.
Brackish pond near creek outlet. Young and ephippia.

18. July 3, 1916. Bernard harbour, Northwest Territories. Tundra ponds
(see fig. 4) on ridge southwest of harbour. Temperature of water 55° F.
Common, immature.

19. July 10, 1916. Bernard harbour, Northwest Territories. Brackish
pond. Females carrying parthenogenetic eggs.

20. July 26, 1916. Cape Bathurst, Northwest Territories. Waterhole in
brook-swamp on tundra. Much vegetation. Abundant, various sizes.

21. July 30, 1916. Herschel island, Yukon Territory. Pond on south
end of island. Elevation about 100 feet. Many individuals of different sizes.

The specimens in the various catches seem to show that the ephippia or
winter eggs begin to hatch in June, most of them probably hatching during the
latter half of this month; females bearing parthenogenetic or summer eggs
appear about the first week in July, while the males and ephippial females make
their appearance in late July and in August. The season, therefore, is a rela-
tively short one.

The material from the United States National Museum contained Daphnia
pulex typica from Battle harbour, Labrador; from Point Barrow, Alaska, col-
lected in July, 1882; and from Polaris bay, Greenland, collected by the United
States North Polar Expedition on August 1, 1872. The material from Polaris
bay consists of several hundred specimens, the great majority being females
with ephippia. Polaris bay is located in about 82° N. latitude, which seems to
be the most northerly record, so far, for any of the Cladocera. In the north
this form has also been reported from Spitzbergen, Nova Zembla, Fullerton on
west side of Hudson bay, and St. Paul island, Bering Sea. In the southern
hemisphere it has been found as far south as the Falkland islands and Tierra
del Fuego (Ekman).

A few specimens of D. pulex forma aestivalis Lilljeborg were noted in a catch
obtained from a brackish pond between a big lake and the sea at Teller (Port
Clarence), Alaska, on August 3, 1913.

Three specimens of D. pulex var. middendorffiana Fischer were found in a
catch from a pond on the east end of Herschel island, Yukon Territory, taken
on August 14, 1914. All were females carrying parthenogenetic eggs. This
variety has also been noted in northern Europe, in Siberia, and in the New
Siberian islands.

Daphnia longispina O. F. Mueller.

A few specimens of D. longispina typica were present in a catch obtained
from ponds on higher tundra in the vicinity of Teller (Port Clarence), Alaska,
on August 6, 1913. Different sizes were noted.

One bottle in the United States National Museum contained typical speci-
mens of this species collected on Bering island in 1882.

Cladocera 5B
Daphnia longispina var. hyalina forma arctica nova forma.

Six plankton catches (vertical hauls) obtained from big lake (see fig. 3) at
Bernard harbour, Northwest Territories, between September 30, 1915, and June
12, 1916, contain a diminutive form of the variety hyalina which is characterized
chiefly by its small size. The crest of this form is small and regularly rounded
so that the eye is situated near the anterior margin and only a little below the
middle of the head. The ventral margin of the head is slightly concave and the
dorsal margin of the shell shows a slight concavity just above the heart. (See
figures 1 and 2.)

Fia. 1.—Daphnia longispina var. hyalina forma arctica nov. forma.
Big Lake, Bernard harbour, Northwest Territories,
September 30, 1915. Length, exclusive of spine, 0.97
mm.

The egg-bearing females obtained in September range in length from 0-9
mm. to 1-0 mm., exclusive of the spine, while the February specimens vary
from 0-7 mm. to a little more than 0-8 mm. The spine is from a half to two-
thirds as long as the body. No ephippial females were noted in any of the
catches from this lake, but six of the samples contained parthenogenetic
females; the majority of the latter carried only two eggs while a few bore as
many as three, and others only one. Wesenberg-Lund also found that the
parthenogenetic females of Daphnia longispina belonging to the microcephala-
galeata group, in plankton material from Thingvallavatn lake, Iceland, carried
but two or three eggs.

Fie. 2,—Daphnia longispina var, hyalina forma, arctica. Big
Lake, Bernard harbour, Northwest Territories,
February 12, 1916. Length, exclusive of spine,
0.77 mm.

Egg-bearing females were noted in catches obtained from the lake at
Bernard harbour on the following dates —

1. September 30, 1915. Ice eight inches, depth of water 19 feet. Many.

2. November 28, 1915. Ice about two feet. Temperature of water at
surface 32° F., below surface 32-5°. Few.

3. February 12, 1916. Ice 5-5 feet, depth of water 20 feet. Temperature
of water at surface 32° F., air 20°. Few.

65 Canadian Arctic Expedition, 1913°18.

4. February 18, 1916. Ice 6 feet. Common. ;

5. May 6, 1916. Ice 7 feet. Temperature of surface water 32-5° F.
Few. Young ones emerging from mother-animals.

6. May 21,1916. Temperature of surface water 33° F. Young and adults,
young in upper water, and older ones between 12 feet and 20 feet.

7. June 12, 1916. Ice 6 feet. Temperature of surface water 33° F., air
38°. Young and adults common:

Bosmina longirostris (O. F. Mueller).
This species appeared only in the material collected in the two big lakes

(see fig. 3) at Bernard harbour, Northwest Territories. It was obtained on the
following dates:—

F. Johansen, photo.
Fig. 3.—Big lake at Bernard Harbour, Northwest Territories, August, 1915.

1. September 26, 1915. Ice 7-5 inches, depth of the water 9 feet. One
female.

2. September 30, 1915. Ice 8 inches, depth of water 19 feet. Common,
about a quarter of the specimens with embryos in brood chamber.

3. November 28, 1915. Ice about two feet. Temperature of the water at
surface 32° F., below "surface 32-5°. Few.

4, February 12,1916. Ice 5-5 feet, depth of water 20 feet. Temperature of
the water at surface 32° F. Very few.

5. June 12, 1916. Ice 6 feet. Temperature of surface water 33° F., air
38°. Few.

Eurycercus glacialis Lilljeborg.

This species is one of the largest forms among the Cladocera. Some indi-
viduals reach a length of 6 mm., but in most instances they do not exceed 5 mm.
As many as forty summer or parthenogenetic e eggs have been found in the brood
chambers of the larger females.

Several specimens 5 mm. long were noted in this material, but none exceeded
this length. This form appeared in five plankton samples :—

1. August 3,1913. Teller (Port Clarence), Alaska. Brackish pond between
big lake and sea. Abundant, various sizes, some full grown with summer eggs.

2. August 14, 1914. Herschel island, Yukon Territory. Pond on east
end of island. Elevation about 250 feet. Much vegetation. Several adults
5 mm. long as well as smaller individuals.

Cladocera 75

3. August 10, 1915. Bernard harbour, Northwest Territories. Lake on
tundra, Common, some females with ephippia. a

4. August 16, 1915. Bernard harbour, Northwest Territories. Tundra
ponds (see fig. 4) on top of ridge. Elevation about 100 feet. Various sizes,
common. |

5. July 26, 1916. Cape Bathurst, Northwest Territories. Waterhole in
brook-swamp on tundra. Much vegetation. Various sizes, few.

So far this species has been found only in high northern latitudes. It has
been reported from Nova Zembla, lake Enara in Finnish Lapland, Greenland,
Labrador, Bering island, and St. Paul island.

: F. Johansen, photo.
Fig. 4.—Pond on ridge at Bernard Harbour, Northwest Territories, July, 1916.

Alona guttata G. O. Sars.

Three mature females of this species were found in a plankton haul obtained
from tundra ponds (see fig. 4) on top of ridge southwest of Bernard: harbour,
Northwest Territories, on July 3, 1916. Elevation about 100 feet. Tempera-
ture of water 55° F.; air 50° at 3.30 p.m.

Chydorus sphaericus (0. F. Mueller).

This cosmopolitan form was noted in five samples of plankton as follows:—

1. August 3, 1913. Teller (Port Clarence), Alaska. Brackish pond between
big lake and sea. One specimen, a female. |

2. August 16, 1915. Bernard harbour, Northwest Territories. Tundra
ponds (see fig. 4) on top of ridge southwest of the harbour. Elevation about
100 feet. Collected at margin. One dark brown specimen.

3. September 23, 1915. Bernard harbour, Northwest Territories. Brack-
ish pond ne&r creek outlet. Ice 1 foot; water 3 to4 feet. Few.

4. July 3, 1916. Bernard harbour, Northwest Territories. Tundra ponds
(see fig. 4) on ridge southwest of the harbour. Temperature of water 55° F., air
50°. Few, some females with summer eggs.

5. July 26, 1916. Cape Bathurst, Northwest Territories. Waterhole in
brook-swamp on tundra. Much vegetation. Few.

This species is world wide in its distribution. In the north it has been
found in northern Europe and Asia, Nova Zembla, Spitzbergen, Greenland,
Newfoundland, and the New Siberian islands.

8E Canadian Arctic Expedition, 1913-18
Polyphemus pediculus (Linnaeus).

Many specimens of this species were found in a plankton catch taken in
tundra ponds (see fig. 4) on a ridge southwest of Bernard harbour, Northwest
Territories, on July 3, 1916. Temperature of water 55° F., air 50° at 3.30 p.m.
According to the field notes and sketches of Mr. F. Johansen, the living animals
were conspicuously coloured, which is frequently true of this cladoceran.
Various sizes, some females carrying a number of eggs in the brood chamber,
from which the young ones emerged the next day (July 4). This form is widely
distributed in the northern portions of Europe, Asia, and North America.

MARINE CLADOCERA.
Podon leuckarti G. O. Sars.

This form was found in surface catches obtained with a tow net at Station
20a, Grantley harbour, Alaska, July 30, 1913; Station 20h, Port Clarence bay,
and at Station 21 a, b, c, 68° 30’ N. and 166° 32’ W.

This species of Podon has been reported from the west coast of Norway,
from the Skagerrack, the Kattegat, and the North sea.

Evadne nordmanni 8. Lovén.

This marine cladoceran was obtained in surface tow net catches from
Station 20a, Grantley harbour, Alaska; from Station 20h, Port Clarence bay,
and from Station 21 a, b, c, 68° 30’ N. and 166° 32’ W. It was most abundant
in the material from Station 20a. This is also a widely distributed form. In
the north it has been found on the west coast of Norway, up to 72° N. latitude,
in the North sea, on the west coast of Scotland, and along the coast of Nova
Scotia. In the south it has been reported from the west coast of Africa.

LITERATURE.

Apstein, C. 1904. Cladocera (Daphnidae). Nordisches Plankton.

Birge, ee - 1918. The water fleas (Cladocera). In Ward and Whipple’s Freshwater Biology,
pp. 676-740.

Brehm, V. 1911. Die Entomostraken der Danmark-Expedition. Meddelelser om Gregnland,
Bd. 45, pp. 305-317, pls. 18 and 19.

Cushman, J. A. 1908. Freshwater crustacea from Labrador and Newfoundland. Proc. US.
Nat. Mus., Vol. XX XIII, pp. 705-713, pls. 58-62.

Ekman, 5S. 1905. Cladoceren und Copepoden aus antarktischen und subantarktischen Binnen-
gewissern. Wiss. Ergeb. der Schwed. Siidpolar Exped., Bd. V, Lief. 4.

Juday, C. and Muttkowski, R. A. 1915. Entomostraca from St. Paul island,Alaska. Bull.
Wis. Nat. Hist.Soc., Vol. XIII, pp. 23-31.

Lilljeborg, W. 1900. Cladocera Sueciae. pp. 701, pls. 87. Upsala.

Sars, G. O. 1898. Cladocera, Copepoda, and Ostracoda of the Jana Expedition. Annuaire
Mus. Zool. Acad. Imp. Sci., St. Petersburg, T. 2, pp. 324-359, pls. VI-XI.

Sars, G.O. 1906. Crustacea of the “‘ Neptune’”’ Expedition. Natural history report, Depart-
ment of Marine and Fisheries, Ottawa.

Stephensen, K. 1913. Account of the crustacea and the Pycnogonida collected in 1911. Meddel.
om Gr¢nland, Vol. 51, pp. 55-77.

Stephensen, K. 1913. Conspectus crustaceorum et pycnogonidorum Groenlandiz. Meddel.
om. Grgnland, Vol. 22, pp. 386-99.

Wesenberg-Lund, C. 1894. Grgnlands Ferskvandsentomostraca. I. Phyllopoda, branchio-
poda, et cladocera. Vid. Meddel. Naturhist. Foren. Kbhvn, pp. 82-173. Bee also Meddel.
om. Grgnland, Vol. 19, 1895, pp. 135-39.

Wesenberg-Lund, C. and Ostenfeld, C. H. 1906. A regular fortnightly exploration of the
plankton of two Icelandic lakes, Thingvallavatn and Myvatn. Proc. Roy. Soc., Edinburgh,
Vol. 25, Part II, pp. 1092-1167.

Wright, R. R. 1907. The Plankton of eastern Nova Scotia waters. Sessional paper No. 22a,
Tenth Parliament, Dominion of Canada, Vol. 41, pp. 1-15, pls. 7. :

~ Part E:.Coleoptera. By J: M. Swaine, H.C. Palle ow. Leng, and J. D. Sherman, Jr. (Issued
Part F: Hemiptera.
Part G: Hymenoptera ‘and Plant Galls. By Alex. dD. MacGillivray, Charles ‘T, Brues, F. W. L. Sladen,

“By J. A. Emerton, Nathan Banks, anil Ralph V. Chamberlin.

U

Part A:
Part B:

Part A:
Part B:

Part A:
Part B:
Part C:
Part D:

Report of the Canadian Arctic Expedition, 1913-1918.

Volume I: General Introduction, Narrative, Ete.
Northern Party, 1913-18.
Bouthem Party, 1913-16. By, Rudolph Martin Anderson. (In preparation).
_* Volume I: Mammals and Birds.
‘Teall, By Rudolph Martin Anderson. (In preparation).
ae ) By R. M, Anderson and P. A. Taverner. mane n preparation).
\' Volume II: Insects.

Seaottaatiea: By Cc. Gordon Hewitt. (In press),
Collembola. By Justus W. Folsom: ~(Issued). : ——

leuropteroid Insects. By Nathan Banks.. | (Issued); ”

iptera. By-Chas. W. Alexander, Harrison G. Dyar, and J. R. Malloch. ‘(lewuad
Mallophaga and Anoplura. By A. W. Baker, G. F. Ferris, and G. H. F. Nuttall.

By E. P. Van-Duzee. (Issued

and E. Porter.Felt. (Issued

Part H: Sa Mites, and Myriapoda,

(Issued),
Part I: Lepidoptera. ‘By Arthur Gibson. (J saued).
Part J: Orthoptera. By E.M. Walker. (In press).
Part, K: General Observations on Insect Life in the Arctic. By Frits Johansen. (In preparation):

Part’A:
Part B:

Volume IV: Botany.

Ma su. Ds

Frehwater Algae snd Freshwater Diatoms. By Charles W. Lom: (In Bepuration. y

Marine Algae. By F. Collins. (In preparation).

Part.C: Fungi. _By John Dearness. . (In preparation). :
- Part D: Lichens. By K.L. Merrill. (In preparation).. :

Part E:

Part A:
Part B:

ae By R. S. Williams. (Jn press). .
Volume V: Botany._

&
Tbweiig Plants and Ferns . By James M. Macoun and Pilieailoge Holm. (In ‘ ccseubal

General Notes on Arctic Vegetation. ‘By Frits Johansen. (In preparation).
Volume VI: Fishes, Tunicates, Ete. )

, e Part A: Fishes. ‘By F. Johansen. (In preparation)..

Part B: Ascidians, ete. By A.G. Huntsman. (In ‘preparation). { -
, : ; ‘ Volume VII: Crustacea.
Part A: Deeapod Crustaceans. By Mary J. Rathbun: (Issued).

-Part B:

Schizopod Crustaceans. By Waldo L. Schmitt. (sowed).

ere Cumacea.. By W. T. Calman. (In press).
D: Isopoda. By Miss P. L. Boone. (In press).

P t E:
"part F:

Amphipoda. By Clarence RE Shoemaker. (In press).
ycnogzonida. Leon J.Cole. (In press). -

x one Euphyllopoda. By F. Johansen. - (In preparation). :
‘art H

Part I:

ocera. By Chancey Juday. (In press). ‘
: Ostracoda. By R. W. Sharpe. | (In preparation). rae

Part J: ‘Freshwater Copepoda. By C\ Dwigh t Marsh, ite,
Part K: Marine Copepoda. ar Willey. ‘Ussued).

Part L:

Parasitic Copepoda. By Chas. B. Wilson. (In press). a

Hart. Cirripedia. By H. A. Pilsbry.. (In: preparation).:

_ Part A:
~' Part B:
Part C:

Volume VIII: Mollusks, Echinoderms, Coelenterates, Etc.

Mollusks, Recent and Pleistocene. By Wm. H. Dall. (Issued).
Cephalopoda and Pteropoda. By S. 8. Berry and. W. F. Clapp. ‘(In preporation).
Echinoderms. By Austin H. Clark. (Issued). E !

Part D: Bryozoa. .By R.C. Osburn. : (In preparation).

Part E:
Part F:

Rotatoria. us H. K. Harring. (In:preparation).
Chaetognatha. By A.G. Huntsman. (In preparation).

? , ‘Part G: Actinozoa and Alcyonaria. By A. E. Verrill. (In preparation). ‘
“ Part H: Medusae and Ctenophora. By H. B. Bigelow. ~ (In press),

Part I:
‘PartJ:

Part A:
Part
Part C:

Hydroids. By McLean Fraser. (In preparation).
Porifera. . o : as ;
oy Volume IX: Annelids, Parasitic Worms, Protozoans, Etc.
Oligochaeta. By Frank. Smith and Paul S. Welch. (Issued).

B: Polychaeta: By Ralph V. gy aeeeien (In. press).

Hirudinea. By J.P. Moore. (In pi

ess).
- Part D: Gephyrea: By Ralph V. Chasibertin. lervadiz

Part E:
Part F:

Acanthocephala. ae) J. Van Cleave. (Issued).
Nematoda. By N.A.Cobb. (In preparation).

Part G: Trematoda. By A. R. Cooper. (In preparation).
Part. H: Cestoda. By A. R. Cooper. (In preparation). te
Part I: Turbellaria. By A. Hassell. In preparation).

Part J:

Part K: Nemertini.

. Part L:
sags M:

‘Part es

_ Part B:

Part Cc:

Gordiacea. > Pa ae

Sporozoa.. By J. W. Mavor. (In preparation).
Foraminifera. By J. A. Cushman. (Issued).

y Volume X: Plankton, Hydrography, Tides, Ete.
Plankton, Marine. Diatoms. By Albert Mann. (In preparation).
Tidal Observations and Results. By W. Bell Dawson. (In press).
Hydrography. dn preparation). : =~ os