Reports

REPORT

OF THE

CANADIAN ARCTIC EXPEDITION

1913-18

VOLUME VIII: MOLLUSKS, ECHINODERMS,
COELENTERATES, ETC.

PART E: ROTATORIA

By H. K. HARKING

SOUTHERN PARTY— 1913-19

OTTAWA
F. A. ACLAND

PRINTER TO THE KING'S MOST EXCELLENT MAJESTY
1921

Issutd December 31, 1921.

Report of the Canadian Arctic Expedition, 1913-18.

VOLUME 1: NARRATIVE OF THE EXPEDITION

Part A: NORTHERN PAKTY, U)i:M<. By Yilhjalmur Stefansson...
PartB: 9QTJTHERN PARTY, 1W3 !'i. I'.y Rudolph Martin Anderson

VOLUME II: MAMMALS AND BIRDS

(In preparation).
. . (In preparation).

Part A: MAMMALS OF WESTERN ARCTIC AMERICA. By Rudolph Martin Anderson.

(In preparation)

PartB: BIRDS OF WESTERN ARCTIC AMERICA. By R. M. Anderson and P. A. Taverner!

(In preparation).

VOLUME III: INSECTS

INTRODUCTION. By C. Gordon Hewitt . . (Issued December 10, 19SO)

Part A: COLLEMBOLA. By Justus W. Folsom (Issued July 10, 1919)

P:irt B: NEUROPTEROID INSECTS. By Nathan Banks (Issued July 11 1919)

Part C: DIPTERA.

Crane-flies. By Charles P. Alexander.

Mosquitoes. By Harrison G. Dyar.

Diptera (excluding Tipulidie Culicidee). By J. R. Malloch (Issued July 14, 1919).

Part D: MALLOPHAGA AND ANOPLURA.

Mallophaga. By A. W. Baker.

Anoplura. By G. F. Ferris and G. H. F. Nuttall (Issued September 12, 1919)

PartE: COLEOPTERA.

Forest Insects, including Ipidse, Cerambycidse, and Buprestidae. By J. M. Swaine.

Carabidffi and Silphidse. By H. C. Fall.

Coccinellidoe, Elateridse, Chrysomelidse and Rhynchophora. (Excluding Ipidse.)

By C. W. Leng.

Dystiscidse. By J. D. Sherman, Jr (Issued December 18, 1919).

Part F: HEMIPTERA. By Edward P. VanDuzee . . (Issued July 11, 1919).

Part G: HYMENOPTERA AND PLANT GALLS.

Sawflies. (Tenthredinoidea). By Alex. D. MacGillivray.

Parasitic Hymcnoptera. By Charles T. Brues.

Wasps and Bees. By F. W. L. Sladen.

Plant Galls. By E. Porter Felt (Issued November S, 1919).

PartH: SPIDERS, MITES AND MYRIAPODS.

Spiders. By J. H. Emerton.

Mites. By Nathan Banks.

Myriapods. By Ralph V. Chamberlin (Issued July 14, 1919).

Part I: LEPIDOPTERA. By Arthur Gibson (Issued January 10, 1920).

Part J: ORTHOPTERA. By E. M. Walker (Issued September 4, 1920).

Part K: INSECT LIFE ON THE WESTERN ARCTIC COAST OF AMERICA. By Frits

Johansen (In press)

VOLUME IV: BOTANY

Part A: FRESHWATER ALG.E AND FRESHWATER DIATOMS. By Charles W. Lowe.

(In preparation).

Part B: MARINE ALG^E. By F. S. Collins (In preparation).

Part C: FUNGI. By John Dearness (In preparation).

Part D: LICHENS. By G. K. Merrill (In preparation).

Part E: MOSSES. By R. S. Williams (Issued February 8, 1921).

VOLUME V: BOTANY

Part A: VASCULAR PLANTS. By James M. Macoun and Theo. Holm (Issued October 14, 1921}

PartB: CONTRIBUTIONS TO THE MORPHOLOGY, SYNONYMY AND GENERAL DIS-
TRIBUTION OF ARCTIC PLANTS. By Theo. Holm (In press).

PartC: GENERAL NOTES ON ARCTIC VEGETATION. By Frits Johansen. (/« preparation).

VOLUME VI: FISHES, TUNIC ATES, ETC.

Part A: FISHES. By F. Johansen (In preparation).

Part B: ASCIDIANS, ETC. By A. G. Huntsman (In preparation).

VOLUME VII: CRUSTACEA

Part A: DECAPOD CRUSTACEANS. By Mary J. Rathburn. . . . . (Issued August 18, 1919)

Part B: SCH1ZOPOD CRUSTACEANS. Bv Waldo L. Schmitt (Issued September 22, 1919).

Part C: CUM ACEA. By W. T. Caiman (Issued October 15, 1920).

Part D: ISOPODA. By P. L. Boone (Issued November 10, 1920).

Part E: AMPHIPODA. By Clarence R. Shoemaker (Issued September 7, 19SO).

Part F: PYCNOGONIDA. By Leon J. Cole (Issued January 3, 1921).

Part G: EUPHYLLOPODA. By F. Johansen (In preparation).

Part H: CLADOCERA. By Chancey Juday (Issued June 23, 1920).

Part I OSTRACODA. By R. W. Sharpe (In preparation).

Part J FRESHWATER COPEPODA. By C. D wight Marsh (Issued April 81, 1920).

Part K MARINE COPEPODA. By A. Willey (Issued June 25, 1920).

Part L: PARASITIC COPEPODA. By Charles B. Wilson (Issued August 6, 1920).

Part M: CIRRTPEDIA. By H. A. Pilsbury (In preparation),

REPORT

OF THE

CANADIAN ARCTIC EXPEDITION

1913-18

VOLUME VIII: MOLLUSKS, ECHINODERMS,
COELENTERATES, ETC.

PART E: ROTATORIA

By H. K. HARKING

SOUTHERN PARTY— 1913-1916

OTTAWA
F. A. ACLAND

PRINTER TO THE KING'S MOST EXCELLENT MAJESTY
1921

Issied December 31, 1921 .

The Rotatoria of the Canadian Arctic Expedition,

1913-1918.

By H. K. HARKING,

Custodian of Rotatoria, U. S. National Museum.

When the Canadian Arctic Expedition was organized with Mr. James
Murray as oceanographer and marine biologist, all students of the rotifers
looked forward to a considerable increase of our knowledge of the group and
hoped for a repetition of his success in the Antarctic as biologist of the Shackle-
ton Expedition. These expectations were frustrated through his death following
the loss of the Karluk and the career of an enthusiastic naturalist 'and tireless
worker was brought to an untimely end. No other member of the expedition
was able to make special collections of rotifers, but the general plankton collec-
tions made by the marine biologist of the southern party, Mr. Frits Johansen,
contained a considerable number of rotifers, which were assigned to the writer
for a report. Some collections made by Mr. J. M. Jessup while serving on
the Alaskan Boundary Survey have been included, as they belong to the same
faunal area and add somewhat to our scanty knowledge of the distribution
of the Rotatoria in the Arctic. Virtually all that we know on this subject
is to be found in Bergendal's Zur Rotatorienfauna Gronlands (1892), and the
value of this is somewhat minimized by his unfamiliarity with the group prior
to his visit to Greenland.

While the species reported on here are not very numerous, 64 in all, they
furnish additional, even if superflous, evidence that climate is not directly a
factor in rotifer distribution. Four new species are described, among which a
pelagic Synchaeta is of special interest, as it is an addition to the extremely
small number of rotifers known to exist in the open ocean in water of normal
salinity. The total absence of the genus Brachionus, so abundant elsewhere,
is noteworthy; Bergendal mentions two species of this gemis from Greenland,
but his notes on these forms make it somewhat doubtful whether he really
found any Brachinoids.

I am indebted to Mr. Frank J. Myers, of the American Museum of Natural
History, New York City, for drawing the plates accompanying this report.

ORDER PLOIMA.
FAMILY NOTOMMATID^E.

Notommata copeus Ehrenberg.

A few specimens of this species were collected by Jessup in lakes on Old Crow
river flats, 55 miles north of New Rampart House, on July 10, 1911.

Notommata cyrtdpus Gosse.

Several specimens occurred in a collection from a pond near new Rampart
House, at the International Boundary and Porcupine river, made by Jessup
on June 12, 1911.

Proales sordida Gosse.

A few specimens in a collection made by Johansen among mosses and algae
from a pond at Chantry island, Bernard haitcur, Eclphin and Union strait,
on June 17, 1916.

4 E Canadian Arctic Expedition, 1913-18

Diaschiza forficata (Ehrenberg).

Diaschiza caeca DIXON-NUTTALL and FREEMAN, Journ. Royal Micr. Soc.,
1903, p. 134, pi. 4, fig. 11.

Abundant in a collection made by Johansen from a pond on the ridge at
Bernard harbour, on July 3, 1916.

Diaschiza gracilis (Ehrenberg).

Common among algae growing on stones in river bed at Bernard harbour,
August 16, 1915; abundant in ponds on the ridge at Bernard harbour, July
3, 1916. Both collections were made by Johansen.

Diaschiza gibba (Ehrenberg).

In a collection made by Johansen from ponds on the ridge at Bernard
harbour, July 3, 1916, rare. In Jessup's collections from a muskeg lake, 28
miles north of New Rampart House, June 25, 1911, rare; lakes on Old Crow
river flats, 40 miles north of New Rampart House, July 3, 1911, few; lakes
along the International Boundary, 48 miles north of New Rampart House,
July 7, 1911, few; pools at Fort Yukon, May 24, 1912, rare.

Dicranophorus forcipatus (Miiller).

Diglena forcipata HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 50, pi. 19,
fig. 2.

Collected by Johansen among algae growing on stones in the river bed at
Bernard harbour, August 16, 1915, few; by Jessup from lakes on Old Crow
river flats, 40 miles north of New Rampart House, July 3, 1911, few. The
trophi of these Arctic specimens have only five large, relatively blunt, teeth
in each ramus, while the typical form has eleven or twelve. It is possible
that they may represent an undescribed species ; the partly contracted material
was not in such a condition as to make this clear.

Encentrum algente, new species.
Plate I, figs. '1, 2.

The body is elongate and very slender, almost vermiform; the integument
is soft and flexible and the animal highly contractile.

The head is small and cylindric, its diameter somewhat less than that
of the abdomen, from which it is separated by a slight constriction at the level
of the gastric glands. The abdomen is cylindric nearly its entire length; pos-
teriorly it is slightly reduced at its junction with the foot, which has two joints
of nearly equal length. The toes are short, about one twentieth of the entire
length, blade-shaped and slightly decurved, with slender, acute points.

The corona is terminal; the lateral, marginal cilia are somewhat longer
than the rest and form rudimentary auricles. The dorsal antenna is a small,
ciliated pit in the normal position; the lateral antennae are on the posterior
fourth of the abdomen.

The trophi are forcipate and of a rather unusual type. The rami are of the
normal lyrate form, terminating in a strong, pointed tooth; on the inner edge,
about mid-length, there is an additional fairly large, pointed tooth. The
fulcrum is unusually well developed, its length being fully equal to the length
of the rami. The unci are aberrant; a single, short and robust tooth, hinged
to the ramus at mid-length on a knob-like epiphysis, appears to represent the
uncus proper; it is connected to the manubrium through a rather slender bar,
enlarged at the posterior end, and nearly as long as the tooth itself. The

Rotatoria E 5

manubria are long and strongly curved, so that their posterior ends meet in the
median line. The bar intervening between the uncus and manubrium is prob-
ably only a local sclerification of the walls of the mastax, developed in response
to a specialization of the typical forcipate trophi. A very similar structure
is found in Encentrum ricciae Harring; comparison may be made with Encen-
trum ( = Diglena) hofsteni de Beauchamp, which shows a simpler stage of the
same development. The unci and the supplementary piece are no doubt
closely joined to the rami, the several pieces moving together virtually as a
unit.

The oesophagus is long and slender. The gastric glands are elongate
oval and fairly large; they open into the stomach very close to the junction
with the oesophagus. There is no constriction between the stomach and
intestine. The ovary is fairly large and of somewhat irregular outline. A
small bladder is present. The foot glands are pyriform and rather small; no
mucus reservoir is present.

The ganglion is elongate saccate; no retrocerebral organ or eyespots are
present.

Total length 360M; toes, 22U; trophi, 52M.

This species was found in abundance in a collection made by Johansen
among algae in a brackish lagoon west of Martin point, on the arctic shore of
Alaska, on July 28, 1914.

FAMILY BRAGHIONID^:.
Platyias quadricornis (Ehrenberg).

Nbteus quadricornis HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 121.
pi. 28, fig. 5.

A few specimens occurred in a collection from lakes on Old Crow river
flats, 80 miles north of New Rampart House, visited by Jessup on July 11, 1911.

Keratella quadrata (Muller).

Anuraea aculeata HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 123, pi. 29
% 4.

This species is widely distributed in the Arctic; it was found in the follow-
ing localities: among algae in a brackish lagoon west of Martin point, arctic
Alaska, July 28, 1914; in freshwater plankton from the lake south of Bernard
harbour, November 28, 1915; May 6 and 7, -May 21, and June 12, 1916; all
collections were made by Johansen. In Jessup's material it occurred in a
small pool near the International Boundary line, lat. 69° 20' N., long. 141° W.,
July 23, 1912, and in a slough of Old Crow river, near New Rampart House.

Keratella cochlearis (Gosse).

Anuraea cochlearis HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 124, pi.
29, fig. 7.

Not common in the Arctic; a few specimens were collected by Johansen
in the lake south of Bernard harbour, May 21 and June 12, 1916; by Jessup
in a pool near the Boundary line, lat. 69° 20' N., July 23, 1912, and in a slough
of Old Crow river, near New Rampart House, August 7, 1912.

Notholca striata (Muller).

This is the most abundant and widely distributed rotifer in the Arctic;
it was collected by Johansen in a brackish lagoon at Martin point, Alaska,
July 28, 1914; in the river-bed at Bernard harbour, August 16. 1915; ponds

24058—2

6E

Canadian Arctic Expedition, 1913-18

on the ridge at Bernard Harbour, July 3, 1916; by Jessup in a pool at White
Horse, Yukon Territory, June 11, 1911; pond near New Rampart House,
International Boundary and Porcupine river, June 12, 1911; lakes on Old
Crow river flats, 40 miles north of New Rampart House, July 3, 1911; lakes
on Old Crow river flats, 55 miles north of New Rampart House, July 10, 1911;
lakes on Old Crow river flats, 60 miles north of New Rampart House, July 11,
1911 ; small muddy pool near the Boundary line, 25 miles north of New Rampart
House, July 17, 1911; pools at Fort Yukon, May 24, 1912; slough of Old Crow
river, near New Rampart House, August 7, 1912.

Notholca longispina (Kellicott).

Collected by Johansen in a brackish lagoon west of Martin point, arctic
Alaska, July 28, 1914; abundant in the lake south of Bernard harbour, Novem-
ber 28, 1915; February 15, May 21 and June 12, 1916.

FAMILY EUCHLANHXE.
Mytilina ven trails (Ehrenberg).

Salpina macracantha HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 84,
pi. 22, fig. 6.

In Jessup's collections from a pond near New Rampart House, at the Inter-
national Boundary and Porcupine river, June 12, 1911; lakes on Old 'Crow
river flats, 40 miles north of New Rampart House, July 3, 1911; lake 48 miles
north of New Rampart House, July 7, 1911.

Mytilina mucronata (Muller).

Salpina mucronata HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 83, pi. 22,
fig. 1.

A few specimens collected by Jessup in lakes on Old Crow river flats, 40
miles north of New Rampart House, July 3, 1911.

Euchlanis dilatata Ehrenberg.

This species does not appear to be common in the Arctic; it was collected
by Johansen among algae growijig on stones in the river at Bernard harbour,
on August 16, 1915, and in a pond at Chantry Island, Bernard harbour, on
June 17, 1916; in Jessup's material it occurred in fair numbers in a collection
from lakes on Old Crow river flats, 60 miles north of New Rampart House,
on July 11, 1911.

Euchlanis pellucida, new species.

Plate 2, figs. 1-5.

The , corona agrees with that of other species of the genus. The body is
(teiradiate in cross section and has a high dorsal keel and broad, lateral, wing-
Lke expansions. The ventral plate is nearly circular, slightly constricted
anteriorly at the opening for the head; it is joined directly to the lateral plates
without the intervention of a longitudinal sulcus as in other species of the
genus. The foot is obscurely two-jointed; two long setae project from the
dorsal side of the first foot joint. The toes are long, slender and nearly straight,
slightly enlarged posteriorly, and end in rather blunt points; their length is
more, than one fifth of the length of the body.

Rotator ia E 7

The dorsal antenna is very large in diameter and obliquely truncate;
it bears a small tuft of sensory setae in a shallow, central depression. The
lateral antennae are in the normal position.

The mastax, stomach, intestine, ovary and bladder are normal. The large
retrocerebral sac is slightly opaque at the posterior end and without any median
notch.

The width of the median and lateral ribs or keels is variable, as shown in
figs. 3-5, plate 2. The lateral ribs usually project straight out from the body
or slightly downwards; the form with strongly upcurved ribs is not common.

Total length 500-800M; length of lorica, 300-480^; width of lorica, 270-
430M; length of toes 90-140M.

This species has been known to the writer for some time from many locali-
ties in the United States; it was collected by President Birge, of the University
of Wisconsin, and Mr. Juday, of the Wisconsin Geological and Natural History
Survey, in ponds and bayous of the Mississippi river in southern Louisiana;
by Mr. Frank J. Myers, around Atlantic City, New Jersey, and in Polk county,
Florida; by Mr. Myers and the writer in sphagnum bogs and ponds throughout
Vilas and Oneida counties, Wisconsin. It was common in a collection made
by Jessup in lakes on Old Crow river flats, 40 miles north of New Rampart
House, on July 3, 1911. The presence of this species in the Arctic is of no special
significance, as the collections listed above show that it is widely distributed;
it seems, however, to be limited to regions with very soft, non-calcareous waters,
where it often occurs in great abundance.

Euchlanis pellucida looks superficially very much like E. triquetra, but
it is considerably larger and readily distinguished from the latter by the absence
of the lateral sulcus.

Euchlanis deflexa Gosse.

This species, which is ordinarily considered quite rare, was common in
Jessup's collections: from a pond near Yukon river, Yukon Territory, May 26,
1911; pool at White Horse, Yukon Territory, June 7, 1911; lakes on Old Crow
river flats, 35 miles north of New Rampart House, June 23, 1911; lakes on
Old Crow river flats, 40 miles north of New Rampart House, July 3, 1911; two
lakes on Old Crow river flats, 55 miles north of New Rampart House, July 10,
1911; pools at Fort Yukon, May 24, 1912.

Euchlanis triquetra Ehrenberg.

Collected in abundance by Jessup in lakes on Old Crow river flats, 40 miles
north of New Rampart House, July 3, 1911; two lakes on Old Crow river flats,
55 miles north of New Rampart House, July 10, 1911; pools at Fort Yukon,
May 24, 1912, and in a slough of Old Crow river, near New Rampart House,
August 7, 1912.

Euchlanis eoropha Gosse.

A few specimens of this comparatively rare species were collected by
Jessup in lakes on Old Crow river flats, 40 miles north of New Rampart House,
July 3, 1911, and in a small muddy pool 25 miles north of New Rampart House,
July 17, 1911.

Lecane ephestra, new species.
Plate 3, figs. 1, 2.

The outline of the lorica is slightly ovate; the anterior margins of the
dorsal and ventral plates are coincident and straight. The anterior spines
are very short and rather stout. The dorsal plate is broadly elliptic and rounded
posteriorly; it is without markings. The ventral plate is considerably narrower

24058— 2i

8 E Canadian Arctic Expedition, 1918-18

than the dorsal and nearly parallel-sided; the margins are ill-defined and no
longitudinal sulci are present. The markings are confined to the central area
of the ventral plate; the transverse fold is well marked. The posterior segment
of the body is rounded and projects very slightly beyond the dorsal plate.

The first foot joint is narrowest at the posterior end; the second foot joint
is large and subsquare; it projects beyond the lorica. The coxal plates are
obtusely triangular, with their apices close to the second foot joint. The toes
are long and slender; the outer edges are very slightly curved; a small claw is
present, excavate on the inner margin.

Total length 125/i; length of dorsal plate 84/*, width 88/1; length of ventral
plate 90ju, width 60ju; width of anterior points 54/x; length of toes including
claws 3o*M, length of claw 6/z.

Lecane ephestra was collected by Jessup in a muskeg lake, 28 miles north
of New Rampart House, on June 25, 1911; lakes on Old Crow river flats, 40
miles north of New Rampart House, on July 3, 1911; ponds 48 miles north of
New Rampart House, on July 7, 1911; two lakes on Old Crow river flats, 55
miles north of New Rampart House, on July 10, 1911; it has been collected
in the United States by Mr. Frank J. Myers around Atlantic City, New Jersey,
and by Mr. Myers and the writer in Vilas and Oneida counties, Wisconsin.

Lecane mira Murray.

Cathypna mira MURRAY, Journ. Royal Micr. Soc., 1913, p. 553, pi. 22, fig. 3.

Abundant in a collection made by Jessup in lakes on Old Crow river flats,
40 miles north of New Rampart House, July 3, 1911 ; also in lakes 48 miles north
of New Rampart House, July 7, 1911, and two lakes on Old Crow river flats,
55 miles north of New Rampart House, July 10, 1911.

Lecane ligona (Dunlop).

Cathypna ligona DUNLOP, Journ. Quekett Micr. Club, ser. 2, vol. 8, 1901,
p. 29, pi. 2, figs. 4-6.

A few specimens of this rare species were collected by Jessup in lakes on
Old Crow river flats, 40 miles north of New Rampart House, July 3, 1911, and
in two lakes on Old Crow river flats, 55 miles north of New Rampart House,
July 10, 1911.

Lecane hornemanni (Ehrenberg).

Cathypna hornemanni MURRAY, Journ. Royal Micr. Soc., 1913, p. 349, pi.
16, fig. 26.

Collected by Johansen among algae growing on stones in the river bed at
Bernard harbour, August 16, 1915; by Jessup in lakes on Old Crow river flats,
40 miles north of New Rampart House, July 3, 1911.

Lecane jessupi, new species.

Plate, 3 figs. 3, 4.

The outline of the lorica is slightly ovate, truncate posteriorly and the
anterior margin cuspidate. The dorsal plate is ovate, rounded posteriorly and
slightly narrower than the ventral plate, which is somewhat elliptic. The
anterior margin of the dorsal plate is nearly straight; it is slightly convex for
the greater portion of its width and excavate at the lateral cusps; the anterior
margin of the ventral plate is lunate. There are no markings on either dorsal
or ventral plate; the lateral sulci are deep. The lorica is strongly compressed
dorso-ventrally.

Rotatoria E 9

The posterior segment of the body is roughly trapezoidal in oultline and
cuspidate at the posterior angles; the margin is convex in the median portion
and has a slight concavity at the angles. There is a well marked constriction
at the junction of the ventral plate and the posterior segment. The coxal
plates are semi-ovate.

The first foot joint is well marked and widest posteriorly; the second foot
joint is nearly square. The toes are short, cylindric for one half their length
and end in acute, conical points.

Total length 126 /z, length of lorica lOS/*; length of dorsal plate 93^; width
13 //; width of ventral plate 96 /*; width of anterior points 58 ju; length of toes
27 /JL.

Lecane jessupi had some resemblance to L. brachydactyla (Stenroos), which
is shown on plate 3, figs. 5, 6, for comparison. The differences are fairly evident:
L. brachydactyla has anterior spines and a straight, somewhat flexible dorsal
margin, a double-curved ventral margin and the posterior segment is very
simple in outline. L. jessupi was collected by Jessup in lakes on Old Crow
river flats, 40 miles north of New Rampart House, on July 3, 1911; it was
not abundant.

Lecane luna (Miiller).

Cathypna luna HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 94, pi. 24, fig. 4.

Apparently not common in the Arctic; it was collected by Jessup from two
Fakes on Old Crow river flats, 55 miles north of New Rampart House, on July
10, 1911, and ponds on Old Crow river flats, 60 miles north of New Rampart
House, on July 11, 1911.

Lecane ungulata (Gosse).

Cathypna minnesotensis MURRAY, Journ. Royal Micr. Soc., 1913, p. 345,
pi. 13, fig. 18.

A few specimens in a collection made by Jessup from two lakes on Old Crow
river flats, 55 miles north of New Rampart House, on July 10, 1911.

Lecane clara (Bryce).

Distyla clara BRYCE, Science Gossip, vol. 28, 1892, p. 271, text fig.

Collected by Jessup from lakes on Old Crow river flats, 40 miles north of
New Rampart House, on July 3, 1911, and in a slough of Old Crow river, near
New Rampart House, on August 7, 1912. Only a few specimens were found
in each collection.

Lecane depressa (Bryce).

Distyla depressa BRYCE, Science Gossip, vol. 28, 1892, p. 271, text fig.

Common in a collection made by Johansen among algae growing on stones
in the river bed at Bernard harbour, on August 16, 1915. In Jessup's col-
lections from lakes on Old Crow river flats, 35 miles north of New Rampart
House, on June 23, 1911; muskeg lake, 28 miles north of New Rampart House,
on June 25, 1911; lakes on Old Crow river flats, 40 miles north of New Rampart
House, on July 3, 1911; lakes on Old Crow river flats, 60 miles north of New
Rampart House, on July 11, 1911; small muddy pool, 25 miles north of New
Rampart House, on July 17, 1911.

Lecane flexilis (Gosse).

Lecane flexilis HARRING, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 538, pi. 19,
figs. 1-3.

10 E

Canadian Arctic Expedition, 1913-18

Collected by Johansen among algae growing on stones in the river bed
at Bernard harbour, on August 16, 1915; in Jessup's collections from lakes
on Old Crow river flats, 40 miles north of New Rampart House, on July 3, 1911,
and lakes on Old Crow river flats, 60 miles north of New Rampart House, on
July 11, 1911.

Monostyla hamata Stokes.

A few specimens in Jessup's collections from lakes on Old Crow river flats,
40 miles north of New Rampart House, on July 3, 1911; two lakes on Old
Crow river flats, 55 miles north of New Rampart House, on July 10, 1911;
ponds on Old Crow river flats, 60 miles north of New Rampart House, on
July 11, 1911.

Monostyla bulla Gosse.

This species was found in small numbers in Jessup's collections from lakes
on Old Crow river flats, 40 miles north of New Rampart House, on July 3, 1911.

Monostyla closterocerca Schmarda.

Monostyla closterocera MURRAY, Journ. Royal Micr. Soc., 1913, p. 357, pi.
15, fig. 39.

A few specimens in Jessup's collections from lakes on Old Crow rive;*
flats, 60 miles north of New Rampart House, July 11, 1911.

Monostyla crenata Harring.

Collected by Jessup in two lakes on Old Crow river flats, 55 miles north
of New Rampart House, July 10, 1911; not common.

Monostyla lunaris Ehrenberg.

Abundant and widely distributed in the Arctic. It was collected by
Johansen among algae growing on stones in the river bed at Bernard harbour,
on August 16, 1915; by Jessup in a muskeg lake, 28 miles north of New Ram-
part House, on June 25, 1911; lakes on Old Crow river flats, 40 miles north of
New Rampart House, on July 3, 1911; lakes 48 miles north of New Rampart
House, on July 7, 1911; two lakes on Old Crow river flats, 55 miles north of
New Rampart House, on July 10, 1911; ponds on Old Crow river flats, 60 miles
north of New Rampart House, on July 11, 1911; small muddy pool, 25 miles
north of New Rampart House, on July 17, 1911; slough of Old Crow river,
near New Rampart House, on August 7, 1912.

Monostyla cornuta (Mtiller).

A few specimens collected by Johansen in the lake south of Bernard harbour,
on May 21, 1916; by Jessup in a pond near New Rampart House, at the Inter-
national Boundary and Porcupine River, on June 12, 1911.

Lepadella ovalis (Miiller).

Lepadella ovalis HARRING, Proc. U. S. Nat. Mus., vol. 51, 1916, p. 537,
pi. 89, figs. 4-10.

Collected in small numbers by Jessup from lakes on Old Crow river flats,
40 miles north of New Rampart House, on July 3, 1911; two lakes on Old
Crow river flats, 55 miles north of New Rampart House, on July 10, 1911;
pools at Fort Yukon, May 24, 1912.

Rotator ia E 11

Lepadella patella (Miiller).

Lepadella patella HARRING, Proc. U. S. Nat. Mus., vol. 51, 1916, p. 539,
pi. 90, figs. 1-12; pi. 91, figs. 1, 2.

This species is widely distributed in the Arctic, but apparently in small
numbers; it was collected by Johansen among algae in the river bed at Bernard
Harbour, on August 16, 1915; pond at Chantry Island, Bernard harbour, on
June 17, 1916; by Jessup in a pond near New Rampart House, at the Inter-
national Boundary and Porcupine river, on June 12, 1911; lakes on Old Crow
river flats, 40 miles north of New Rampart House, on July 3, 1911; lakes 48
miles north of New Rampart House, on July 7, 1911: ponds on Old Crow river
flats, 60 miles north of New Rampart House, on July 11, 1911; pools at Fort
Yukon, on May 24, 1912.

Lepadella acuminata (Ehrenberg).

Lepadella acuminata HARKING, Proc. U. S. Nat. Mus., vol. 51, 1916, p.
546, pi. 92, figs. 4-8.

A few specimens of this species were collected by Jessup in a pond near
New Rampart House, at the International Boundary and Porcupine river, on
June 12, 1911.

Lepadella ehrenbergii (Perty).

Lepadella ehrenbergii HARRING, Proc. U. S. Nat. Mus., vol. 51, 1916, p. 553,
pi. 94, figs. 1-4.

In Jessup's collections from lakes on Old Crow river flats, 40 miles north of
New Rampart House, on July 3, 1911.

Colurella colurus (Ehrenberg).

Colurus amblytelus HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 104, pi. 26,
fig. 5.

Collected by Johansen in abundance from a brackish lagoon west of Martin
point, Alaska, on July 28, 1914; among algae growing on stones in the river bed
at Bernard harbour, on August 16, 1915; by Jessup in lakes in Old Crow river
flats, 40 miles north of New Rampart House, on July 3, 1911.

Trichotria pocillum (Muller).

Trichotria pocillum HARRING, Bull. 81 U. S. Nat. Mus., 1913, p. 106.
A few specimens collected by Jessup in lakes on Old Crow river flats, 40
miles north of New Rampart House, on July 3, 1911.

Trichotria tetractis (Ehrenberg).

Trichotria tetractis HARRING, Bull. 81 U. S. Nat. Mus., 1913, p. 106.

Common in Jessup's collections; pond near New Rampart House, at the
International Boundary and Porcupine river, on June 12, 1911; lakes on Old
Crow river flats, 40 miles north of New Ramaprt House, on July 3, 1911; lakes
48 miles north of New Rampart House, on July 7, 1911; two lakes on Old
Crow river flats, 55 miles north of New Rampart House, on July 10, 1911;
ponds on old Crow river flats 60 miles north of New Rampart House, on July
11, 1911; slough of Old Crow river, near New Rampart House, on August 7,
1912.

12 E Canadian Arctic Expedition, 1913-18

FAMILY TRICHOCERCHXE.
Trichocerca longiseta (Schrank).

Rattulus longiseta JENNINGS, Bull U. S. Fish Comm., vol. 2? (for 1902)
1903, p. 341, pi. 8, figs. 67-72.

Collected by Jessup in a pond near New Rampart House, at the International
Boundary and Porcupine river, on June 12, 1911; lakes on Old Crow river
flats, 40 miles north of New Rampart House, on July 3, 1911; two lakes on Old
Crow river flats, 55 miles north of New Rampalrt House, on July 10, 1911.

Trichocerca mucosa (Stokes).

Rattulus mucosus JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902),
1903, p. 331, pi. 10, figs. 86-91.

A few specimens in Jessup's collections from a slough of Old Crow river,
near New Rampart House, on August 7, 1912.

Trichocerca rattus (Miiller).

Rattulus rattus JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902), 1903,
p. 333, pi. 11, figs. 100, 101.

Collected by Jessup from lakes 48 miles north of New Rampart House, on
July 7, 1911; ponds on Old Crow river flats, 60 miles north of New Rampart
House, on July 11, 1911; small muddy pool, 25 miles north of New Rampart
House, on July 17, 1911; it was rare in all of these collections.

Trichocerca cristata Hairing.

Rattulus carinatus JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902),
1903, p. 332, pi. 11, figs. 95-97.

A few specimens were collected by Jessup from pools at Fort Yukon, on
May 24, 1912.

Trichocerca bicuspes (Pell.).

Rattulus bicuspes JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902),
1903, p. 336, pi. 8, figs. 73-76.

Rare in Jessup's collections from lakes on Old Crow river flats, 40 miles
north of New Rampart House, on July 3, 1911; two lakes on Old Crow river
flats, 55 miles north of New Rampart House, on July 10, 1911.

Trichocerca scipio (Gosse).

Rattulus scipio JENNINGS, Bull. U. S. Fish Comm., vol. 22 (for 1902),
1903, p. 322, pi. 5, figs. 50-52, pi. 13, figs. Ill, 112.

Collected by .Jessup from a muskeg lake, 38 miles north of New Rampart
House, on June 25, 1911.

Diurella porcellus (Gosse).

Collected by Johansen among algae growing on stones in the river bed
at Bernard harbour, on August 16, 1915; by Jessup from lakes on Old Crow
river flats, 40 miles north of New Rampart House, on July 3, 1911; two lakes
on Old Crow river flats, 55 miles north of New Rampart House, on July 10, 1911.

Diurella tenuior (Gosse).

In Jessup's collections from lakes on Old Crow river flats, 40 miles north
of New Rampart House, on July 3, 1911.

R otatoria E 13

Diurella collaris (Rousselet) .

Collected by Jessup from lakes on Old Crow river flats, 40 miles north of
c\Tew Rampart House, on July 3, 1911.

Diurella cavia (Gosse).

A few specimens in Jessup's collections from a pond near New Rampart
House, at the International Boundary and Porcupine river, on June 12, 1911.

FAMILY SYNCILOTID/E.

Synchaeta oblonga Ehrenberg.

Abundant in collections made from the lake at Bernard harbour by Johansen
on May 6 and 7, 1916; same lake south of Bernard harbdur, May 21, 1916.

Synchaeta johanseni, new species.
Plate 1, fig. 3.

The body is fairly slender, bell-shaped and very transparent. Its greatest
width, about mid-length, is one third of the total length. The foot is well
marked off from the body, large at the base and tapers gradually to the very
small toes ; its length is one fourth of the length of the body. The head is tri-
angular and the auricles powerful; on the median line, between the anterior
pair of tactile bristles, there is a tubular sensory organ as in S. vorax Rousselet.
The dorsal antenna is in the normal position; the lateral antennae are near the
posterior end of the body and well towards the ventral side; they are slender
tubules, armed with a minute tuft of setae. The foot glands are very small.
The form and position of the eyespot could not be made out from the preserved
material.

Total length 350 ju; width of body at mid-length 120 ju; length of foot
70 //; length of toes 7 ju-

This species occurred in large numbers in a surface collection made by F.
Johansen on August 23, 1914, at station 36, off Cape Lyon, in Amundsen gulf.

Synchaeta johanseni is closely related to S. vorax Rousselet, from which it
differs in the more slender body, longer and stouter foot, very small foot glands
and minute toes, as well as in the position of the lateral antennae. Its presence
in Amundsen Gulf is of the greatest interest, as up to the present only two species
of rotifers, Synchaeta atlantica and Trichocerca ( = Rattulus) henseni, are known
from oceanic waters; these were both found by Zelinka in the collections of the
German Plankton Expedition from the Atlantic ocean, south of Iceland. While
it would perhaps be incorrect to call Amundsen Gulf an ocean, the conditions
where the collection was made are oceanic, at least as far as salinity and absence
of admixture of fresh water are concerned; there are no rivers of any consider-
able volume discharging near Cape Lyon, and Mr. Johansen informs me that
few of the rivers flowing into the Arctic ocean carry much water in the summer.
How to account for the presence of this rotifer at a single station and its absence
everywhere else is a problem for which no solution can be offered; it may be
noted that the collection contained virtually no other zooplankton, and it is
possible that the absence of enemies may be an important factor in the main-
tenance of this rotifer in such a circumscribed area.

Filinia longiseta (Ehrenberg).

Triarthra longiseta HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 6, pi. 13,fig.6.

Collected by Johansen in a brackish lagoon west of Martin point, Alaska,
on July 28, 1914; lake south of Bernard harbour, November 28, 1915; on May
6, 7, and June 12, 1916.

14 E Canadian Arctic Expedition, 1913-18

FAMILY PLCESOMATID^E.

Ploesoma lenticulare Herrick.

A few specimens in Jessup's collections from lakes on Old Crow river
flats, 40' miles north of New Rampart House, on July 3, 1911; two lakes on Old
Crow river flats, 55 miles north of New Rampart House, on July 10, 1911.

FAMILY TESTUDINELLID^:.
Testudinella patina (Hermann).

In Jessup's collections from pools at White Horse, Yukon Territory, on
June 7 and 11, 1911; lakes on Old Crow river flats, 60 miles north of New Ram-
part House, on July 11, 1911; pools at Fort Yukon, on May 24, 1912.

Testudinella parva (Ternetz).

Collected by Jessup from lakes on Old Crow river flats, 40 miles north of
New Rampart House, on July 3, 1911; two lakes on Old Crow river flats, 55
miles north of New Rampart House, on July 10, 1911.

ORDER FLOSCULARIACEA

FAMILY GONOGHILID^:.

Conochilus hippocrepis (Schrank).

Conochilus volvox HUDSON and GOSSE, Rotifera, 1886, vol. 1, p. 89, pi. 8, fig. 3.

Abundant in Jessup's collections; lakes on Old Crow river flats, 35 miles
north of New Rampart House, on June 23, 1911; muskeg lake, 28 miles north
of New Rampart House, on June 25, 1911; lakes on Old Crow river flats, 40
miles north of New Rampart House, on July 3, 1911; lakes 48 miles north of New
Rampart House, on July 7, 1911; two lakes on Old Crow river flats, 55 miles
north of New Rampart House, on July 10, 1911; ponds on Old Crow river
flats, 60 miles north of New Rampart House, on July 11, 1911.

Conochilus unicornis (Rousselet).

A few specimens in Jessup's collections from lakes on Old Crow river flats,
40 miles north of New Rampart House, on July 3, 1911.

ORDER BDELLOIDA.

FAMILY PHILODINHXE.

Rotaria neptunia (Ehrenberg).

Actinurus neptunius HUDSON and GOSSE, Rotifera, 1886, vol. 1, p. 108,
pi. 10, fig. 6.

Collected by Jessup in a small, muddy pool, 25 miles north of New Rampart
House, on July 17, 1911.

Rotaria rotatoria (Pallas).

Rotifer vulgaris HUDSON and GOSSE, Rotifera, 1886, vol. 1, p. 104, pi. 10,fig.2.
Collected in great numbers by Johansen in a pond at Bernard harbour,
on June 16, 1915.

Rotaria macrura (Ehrenberg).

Rotifer macrurus HUDSON and GOSSE, Rotifera, 1886, vol. 1, p. 107, pi. 10.fig.4.
Very abundant in Johansen's collections from a tundra-swamp at Bernard
harbour, on July 15, 1915, and May 9, 1916.

Rotator ia E 15

BIBLIOGRAPHY.

Beauchamp, P. de.

1913. Rotiferes, pp. 105-116, text figs., in: Deuxieme expedition antarctique francaise.

Sciences naturelles: Documents scientifiques. Polyclades et Triclades maricoles.

Pterobranches. Chetognathes. Rotiferes. 4to. Paris. 116 pp., 9 pis., 1 map,

text figs.
Bergendal, D.

1891. Kurzer Bericht iiber eine im Sommer d. J. 1890 unternommene Reise nach Gronland.

Bihang Svensk. Vetensk. Akad. Hand!., vol. 17, Afd. 4, No. 1, 20 pp.

1892. Beitrage zur Fauna Gronlands. I. Zur Rotatorien-fauna Gronlands. Acta Univ.

Lundensis, vol. 28, sect. 2, No. 4, 180 pp., 6 pis.
Brehm, V.

1910. Die Rotatorien des Sarekgebietes. Verb. Ges. Deutsch. Naturf. u. Aerzte, vol. 81,

pt. 2, 1. Halfte, pp. 190-191.
Bryce, D.

1892. On some moss-dwelling Cathypnadae; with descriptions of five new species. Science

Gossip, London, vol. 28, pp. 271-275, text figs.
1897. Contributions to the nonmarine fauna of Spitsbergen. Part II. Report on the

Rotifera. Proc. Zool. Soc. London, pp. 793-799.
Cleve, A.

1899. Notes on the plankton of some lakes in Lule Lappmark, Sweden. Ofvers. Svensk.

Vetensk. Akad. Forhandl., vol. 56, pp. 825-835, text figs.
Dixon-Nuttall, F. R., and Freeman, R.

1903. The Rotator ian genus DiascMza: a monographic study, with description of a new

species. Journ. Royal Micr. Soc., pp. 1-14, 129-141, pis. 1-4.
Dunlop, M. F.

1901. On a new rotifer, Cathypna ligona. Journ. Quekett Micr. Club, ser. 2, vol. 8, pp.

29-32, pi. 2.
Guerne, J. de, and Richard, J.

1889. Sur la faune des eaux douces du Gronland. Compt. Rend. Acad. Sci., Paris, vol. 108,

pp. 630-632.
1892. Voyage de M. Charles Rabot en Islande. Sur la faune des eaux douces. Bull.

Soc. Zool. France, vol. 17, pp. 75-80.
1892. Sur la faune pelagique des eaux douces de 1'Islande. Compt. Rend. Acad. Sci.,

. Paris, vol. 114, pp. 310-313.
Harring, H. K.

1913. Synopsis of the Rotatoria. Bull. 81 II. S. Nat. Museum. 226 pp.

1914. Report on Rotatoria from Panama with descriptions of new species. Proc. U. S.

Nat. Museum, vol. 47, pp. 525-564, pis. 16-24.
1916. A revision of the Rotatorian genera Lepadella and Lophocharis with descriptions of

five new species. Proc. U. S. Nat. Museum, vol. 51, pp. 527-568, pis. 89-97.
Hudson, C. T., and Gosse, P. H.

1886. The Rotifera or wheel-animalcules, both British and foreign. Vol. 1, VI + 128 pp.,

15 pis., vol. 2, 144 pp., pis. 16-30.
1889. The Rotifera or wheel-animalcules, both British and foreign. Supplement. 64 pp.,

pis. 31-34.
Jennings, H. S.

1903. Rotatoria of the United States. II. A monograph of the Rattulidae. Bull. U. S.

Fish Comm., vol. 22, pp. 273-352, pis. 1-15.
Levander, K. M.

1901. Beitrage zur Fauna und Algenflora der siissen Gewasser an der Murmankuste.

Acta Soc. Fauna et Flora Fennica, vol. 20, No. 8, 35 pp., text figs.
1905. Zur Kenntnis des Planktons einiger Binnenseen in Russisch-Lappland. Festschrift

fur Palmen, vol. 1, No. 11, 49 pp., 3 pis.
Levinsen, G. M. R.

1882. Smaa Bidrag til den gronlandske Fauna. Vid. Medd. Naturh. For., Kjobenhavn,

ser. 4, vol. 3, pp. 127-136, pi. 2, text figs.

1914. Rotatoria. Medd. om Gronland, Kjobenhavn, vol. 23, No. 6, pp. 635-658.
Murray, J.

1908. Arctic rotifers, collected by Dr. William S. Bruce. Proc. Royal Phys. Soc. Edinburgh,

vol. 17, pp. 121-127.
1908. Note on microscopic life in Gough Island, South Atlantic Ocean. Proc. Royal Phys.

Soc. Edinburgh, vol. 17, pp. 127-129.
1910. Antarctic Rotifera. British Antarctic Exped. 1907-1909. Rep. Sci. Invest., vol. 1,

pp. 41-65, pis. 9-13.
1913. South American Rotifera. Part H. Journ. Royal Micr. Soc., pp. 341-362, pis.

13-15.
1913. Notes on the family Cathypnidae. Journ. Royal Micr. Soc., pp. 545-564, pis. 22, 23.

16 E

Canadian Arctic Expedition, 1918-18

Pouchet, G.

1892. Sur la faun6 p61agique du Dyrefjord (Islande). Compt. Rend. Acad. Sci., Paris,

vol. 114, pp. 191-192.

1893. Sur le plancton de la lagune nord de Jan-Mayen. Compt. Rend. Acad. Sci., Paris,

vol. 116, pp. 1207-1208.
Richard, J.

1898. Sur la faune des eaux douces explorers en 1898 pendant la campagne du yacht
"Princesse Alice." (Lofoten, Spitzberg, lies Beeren, Hope, de Barents et Faeroer.)
Me"m. Soc. Zool. France, vol. 11, pp. 326-338, text figs.
Richters, F.

1907. Die Fauna der Moosrasen des Gaussbergs und einiger siidlicher Inseln. Deutsche
Sudpolar-Expedition 1901-1903 (E. von Drygalski ed.), vol. 9, Zool., vol. 1 (pt. 4),
pp. 259-302, pis. 16-20.
Skorikov, A. S.

1904. Beitrag zur Planktonfauna arktischer Seen. Zool. Anz., vol. 27, pp. 209-212.
Voronkov, N. V.

1911. Plankton yodoemov poluostrova la-mala. (Materialy, privezennye la-malskoi
ekspeditsiei B. M. Zhitkova 1908 goda. Kolovratki i obshchaia kharakteristika
planktona.) (Sur le plancton des bassins de la presqu' He de Yamal. Rotiferes et
carateres g6ne>aux du plancton.) (Russian text) Ann. Mus. Zool. Acad. Sci..
St.-Pe"tersbourg, vol. 16, pp. 180-214, 3 maps, text figs.

PLATE I.

Fig. 1. Encentrum algente, lateral view. x!70

2. Encentrum algente, trophi, ventral view.

3. Synchaeta johanseni, dorsal view. x!70.

Rotatoria

El7

PLATE I

18 E

Canadian Arctic Expedition, 1918-18

PLATE II.

Fig. 1. Euchlanis pellucida, dorsal view. x!30.

2. Euchlanis pellucida, lateral view.

3. Euchlanis pellucida, variety A, cross section.

4. Euchlanis pellucida, variety B, cross section.

5. Euchlanis pellucida, variety C, cross section.

Rotatoria
PLATE II.

El9

20 E

Canadian Arctic Expedition, 1913-18

PLATE III.

Fig. 1. Lecane ephestra, dorsal view. x300.

2. Lecane ephestra, ventral view.

3. Lecane jessupi, dorsal view. x300.

4. Lecane jessupi, ventral view.

5. Lecane brachydactyla, dorsal view. x300.

6. Lecane brachydactyla, ventral view.

Rotatoria
PLATE III.

E21

22 E

Canadian Arctic Expedition, 1918-18

PLATE IV.

Fig. 1. Temporary pools in swamp, fed from snow drifts.
Territories, July 2, 1915. Photo by F. Johansen.

Bernard harbour, Northwest

Fig. 2. Valley of Firth river, Alaska-Yukon boundary, showing ponds and flood plain ice
Photograph by International Boundary survey, 141st Meridian, 1912.

Rotatoria

PLATE IV.

Fig. 1.

Fig. 2.

Report of the Canadian Arctic Expedition, 1913-18,

VOLUME VHI: MOLLUSKS, ECHINODERMS, COELEXTERATES, ETC.

MOLLUSKS, RECENT AND PLEISTOCENE.

By William H. Dall.

(Issued September 24, 1919).

Part A:

PartB: CEPHALOPODA AND PTEROPODA.

Cephalopoda. By S. 8. Berry.

Pteropoda. By W. F. Clapp (In preparation).

Part C: ECHINODERMS. By Austin H. Clark (Issued April 6, 1920}.

Part D: BRYOZOA. By R. C. Oshurn (In preparation).

Part E: ROTATORIA. * By H. K. Harring (In press).

Part F: CHAETOGNATHA. By A. G. Huntsman {In preparation).

Part G: ALCYONARIA AND ACTINARIA. By A. E. Verrill (In press).

Part H: MEDUSAE AND CTENOPHORA. By H. B. Bigelow (Issued June SO, 1920).

Part I: HYDROIDS. By C. McLean Fraser (In preparation).

PartJ: PORIFERA.

VOLUME IX: ANNELIDS, PARASITIC WORMS, PROTOZOANS, ETC.

Part A: OLIGOCHAETA.

Lumbriculida3. By Frank Smith.

Enchytraeidsu. By Paul S. Welch (Issued September 29, 1919).

Part B: POLYCHAETA. By Ralph V. Chamberlin (Issued November 20, 1920) .

Part C: HIRUDINEA. By J. P. Moore (Issued February /,, 1921).

Part D: GEPHYREA. By Ralph V. Chamberlain (Issued June SO, 1920).

Part E: ACANTHOCEPHALA. By H. J. Van Cleave (Issued April 7, 1920).

Part F: NEMATODA. By N. A. Cobb (In preparation).

Part G-H: TREMATODA AND CESTODA. By A. R. Cooper (Issued February 4, 1921).

Part I: TURBELLARIA. By A. Hassell (In preparation).

PartJ: GORDIACEA.

Part K: NEMERTINI. By Ralph V. Chamberlin (In preparation).

Part L: SPOROZOA. By J. V. Mavor :(In preparation).

Part M: FORAMINIFERA. By J. A. Cushman (Issued February 6, 19SO)

VOLUME X: PLANKTON, HYDROGRAPHY, TIDES, ETC.

Part A: PLANKTON. By Albert Mann (In preparation).

Part B: MARINE DIATOMS. By L. W. Bailey (In preparation).

PartC: TIDAL OBSERVATIONS AND RESULTS. By W. Bell Dawson (Issued October 1, 1920).

Part D: HYDROGRAPHY. .. (In preparation^.

VOLUME XI: GEOLOGY AND GEOGRAPHY

Part A: THE GEOLOGY OF THE ARCTIC COAST OF CANADA, WEST OF THE KENT

PENINSULA. By J. J. O'Neill (In preparation).

Part B: MAPS AND GEOGRAPHICAL NOTES. By Kenneth G. Chipman and John R. Cox.

(In preparation).

VOLUME XII: LIFE OF THE COPPER ESKIMOS

THE LIFE OF THE COPPER ESKIMOS. By D. Jenness (Issued) .

VOLUME XIII: PHYSICAL CHARACTERISTICS AND TECHNOLOGY OF THE
WESTERN AND CENTRAL ESKIMOS

Part A: THE PHYSICAL CHARACTERISTICS OF THE WESTERN AND COPPER ESKIMOS .

By D. Jenness (In preparation).

Part B: THE OSTEOLOGY OF THE WESTERN AND CENTRAL ESKIMOS. By John Cameron.

\In preparation).
Part C: TECHNOLOGY OF THE COPPER ESKIMOS. *. . (To be prepared).

VOLUME XIV: ESKLMO FOLK-LORE AND LANGUAGE

Part A: FOLK-LORE, WITH TEXTS, FROM ALASKA, THE MACKENZIE DELTA, AND
CORONATION GULF. By D. Jennesa (In preparation) .

PartB: COMPARATIVE GRAMMAR *AND VOCABULARY OF THE ESKIMO DIALECTS
OF POINT BARROW, THE MACKENZIE DELTA, AND CORONATION GULF.
By D. Jenness (In preparation).

VOLUME XV: ESKIMO STRING FIGURES AND SONGS

Part A: STRING FIGURES OF THE ESKIMOS. By D. Jenness. . . . . (Ready for Press).

Part B- SONGS OF THE COPPER ESKIMOS. By Helen H. Roberts and D. Jenness.

(In preparation),

VOLUME XVI: ARCHAEOLOGY

CONTRIBUTIONS TO THE ARCHAEOLOGY OF WESTERN ARCTIC AMERICA.
(To be prepared).