8E 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 125y; length of dorsal plate 84u, width 88u; length of ventral 
plate 90u, width 604; width of anterior points 54u; length of toes including 
claws 36y, length of claw 6y. 
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 Mier. Soc., 1913, p. 553, pl. 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 Dunuop, Journ. Quekett Micr. Club, ser. 2, vol. 8, 1901, 
p. 29, pl. 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 hornemannit Murray, Journ. Royal Mier. Soc., 1918, p. 349, pl. 
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. 
