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. 



