l4eE Canadian Arctic Expedition, 1913-18 
FAMILY PLQ@SOMATIDA. 
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 CONOCHILIDA. 
Conochilus hippocrepis (Schrank). 
Conochilus voluox Hupson and Gossn, Rotifera, 1886, vol. 1, p. 89, pl. 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 PHILODINIDA. 
Rotaria neptunia (Ehrenberg). 
Actinurus neptunius Hupson and Gossx, Rotifera, 1886, vol. 1, p. 108, 
pl. 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 Hupson and Gossr, Rotifera, 1886, vol. 1, p. 104, pl. 10,fig.2. 
Collected in great numbers by Johansen in a pond at Bernard harbour, 
on June 16, 1915. 
Rotaria macrura (Ehrenberg). 
Rotifer macrurus Hupson and Goss, Rotifera, 1886, vol. 1, p. 107, pl. 10.fig.4. 
Very abundant in Johansen’s collections from a tundra-swamp at Bernard 
harbour, on July 15, 1915, and May 9, 1916. 
