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. 



