Rotatoria Ell 
Lepadella patella (Miller). 
; Lepadella patella Harrine, Proc. U. 8. Nat. Mus., vol. 51, 1916, p. 539, 
pl. 90, figs. 1-12; pl. 91, figs. 1, 2. 
This species is widely distributed in the Arctic, but apparently in small 
numbers; it was collected by Johansen among algae inthe 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 Harrine, Proc. U. 8. Nat. Mus., vol. 51, 1916, p. 
546, pl. 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 ehrenbergit Harrine, Proc. U.S. Nat. Mus., vol. 51, 1916, p. 553, 
pl. 94, figs. 1-4. 
In Jessup’s collections from lakes on Old Crow river flats, 40 miles north of 
New Rampart House, on July 38, 1911. 
Colurella colurus (Ehrenberg). 
Colurus amblytelus Hupson and Gosss, Rotifera, 1886, vol. 2, p. 104, pl. 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 (Miiller). 
Trichotria pocillum Harrine, Bull. 81 U. 8. 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. 8. 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. 
