Rotator ia E 11 



Lepadella patella (Miiller). 



Lepadella patella HARRING, Proc. U. S. Nat. Mus., vol. 51, 1916, p. 539, 

 pi. 90, figs. 1-12; pi. 91, figs. 1, 2. 



This species is widely distributed in the Arctic, but apparently in small 

 numbers; it was collected by Johansen among algae in the 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 HARKING, Proc. U. S. Nat. Mus., vol. 51, 1916, p. 

 546, pi. 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 ehrenbergii HARRING, Proc. U. S. Nat. Mus., vol. 51, 1916, p. 553, 

 pi. 94, figs. 1-4. 



In Jessup's collections from lakes on Old Crow river flats, 40 miles north of 

 New Rampart House, on July 3, 1911. 



Colurella colurus (Ehrenberg). 



Colurus amblytelus HUDSON and GOSSE, Rotifera, 1886, vol. 2, p. 104, pi. 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 (Muller). 



Trichotria pocillum HARRING, Bull. 81 U. S. 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. S. 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. 



