FAUNA OF THE ALEUTIAN ISLANDS AND ALASKA PENINSULA 391 



Cyclops serrulatus, with a cosmopolitan distribution. The same is true of most 

 of the Cladocera, the majority of which are common to Europe, Asia and 

 America. However, even in the case of widely distributed forms it is 

 interesting to determine their existence as part of the local fresh-water 

 fauna." 



Trevor Kincaid has recently (1953) published a report which 

 mentions the 1937-38 Aleutian collection of plankton crustaceans. 



CRUSTACEANS 



CLADOCERANS 



Daphnia pulex (de Geer) 



Daphnia longispina (0. F. Miiller). 



Bosmina obtusirostris Sars 



Macrothrix hirsuticornis Norman and Brady 



Alona rectanguki Sars 



Pleuroxus denticulatus Birge 



Chydorus sphaericus (0. F. Miiller) 



Chydorus latus Sars 



Alonella nana (Baird) 



COPEPODS 



Eurytemora affinis Poppe 

 Arctodiaptomus kurilensis Kiefer 

 Diaptomus ashlandi Marsh 

 Diaptomus shoshone var. ivardi Pearse 

 Diaptomus eiseni Lilljeborg 

 Cyclops (Acanthocy clops) viridis Jurine 

 Cyclops (Cyclops) strenuus Fischer 

 Cyclops (Eucyclops) serrulatus Fischer 



OSTRACODS 

 Cyclocypris sp. 



MOLLUSKS 



Eleven species of mollusks were collected from fresh-water 

 pools and lakes. All of them were small bivalves or snails found 

 clinging to submerged vegetation or in the bottom mud ; none were 

 as large as the fresh-water mussels of the mainland. A full list 

 of the species collected is as follows : 



Fossaria truncatula, Gyraulus deflectus, Menetus opercularius 

 planulatus, Pisidium abditum?, Pisidium liljeborgi, Pisidium 

 ovum?, Retinella binneyana pellucida, Sphaerium tenue, Stagni- 

 cola atkaensis (9 out of 12 were infested with trematode rediae), 

 Stagnicola randolphi, Stagnicola yukonensis atlinensis. 



