232 Wisconsin Academy of Sciences, Arts and Letters. 
Genus Quadrula (Rafinesque) Agassiz. 
11. Quadrula undulata (Barnes). 
Station XX 1 . Only one specimen found. 
Order TELEODESMACEA. 
Superfamily Cyrenacea. 
Eamily Sphaeriidae. 
Genus Sphaerium Scopoli. 
12. Sphcerium sttialinum (Lamarck). 
Station XX 2 . Common on sandy bottom, near high- 
water line. 
13. Sphcerium simile. (Say). 
Station III. A single valve of this species was found 
on the lake share. 
14. Sphcerium occidentale. Prime. 
Station XXI. Common and typical in swamps border¬ 
ing the Wisconsin River. 
Genus Musculium Link. 
15. Musculium partumeium (Say). 
Station XXI. All the specimens secured were imma¬ 
ture. 
16. Musculium securis (Prime). 
Stations II 2 , Y, XY. The specimens secured are all 
rather small, none exceeding seven mill, in length. All 
were collected in swampy bays or ponds. Xot mentioned 
in Chadwick’s list. 
17. Musculium rosaceum. (Prime). 
Station XYII. A frequent species in the small pools 
which occupy most of the kettle holes in this region. 
Genus Pisidium Pfeiffer, 1824. 
18. Pisidium abditum Hald. 
Station II 2 , XYII. Common and variable. 
19. Pisidium roperi Sterki. 
Station XYII. Common associated with the last spe¬ 
cies. 
