Occasional Papers of the Museum of Zoology 31 



Amnicoud^ 



Amnkola limosa (Say). Habitats: i, 2, 4, 5, 6, 7, 8, lom, 

 32, 34. Very abundant on aqvtatic vegetation and on rocks, 

 in lakes and large streams. 



Aiitnicola limosa porata (Say). Habitats: 4, 8. Some of 

 the shells approximated this form. 



Amnicola lustrica Pilsbry. Habitats: i, 4, 5, 6, 7, 8, lom , 

 2,2, 34. Found with the preceding species. 



Amnicola icalkcri Pilsbry. Habitats: 5, 8. 



AURICUUD.E 



Carychinm exile canadoise Clapp. Habitats: 40, 41, 42, 

 /[-I, 45 , 47, 48. Most abundant on stream flats and in swamps.. 



Carychinm exiguiim (Say). Habitats: 44, 47, 48. Along 

 streams ; much less numerous than preceding. 



Physid.e 



Physa gyriiia Say. Habitats: i, 3, 5, 9, n, 12, 13, 14, 15, 

 18, 23, 24, 25. 26, 27, 28, 30. The most abundant and widel) 

 distributed species of this genus. Most abundant in beaver pond 

 (27) ; very characteristic of creeks. A peculiarly light-colored 

 and transparent form from the beaver pond and the sedge 

 swamp (12). 



Physa Integra Haldeman. Habitats: 2. 3, 4, 5. 7m, Urown 

 Lake. Shells fragile, light horn-colored, with very little color 

 along the inside of the callus. One from the water lily patches 

 (2) measured: alt. 12.4 mm.; g. diam. 8.1 mm.; alt. apert. 

 10. 1 mm. 



Physa Integra var. Habitats: 11. 29, 31, Hanbury Lake and 

 Sturo-eon River. Shells heavy and with varicose lines dis- 

 tinctly marked; almost pure white, but usually covered with 

 a coating of foreign material, tinged with light salmon-yellow 

 inside of callus. An abnormally large example measured: alt. 



