The Relation of Mollusks to Fish in Oneida Lake 271 
(Vaucheria) upon which it was apparently feeding. 
Recorded by Beauchamp. Eaten by the Common Whitefish, 
Round Buffalo, Common Sucker, Common Red Horse, 
Placopharynx, Golden Shiner, Common Bullhead, Pumpkin- 
seed, and Yellow Perch. 
41. Valvata bivarinata normalis Walker. Fig. 45, Nos. 
13-15. 
Observed at five stations where it lives in shallow water 
on a sandy bottom in a more or less protected bay or in 
vegetation in a protected bay. It is eaten by the Pumpkin- 
seed. Bicarinata is not listed by either Letson or 
Beauchamp. 
The carinate Valvatas are widely distributed, occurring 
from New England to Iowa, and from Manitoba southward. 
Tricarinata was collected at Isle Royale in mud in deep 
water (p. 294), and varieties of tricarinata in the Saginaw 
Bay region in shallow water on a sandy, gravelly and marly 
bottom. In the Georgian Bay region, tricarinata is said to 
be common on sandy or muddy bottoms in weedy places and 
on sandy bottoms to a depth of 20 fathoms. 
Fig. 45. 1-3, Planorbis hirsutus ; 4-6, Planorbis parvus; 7-9, Planorbis 
exacuous ; 10-12, Valvata tricarinata; 13-15 Valvata bicari- 
nata normalis; 16, Ancylus fuseus; 17, Ancylus parallelus ; 
18, Ancylus tardus; 19, Amnicola limosa; 20, Amnicola 
lustrica ; 21, Amnicola lustrica, var; 22, 23, Bythinia tenta- 
culata; 24, Succinea avara; 25, Pisidium variabile ; 26, 
Pisidium compressum levigatum ; 27,Pisidium compressum ; 
28, Pisidium cquilaterale; 29, Musculiwm securis; 30, 
Musculium rosaceum; 31, Spharium striatmum; 32-33, 
Spherium vermontanum; 34-35, Physa ancillaria war- 
reniana; 36, Physa integra; 37, Pseudosuccinea columeila 
chalybea; 38, Pseudosueccinea columella; 39, Gillia altilis ; 
40, Somatogyrus subglobosus; 41, Physa gyrina; 42, Acela 
haldemani; 43, Galba palustris; 44, Helicopsyche borealis. 
3, 6, 9, 12, 15, enlarged about twice natural size; 16-18, 25— 
33, slightly enlarged. 
