The Productivity of Fish Food in Oneida Lake i6i 



In a previous paper (Baker, 'i6, p. 252, fig. 40, no. 4) Mar- 

 garitana margaritifera is listed from the lake. This reference 

 was founded on a few specimens of mussels in which the 

 lateral teeth were wanting- or but feebly developed, the cardinal 

 teeth were much reduced and the adductor muscle scars were 

 strongly roughened. Material collected during the 1916 field 

 season contained a number of these shells and also many with 

 well-developed lateral teeth and other characters showing that 

 these shell were erroneously referred to Margaritana and that 

 they were abnormal or pathologic forms of ElUptio compla- 

 natus. Specimens were submitted to Dr. Bryant Walker who 

 declared them to be ElUptio. These shells may occur in almost 

 any lot from almost any locality. Margaritana is therefore to 

 be taken from the list of Oneida Lake shells. 



Genus Anodonta Lamarck 



2. Anodonta marginata Say. Not collected in 1916. 



3. Anodonta cataracta Say. 



This characteristic paper-shell occurs in water from 3 to 8 

 feet deep and on all varieties of bottom. It is the commonest 

 Anodonta in the bay and vicinity. 



4. Anodonta implicata Say. 



Found only on an exposed shore in water two and a half to 

 four feet deep, in sand between boulders. 



5. Anodonta grandis Say. Not collected in 1916. 



6. Anodonta grandis footiana Lea. 



Footiana occurred in water from one and a half to 15 feet 

 deep and on all kinds of bottom, except boulder bottom. 



Genus Alasmidonta Say 



7. Alasmidonta undulata (Say). Not collected in 1916. 



Genus Strophitus Rafinesque 



8. S-trophitus edentulus (Say). Not collected in 1916. 



9. Strophitus undulatus (Say). Not collected in 1916. 



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