The Productivity of Fish Food in Oneida Lake 165 



*27. Pisidium complanatum Slerki. 



Found sparingly in three hal)itats in water two to 8^ feet 

 deep, on gravel, sand, and mud bottoms. 



28. Pisidium compressum Stcrki. 



A small form, occurring rather plentifully in water one and 

 a half to 14 feet deep, on gravel, sand, clay, and mud bottoms. 



29. Pisidium compressum laevigatum Stcrki. 

 lumnd only on a mud bottom in 13 feet of water. 



30. Pisidium ferrugineum Prime. 



Occurs in water three to 8 feet deep on a sand, clay, or mud 

 bottom. It resembles eastern specimens from New England. 



31. Pisidium henslowanum (Shcppard). Not collected in 



1916. 



*32. Pisidium neglectum Stcrki. 



A few quite small individuals were collected on a mud 

 bottom in 8^ feet of water. 



*33. Pisidium overi Sterki. 



A single valve of this western species was found in a dredg- 

 ing from a mud bottom in 8 feet of water. This species was 

 tirst described from South Dakota and was later found in 

 Minnesota. Its occurrence in New York State extends its 

 range far eastward. 



*34. Pisidium pauperculum .Stcrki. 



Collected on sand and mud bottoms in one and a half to 8 

 feet of water. 



*35. Pisidium punctatum simplex Stcrki. 



A few specimens were found in water from one and a half 

 to three and a half feet deep on sand and sandy clay bottoms. 



*36. Pisidium sargenti Sterki. 



A few quite small individuals were collected on a sand 

 bottom in one and a half feet of water. 

 *37. Pisidium scutellatum Sterki. 



One of the most abundant of these small clams, occurring 

 on gravel, sand, clay, and mud bottoms in water one and a half 

 to 13 feet deep. 



