84 



THE NAUTILUS. 



all kinds of bottom and in all depths of water examined. The 

 deeper water individuals run considerably smaller than those 

 from shallow water. 



Anodonta cataracta Say. On all kinds of bottom in 3-8 feet of 

 water. 



Anodonta implicata Say. Found only on exposed shores in 

 water two and a half to four feet deep, in sand between boulders. 



Anodonta grandis footiana Lea. Occurs on all kind of bottom 

 except boulder in water one and a half to 15 feet deep. 



Lampsilis luteola (Lam.). On all varieties of bottom except 

 gravel in water 3-18 feet deep. 



Lampsilis radiata (Gmelin). Found only in water one and a 

 half to three feet deep on boulder, gravel, and sand bottom. 

 Typical radiata is very rare in Oneida Lake. 



Lampsilis radiata oneidensis Baker. Common in water from 

 8-18 feet deep on gravel and mud bottom, usually the latter. 

 This species replaces Lampsilis borealis (Gray) 1 which does not 

 occur in Oneida Lake. 



Sphaeriidae. 



Sphserium vermontanum Prime. The most abundant of these 

 small clams, occurring in water from one and a half to 14 feet 

 deep and on all varieties of bottom except boulder. 



Sphderium solidulum (Prime). Occurs sparingly in water 8-18 

 feet deep on a mud bottom. Dr. Sterki characterizes it as a 

 small eastern form. 



Spharium sulcatum (Lam.). Found only on a mud bottom 

 in 8-13 feet of water. It is the rarest of these small clams and 

 is a small, slight form, quite unlike the large heavy individuals 

 found in other parts of New York State. It is an interesting 

 case of bath y metrical distribution that vermontanum should oc- 

 cur at all depths examined but that solidulum and sulcatum 

 should be found only at 8 feet and deeper. The last mentioned 

 species was obtained only between 8 and 13 feet. 



Musculium truncatum (Linsley). Clay bottom in four feet of 

 water. 



x See Technical Bulletin, IV, page 257; Nautilus, XXX, pages 74-77, 

 1916. 



