MELANTHO. 



51 



Paludina heros, DeKay, of one of the earlier Zoological .Re- 

 ports of Xew York i.s said by that author to be a large form of 

 Fal. Integra. (N. Y. Moll. p. 85.) 



Fig. 105 represents the lingual dentition of M. integra. 

 Lingual membrane composed of forty- 

 eight rows of teeth, arranged in the ^^'' 

 form common to the group 3, 1, 3. j:^^^^\'^^^ 

 Central tooth broad, short, and hooked, 

 a small shoulder each side near its base ; 

 first lateral broad and hooked ; second 

 and third lateral long, claw-shaped ; anterior part of membrane 

 broad, narrowing toward the middle, and again widening at its 

 posterior portion. First twelve or fourteen rows translucent 

 brown in color, the rest colorless. 



The animal of this species is given in Fig. 68, p. 35. 



Lingual dentition of 3/. integra. 



