19 



Lingual dentition of V. intertextn. 



Fig. 29 represents the lingual dentition of V. intertexta. 

 There are forty-eight rows of seven teeth each, the first fifteen or 

 sixteen of a smoky claret color. 



The male and female of this species are respectively represented 

 in Figs. 31 and 30. 



Fig. 30. 



Fig. 31. 



Female of V. intertexta. 



Male of V. intertexta. 



Fig. 32. 



Tivipara siiljpurpurea, Say.— Shell oblong, subovate, oliva- 

 ceous, with a tinge of purple more or less intense, some- 

 times hardly perceptible ; spire rather obtuse, termi- 

 nating convesly ; whirls five, wrinkled, equally convex ; 

 suture impressed, but not very profoundly ; aperture 

 much widest in the middle, narrower above ; within 

 glaucous, somewhat perlaceous ; labrum rectilinear 

 from the middle upwards ; umbilicus none. Length 

 about one inch, greatest breadth four-fifths of an inch. 

 An inhabitant of Fox River, an arm of the Wabash. 

 Pal. suhpurpurea. It is very distinct from any other species I have seen. 



