40 VIVIPARA. 



Fig. 71. have seen no connecting links between them, though 

 I have examined numerous young individuals of 

 Viv. inagnifica. 



Fig. 71 is drawn from the original specimen of 

 Mr. Lea. No. 89i9 of the Smithsonian collection 

 Vivipara coosa- was labelled by Mr. Lea. 



ensis. 



Tivipara decapitata, Anthony — Shell globular, tliin, of a light 



green color ; spire truncate, but never elevated under any circumstances, 



composed of about four very flat whirls ; aperture broad, 



Fig. 72. ovate, one-half the length of the shell, within dusky white ; 



columella regularly but not deeply rounded, with a slight 



deposit of callous, and having a very small linear umbilicus 



at base. 



Tennessee. My Cabinet. 



A single specimen only is before me, and therefore I 

 Vivipara ... . . 



decapiUda claim it as a new species with some hesitation ; it seems 



to me, however, too unlike any of the ordinary forms in 



this genus to warrant its being included with any of them ; it is the 



most globose of any species hitherto published, if we except the small, 



round forms which were long since removed, and very properly too, to 



Amnicola; the spire is entirely wanting, but traces of the sutures show 



the number of whirls ; and its present appearance forbids the idea of its 



ever having had an elevated spire. (^Anthony.) 



Paludina decapitata, Anthony, Proc. Acad. Nat. Sci., Phil. 1860, p. 71. 



To the copy of the description of Mr. Anthony given above, I 

 am able to add Fig. 72, drawn from the type, which he kindly 

 loaned me for the purpose. I do not consider this a well-estab- 

 lished species. The single specimen on which it is founded is 

 evidently an undeveloped specimen in a very imperfect state. 

 The spire is eroded, the shell presents the appearance of belong- 

 ing to a small ill-favored individual of V. decisa. However, the 

 only information we have regarding it, given above, may serve to 

 identify it, should it appear in future. 



Vivipara regularis, Lea — Shell subglobose, rather thick, green- 

 ish horn color, imperforate ; spire very short ; sutures impressed ; whirls 

 five, convex ; aperture large, ovate, within bluish. 



Ohio ? T. G. Lea. My cabinet, and cabinet of T. G. Lea. Diam. .38, 

 length .52 inch. 



A very distinct species with the body whirl about four-fifths the length 

 of the shell. The whirls are very regular, giving the spire somewhat the 

 appearance of a coil of rope. All the specimens before me are more or 



