VIVIPARA. 41 



less incrnsted with tlie oxide of iron. The aperture is inflated, and about 

 three-fourths the length of the shell. 



I am not positively sure that this species came from Ohio. By some 

 accident the label has been misplaced, but I am under the impression it 

 came with some other species from my brother at Cincinnati. (Lea.) 



Puludina recjularis, Lea, Tr. Amer. Phil. Soc, IX, 13 (1844). Obs. IV, 

 13, 1841. Proc. II, 34 (1841). Arch. f. Nat., 1843, II, 130. 



From the specimens labelled by Mr. Lea in the Smithsonian 

 collection, it does not appear to me that this species is as well 

 characterized as the others found in this country. Still, in the 

 present state of our knowledge of the genus, I cannot 

 place Mr. Lea's name in the synonymy of any other ^^^ ' 

 species. His original specimens are much better 

 marked. The figure is drawn from one kindly given 

 me by Mr. Lea, and is thus characterized. The spire 

 is extremely short, flattened, but well defined quite to 

 the acute apex ; the sutures are impressed ; the body 

 whirl comprises more than five-sixths of the complete length of 

 the shell ; the aperture is almost as long as the body whirl, and 

 so wide that the length and breadth of the shell are almost equal ; 

 the shell is remarkably globose, almost circular. I have often 

 met in cabinets with immature specimens of Viv. ponderosa 

 under this name. 



See remarks on Pal. obesa, under Viv. decisa. 



Found also in Illinois and Ohio. 



Tivipara sullglolbosa, Sat — Shell subglobose ; whirls three and 

 a half, much rounded, rapidly enlarging ; suture profoundly impressed ; 

 aperture subovate ; umbilicus very narrow, nearly closed by the 

 labrum ; spire very short, convex. Fig. 74. 



Inhabits the Northwestern Territory. Length less than three- ^^^ 

 tenths of an inch. f -^J^ 



I obtained this shell when traversing the northwestern part of ^\_y 

 the Union. It is much larger than the porato, nob., which it pai.sub- 

 resembles considerably, but its whirls are much more rapidly globosa. 

 enlarged, and the umbilicus is much narrower. 



Paludina suhglohosa, Say, 1825, J. A. N. S., V, 125 ; Binney's ed. p. 115. — • 

 DeKay, N, Y. Moll., p. 86 (1843).— Haldeman, Mon., pi. s, f. 7, 8. 



Say's type is still preserved at the Philadelphia Academy. 

 Fig. 74 is taken from it. It does not appear to me to belong 

 properly to this genus, but rather to the same group of Leptoxis 

 as L. isogona, pallida, altalis, &c. 



