28 



VIVIPARA. 



for genicula. Mr. Conrad's description is as follows, 

 is a fac simile of his. 



Fiff. 45 



Fig. 45. 



Paludina genicula. 



Fig. 46. 



Fig. 47. 



Paludina genicula. — Shell suboval, spire slightly ele- 

 vated ; volutions 4, scalariform, shoulders angulated ; 

 apex eroded, aperture rather more than half the length 

 of the shell ; epidermis green olive ; within bluish. 



A species which is readily distinguished from those 

 nearest allied to it by the angulated whirls. I found 

 a single specimen in Flint River, Ga. {Conrad.) 



Lymnula ventricosa, Rafinesque, of whose 



description and figure (fig. 46) a copy is Here 



given, is evidently this species. 



His figure, though very rough, is 



quite characteristic. 



Lymnula ventricosa. — Whirls 4, last 

 one very large ; form obtuse-oval ; 

 aperture bluntly oval, &c. (Bajines- 

 que.) 



From the same MS., " Con- 

 chilogia Ohioensis," which was 

 kindly loaned me by Prof. Haldeman, I find 

 rough figures (fig. 4*7) of Viv. clecisa under the 

 name of Amhloxis, Amblosioma, ov Lymnulus major, Rafinesque, 

 or Lymnea eburnea, Rafinesque. All these names are given, 

 and I find it impossible to decide which was the one finally fixed 

 upon, or to decipher more of the description than the follow- 

 ing :— 



Whirls 5, last very large, form obtuse oval, aperture obtuse oval, lip 

 thickened within, columella covered with callus. {Rafinesque.') 



Paludina suhsolida, Anthony, appears to me also a synonym 

 of this species. My opinion is founded on an examination of 

 Mr. Anthony's specimen, kindly lent me for figuring (fig. 48). 

 His description here follows. 



Paludina suhsolida, K^rs-O^f. — Shell ovate, imperforate, very thick; color 

 light green, verging to brown in old specimens ; spire much elevated, com- 

 posed of 6 — 7 inflated whirls ; sutures very distinct ; aperture broad-ovate, 

 about one-third the length of the shell, within white ; lip curved forward 

 and forming a very conspicuous, subacute tip near its base ; columella 

 well rounded, a thick callous deposit covering the umbilicus. Length 2 

 inches, breadth 1\ inches. 



Lymnea eburnea, 

 Kaf. 



