VIVIPARA. 



29 



Pahidina georgiana, Lea — Shell ventricose-conical, Fig. 55. 



thin, dark horn-colored, smooth ; sutures very much 

 impressed ; whirls about five ; convex ; aperture nearly 

 round, white. 



Hopeton, near Darien, Ga. Prof. Shepard ; my cabi- 

 net ; cabinet of Prof. Shepard. Diameter .7, length 

 1.1 inch. 



This species in form resembles most, perhaps, the 

 P. vivipara. It is not quite so large, nor has it 

 bands. It is rather more elevated, and the body 

 whirl is smaller and rounder than the P. declsa, Say. paludina georgiana. 

 The aperture at the base recedes more than is usual 

 with the genus. {Lea.) 



Vivipara georgiana is not a variable species in form. It bears 

 somewhat the same relations to V. conlectoides, as the European 

 V. vivipara does to V. contecta. It is more constrictedly coiled 

 upon its axis, its spire is more pyramidal in shape, its whirls are 

 more flattened, and less angularly bulging at their upper portion. 

 It is constantly truncated at the apex. 



Reeve places Fal. georgiana, together with vivipara, Say, in 

 the synonymy of the European vivipara, as I did in the proof- 

 sheets of this work. The specimens since received have caused 

 me to change my opinion. 



An examination of an authentic specimen of Pal. wareana 

 leaves no doubt in my mind of its identity with V. georgiana. 

 The original description and a fac-simile of one of the original 

 figures here follow : — 



Paludina wareana. — Shell rimately perforate, ventricose, rather thin, 

 subopaque, with delicate concentric lines, olivaceous-ferruginous, thickly 

 streaked with smoke color; whirls 4, inflated, sutures deep; aperture 

 oval, white, ends joined by a thin, glassy callus ; peri- 

 stome straight, sharp. 



Shell somewhat resembling Pal. ohtusa, but is very 

 truncated, rimate, perforate, ventricose, rather thin and 

 transparent, almost opaque ; strise fine ; color olive green 

 blending with iron ; surface broken by numerous curved 

 streaks, sometimes linear, sometimes stronger ; whirls 

 4, slightly increasing; first whirl entirely eroded, the 

 second slightly so in the shell examined ; whirls ventri- 

 cose, sutures moderate; aperture ovate, much shorter pahtdina wareana. 

 than the spire, above modified by the penultimate 

 whirl, reddish within, bluish towards the edge ; parietal wall covered with 

 a thin transparent callus ; columellar slightly curved ; peristome straight, 



Fig. 56. 



