18 



VIVIPARA. 



me to consider tliem identical. With his original description of 

 the latter I have given figure 24 from his type, while below will 

 be found the description of Pal. Elliotti and a figure (25) of a 

 specimen presented me under this name by Mr. Lea and now in 

 the Smithsonian collection. 



I have seen no authentic specimen of Pal. contorta, but believe 

 a study of Kiister's description given below, and the copy of his 

 figures (fig. 26) will convince one of its identity with Mr. Lea's 

 shells. 



Fig. 25. Paludina ElUotii, Lea, (1. c.) — Shell subcari- 



nate, pyramidal, rather thick, greenish-olive, 

 smooth, very narrowly umbilicated ; spire ele- 

 vated, subacute, flesh-colored at the apex ; sutures 

 excavated ; whirls 7, rounded, obtusely carinated 

 above, rather small ; aperture subrotund, small, 

 white within. 



Othcalooga Creek, Ga. Bishop Elliott. {Lea.) 



Paludina contorta, Shuttlewoeth, (1. c.) — Shell 

 non-rimate, cylindrically conic, subovate, shining, greenish with olive lines ; 

 apex eroded ; whirls 6, strongly convex, divided by a deep suture, the mid- 

 dle ones carinated in the middle ; aperture oblong, 

 white ; peristome straight, acute, curved above. 



Shell smooth, cylindrical-conic, turretted with a 

 truncated apex ; shining, green, with olive brown 

 lines and striae ; sutures deep ; whirls 6, ventricose, 

 moderately increasing above, rapidly so towards 

 the base, the middle ones clearly carinate in their 

 centre, with brown angular curving stria and lines 

 at the middle keel ; last whirl shorter 'than the 

 Paludina contorta. penultimate, and near the upper portion of the 

 aperture separated so as to form a deep groove of 

 the suture. Aperture longitudinally rounded, inner lip appressed ; peri- 

 stome straight, acute, twisted above (fig. 9), curving again below its centre, 

 beautifully rounded below and regularly blending with the columella. 

 Height 8'", breadth 5 "'. 

 Alabama (Rugel), coll. Charpentier. (Kiister.) 



Vivipara elliotti. 



Fig. 26. 



Vivipara suljcarinata, Sat— Shell with three 

 whirls, which are rounded, and subcarinated, reticulated 

 with strise and wrinkles, sometimes without the striae ; suture 

 deeply impressed ; apex truncated and re-entering ; aperture 

 more than half of the length of the shell, oval ; elevated lines 

 or subcarinae on the body two, three, and sometimes none. 

 Length half of an inch, breadth four-tenths. 



