BITHYNIA. 41 



in those better developed. Anodon angidatus is also found abundant in 

 this river, &c. (^Hincls.) 



Paludina seminalis, Hixds, Voy. of the Sulphur, p. 54, pi. xvi, f. 22 ; 

 Arch. f. Nat. 1843, II, 130. (Vide also Annals Nat. Hist. x. 83.) 



The above is the original description and a copy of the figure 

 of Hinds (fig. 81). Haldeman (Leptoxis, p. 156) refers Palu- 

 dina seminalis to Pal. NuttaUiana, Lea, which is placed doubt- 

 fully in Lejotoxis. 



Bitliynia tentaculata, Lin.— This early known shell is thin, 

 semitransparent, quite smooth, shining, and of a fulvous horn color ; in 

 shape it ranges from ovate-acute to oblong-acute, but the latter form is by 

 far the less frequent. It is composed of 5 volutions, of which the body 

 whirl, when viewed dorsally, is equal to the rest collectively, and whilst 

 they are only moderately convex (and sometimes only slightly so), is gen- 

 erally more or less ventricose. The more produced is the shell, the less 

 convex are the turns. The suture is distinct but fine, and the whirls, 

 instead of jutting out abruptly, as in Lcachil, shelve gently downwards. 

 The general proportion of their breadth to their height is as two to one. 

 The apex is very small, and rather pointed ; the enlargement of the suc- 

 ceeding volution is sudden. There is no true umbilical cavity, but at most 

 a slight crevice behind the pillar lip, which latter is narrow, somewhat 

 appressed, and not dilated anteriorly. The aperture is subpyriformly ovate 

 or obovate, being contracted to a point at its posterior extremity. It occu- 

 pies 3-7ths of the entire length of the shell, and not half of the greatest 

 breadth. The outer lip is somewhat disposed to expand, and is slightly 

 thickened within by a white ridge, which forms a support for the opercu- 

 lum. Our largest specimen measures a third of an inch in breadth, and 

 rather more than half an inch in length. {Forbes ^- Hnnley.) 



The above is the description given of this species in England 

 by Forbes and Hanley, Brit. Moll. Ill, p. 14. It is quoted from 

 Greenland by Moller, &c. I have seen no specimen, but the de- 

 scription given will cause it to be recognized if found. Fig. 19, 

 page 46, represents the animal. 



Bithynia castanea, MiJLL. — This species is also referred to 

 Greenland. I have seen no specimen of it. 



