FRESH WATER AND LAND SHELLS. 29? 



I lab. Coosa river, Alabama, Prof. Brumby. Iluntsvillc, Term., Mr. J. Clark. Tennessee, 

 Prof. Troost. 



My cabinet and cabinets of Prof. Brumby and Mr. Clarke. 

 Diam. .28, Length .83, of an inch. 



Remarks. — Among the numerous Melanix sent to me long since by my late friend Prof. 

 Troost, were several specimens of the young of this species. I could not satisfactorily 

 place them in any known species, and I put them temporarily with striatula, (Xobis,) 

 which is strongly allied to the species which I have described above. Recently, I have 

 received from Prof. Brumby and from Mr. J. Clark several adult specimens, which leave the 

 younger in my possession no longer in doubt, — they were recognised at once to belong to 

 those more recently received. All the specimens — some dozen — before me are reddish; 

 the striatula is horn-coloured, with a white aperture. The latter is also flatter in the 

 whorls, and not so carinate above, nor are the sutures so deeply impressed. Some of the 

 specimens are quite smooth on the body whorl. Aperture about one-third the length of 

 the shell. 



Melania sculptilis. PI. XXX. Fig. 3. 



Testa perstriatd, conoided, sublenui, corned; spird acuminata, ad apicem carinatd el granidald ; suturis 

 irregulariter impressis; anfraclibus decim, subplanulatis ; striis crebris el into- sculpturatd ; aperlurd parvd, 

 ellipticd, ad basim angulatd, intus albidd; columella incurva tortdque. 



Shell thickly striate, conical, rather thin, horn colour; spire pointed, towards the apex carinate and granulate; 

 sutures irregularly impressed ; whorls ten, rather flattened; striae close, and between them sculptured; aperture 

 small, elliptical, angular at base, white within; columella incurved and twisted. 



Hab. Tennessee, Mr. J. Clark. 



My cabinet and cabinet of Mr. Clark. 

 Diam. .24, Length .55, of an inch. 



Remarks. — Two specimens arc before me, which are precisely alike. It is a very 

 remarkable species, having regular and close stria? over the whole of the lower whorls, 

 between which stria; there is a double row of minute indented marks, very close to each 

 other, and only visible with a lens. I have seen no such marks on any other species. 

 In outline it is closely allied to striatula, (Xobis,) but it is a smaller species, and has not 

 the cancellation of that species. The aperture is rather more than one-third the length 

 of the shell. The outer lip is broken. 



Melania Clarkii. PI. XXX. Fig. 4. 



Testa plicatd, claviformis, subtenui, tenebroso-fuscd ; spird elevatd, attenuatd; suturis subimpressis} 

 anfraclibus planulatis; aperlurd pun-,), subelliplicd, ml basim angulatd, intus tencbrosd ; columelld torld. 



£hell folded, club-shaped, rather thin, dark brown ; spire elevated, drawn out; sutures somewhat impressed; 

 whorls flattened; aperture small, rather elliptical, at the base angular, within dark ; columella twisted. 



I lab. Duck Crei k, Tenn., Mr. Joseph Clark. 



My cabinet mid cabinet of Mr. Clark. 

 Diam. .2:;, Length .73, of an inch. 



