PLEUROCERA. 51 



Mdania inrnodosa.— Shell tuberculate, conical, rather thick, horn- 

 color, striate below; spire elevated, ribbed on the apex; sutures 

 undulated; whorls eight, flattened, tuberculate on the in- Fig. 1 00. 

 ferior portion; aperture small, angular and canaliculate 

 at the base, Avithin white. 

 Habitat.— Cypress Creek, Florence, Alabama. 

 Diameter, -4 ; length, -08 of an inch. 

 Observations.— Thi?, is a very remarkable species, having numerous, 

 somewhat oblique tubercles, thickly set in a single row on the mid- 

 dle of the whorls. In the specimen before me, the only one I have 

 seen, there is a dark spot between each of the tubercles. Towards 

 the apex, the tubercles are more elongate and closely set, so as 

 absolutely to become ribs across the whole of the whorl. The aper- 

 ture is rather more than one-third the length of the shell. The stris 

 on the inferior half of the whorls are very regular and 

 distinct, and number eight in this specimen. — L"a. 



Melania torqnata. — Shell tuberculate, subfusiform, shin- 

 ing, rather thiu, yellow; spire rather elevated; sutures 

 inipi-essed; whorls seven, somewhat convex; aperture 

 elongated, angular at the base, within whitish. 

 Habitat. — Tennessee. 

 Diameter, -42 ; length, -80 of an inch. 

 Observatioiis. — This is a very beautiful species, of which I have only 

 one specimen before me. The necklace-like row (whence its name) of 

 small closely set tubercles, gives it an attractive appearance. Each 

 successive whorl covers up these tubercles as well as several stride 

 below them, leaving the whole spire smooth. The aperture is rather 

 contracted, and nearly half the length of the shell. The outer lip is 

 sharp, and very much curved. It has some resemblance to M. alveare 

 (Conr.) but is a larger shell, less solid, and more fusiform. — Lea. 



The 3'oung of the large specimen figured, having attained to 

 the full size of the ordinary adults and still differing from 

 them, has been described as distinct by both Messrs. Lea and 

 Anthony. Copies of theirdcscriptions are given below. Hav- 

 ing examined numerous specimens I have no doubt of their 

 identity with alveare. 



As already mentioned, Strejyhoha.-iis j)itwi<7a, Lea, is closely 

 allied in general appearance to alveare. 



Mr Lea believes alveare to be a Lithasia^ but I do not find 



