GONIOBASIS. 223 



but it does not answer to his description. It is allied to Melania 

 {(roniohasis) mellea (nobis), but differs in being more regularly fusi- 

 form, in not being so much inflated, nor having so sharp an apex, and 

 the Avhorls are flatter. The interi(|r of this specimen is slightly dis- 

 posed to yellowness. There is no appearance of bands on this spec- 

 imen, and I doubt if it will be found banded. The aperture is nearly 

 one-half the length of the shell. I dedicate this species to my friend, 

 n. Bridges, M.D., who has done so much to promote the knowledge 

 of our zoology. — Lea. 



I doubt whether this is more than an adult form of angidata, 

 Anth. 



111. G. cubicoides, Anthoxy. 



Melania cvbicoides, Anthony, rioc. Acad. X:it. Sci.,p. 60, Feb., 1830. TJinket, 

 Check List, Xo. 78. Brot, List, p. 39. Reeve, Monog. Melania, sp. U'). 



Description. — Shell ovate, smooth, thick ; whorls G-7, flat, the upper 

 ones rapidly enlai'ging to the body-whorl, which is broad and acutely 

 angulated; sutures distinct, rendered more so by a sharp cariuation 

 on the lower part of each whorl; aperture broadly ovate. Fig. 444. 

 within whitish; columella deeply indented; sinus small. 



Habitat. — Wabash Eiver, Indiana. 



Observations. — One of the short, thick species, in form not 

 unlike M. cnspidata (nobis), bntdiflcring by its sharp, cari- 

 nated body-whorl and imbricated spire; the body-whoi'l is 

 also strongly striate and obscurely ribbed ; these longitudinal ribs are 

 very faint, but sufficiently distinct at the sharp carina, near the 

 summit of the aperture to modify its outline into a waving, subnod- 

 ulous line. — Anthony. 



Figured from Mr. Anthony's type. The longitudinal ribs 

 alluded to by Mr. Anthony arc very indistinct in Iiis typo 

 specimen, and do not exist in other specimens j both old and 

 3'oung, before me. 



112. G. Spillmanii, Lka. 



C'oniohasis .Spillmanii, Lea, Troo. Acad. N:it. Sci., p. 2G4, 18^2. Journ. Acad. Xat. 

 S i.. V, pt. 3. p. .302, t. 37, f. 138, March, 1SC3. Obs. ix, p. 134. 



D'scription — Shell smooth, fusiform, thin, greenish hnrn-rolor, 

 shining, without bands; spire obtusely conical; sutures linear; 



