GONIOBASIS. 323 



Oliservntions. — The regularly elliptical outline of this species is 



remarkable among the Goniobases. There is no appearance of bands 



in either of the three specimens sent by Dr. Showalter. One of 



them has a slight line of brown in the callus of the inte- 



Fig. C21. 

 rior above. The largest specimen has some indistinct 



striffi towards the base of the whorl. It is nearly allied to 



Melania olivula, Conrad, but it is more inflated and has a 



shorter spire. The aperture is more than half the length 



of the shell. — Lea. 



I cannot detect any difference between ^he two species in- 

 cluded in tlie above s^'nonymy except that luteola appears to 

 be not fully grown. For this reason I give the description of 

 straminea first, as being that of the adult shell. 



The following is the description of 



Goniobasis luteola. — Shell smooth, elliptical, rather thin, pale yel- 

 low ; spire rather raised, conical ; sutures slightly impressed ; whorls 

 a little flattened; aperture rather large, whitish within; outer lip 

 acute; columella whitish, incurved, o])tusely angular at the base. 

 Habitat. — Alabama River; E. R. Showalter, M.D. 

 Diameter, '28 ; length, -62 of an inch. 



Observations. — Two specimens of this pale little species are before 

 me. They are nearly allied to punicea herein described, but it is a 

 Fjo. C)"" shorter and thinner species and of quite different color in the 

 epidermis. The aperture is more elongate and larger in pro- 

 portion. Both specimens are decollate, but in one there are 

 four whorls apparent, and I presume the normal number 

 would be six. The larger specimen has an obscure band on 

 the upper part of the whorl, which is well defined inside. The 

 smaller one has none whatever. There is a slight disposition to take 

 on folds on the upper whorls. The aperture is about one-half the 

 length of the shell. — Lea. 



233. G. gravida, Antho^ty. 



Melania gravida. Anthony, Proc. Acad. Nat. Sci., p. 59, Feb., 1860. Reeve, Monog. 

 Melania. Brot, List. 



Description. — Shell ovate, smooth, thick; spire obtusely elevated; 

 whorls 7-8, nearly flat; sutures well defined; lines of growth fine, 

 but very distinct; body-whorl large, subangulated ; aperture oval, 



