330 LAND AND KRESH-WATEU SHELLS OF N. A. [PART IV. 



Observations. — The four bauds which are well marked on the three 

 specimens before, seem to be regular and prominent in character. 

 The two middle ones are slightly nearer together than they are to the 

 outside ones. These bauds are sti'ongly marked inside and out. The 

 transverse striiE are few, coarse and cord-like. Neither of the speci- 

 mens is perfect in the apex, and therefore the number of whorls 

 cannot be correctly ascertained. The bands are exhibited on all the 

 whorls. The aperture is nearly the length of the shell. This is a 

 remarkably beautiful species, the deep brown bands forming a con- 

 ti'ast to the bright yellowish horn-color of the ground. In outline 

 and general appearance it is closely allied to Shoicaltcrii herein de- 

 scribed, but it is more inflated and has a regularly formed spiral oper- 

 culum, while the Showalterii is long tongue-shaped. 



The young shell is generally smooth, polished and banded, 

 being very beautiful. This species is smaller than laeta and 

 differs in the aperture. 



242. G. calculoides, Lea. 



Melanin calculoides, Lea, Proc. Acad. Nat. Sci., p. 118, 1861. 



Goniohasis calculoides, LEA, Jour. Acad. Nut. Sci., v, pt. 3, p. 238, t. 34, f. 38, March, 

 18G3. Obs., i.\, p. 60. 



Description. — Shell striate, subglobose, thick, horn-color, robust; 



spire obtusely conical ; sutures impressed ; whorls six, very much 



inflated, the last large ; aperture rather large, elongately 

 Fig. 635. 



elliptical, whitish withhi; columella whitish, thickened, 



arcuate, rctuse at the base. 



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



Diameter, '50; length, -93 of an inch. 



Observations. — Four specimens of di3"ereut ages were 



received ; two are without bands and two have four bands 



It is not so globose as orbicula herein described, and is much 



It is also higher in the spire. It is nearest to Melania {Goni- 



obasis) robusta (nobis), but is not so high in the spire. The two dificr 



in the channel at base of the columella. The aperture is a little more 



than half the length of the shell. All these specimens are more or 



less striate, the upper ones being more conspicuous. — Lea. 



Very closely allied to G^. odta. 



