500 Guppy — West Indian Geology. 



Descriptions of a New Genus and Six New Species of Mollusca, from 

 the Caribean Miocene. 



I. — Crepitacella. — gen. nov. 



Shell turreted, cono-cylindric, last whorl large, rounded ; aperture large, with a 

 broad and short anterior canal. Columella twisted ; peristome simple, prominent. 



C. cepula, Guppy, Quart. Journ. Geol. Soc, Vol. xxii. p. 580, pi. xxvi. fig. 14. 

 Upper Miocene, Cumana. 



The true position of this shell is probably in the neighbourhood of the family 

 Buccinidce, in which I have provisionaUy placed it. Its nearest relation known to me 

 is Gyllene pulchella, Adams. 



6 

 Names of New Species Figured and Described. 



Fig. 1. Leda incognita. 

 „ 2. Xeda bisulcata, 

 „ 3. Tornatina coix-lacryma. 



Fig. 4. Stomatia eidolon. 

 ,, 5. Nucula Schomburghi 

 „ 6. Mactra subovalina. 



II. — Stomatia eidolon. (Fig. 4.) 



Shell depressed, ear-shaped, few-whorled, radiately striate, with a furrow near the 

 outer angle of the whorls ; spire small, depressed. 



This little shell resembles a Haliofis without holes, and for this reason I have 

 placed it in the genus Stomatia ; for in some respects it resembles a Sigaretus, differ- 

 ing from the latter genus in having a groove along the margin of the whorls, as in 

 Haliotis. 



Lower Miocene, San Fernando, Trinidad. 



III. — Tornatina coix-lacryma. (Fig. 3.) 

 Shell small, cylindrical-oval, nearly smooth, but with fine spiral stria?. Spire sunk, 

 the first whorl projecting as a small papillary knob ; whorls slightly concave below 

 the_ superior angle ; suture channelled. Aperture long and narrow, widening an- 

 teriorly ; columella with a callous plication. 



This shell recalls the secondary Acteonince. It is apparently related to T. coarctata 

 and T. canaliculata, D'Orb., and, perhaps, also to Bulla Zajonkaireana, Basterot, of 

 the European Miocene. Only the point of the spire is above the plane of the last 

 ■Vfhorl. 



From the Upper Miocene of Cumana and Jamaica. 



IV. — Nucxda Schomburghi. Forbes. (Fig. 5.) 



(Forbes in Schomburgk's History of Barbados, p. 565.) 



This shell varies a good deal in height and width. The lunule is impressed, but 

 not circumscribed, nor is there a circumscribed dorsal area. The shell is thick and 

 nacreous ; the teeth of the hinge are pointed. 



Lower Miocene, San Fernando, Trinidad. 



V. — Leda bisulcata. (Fig. 2.) 

 Shell ovately trigonal, with numerous concentric ribs, narrower than their inter- 

 stices ; with a somewhat sinuous elevated ridge running from the umbo to the pointed 

 rostrum behind; rounded anteriorly with a round groove running from the umbo to 

 the ventral margin near the anterior angle. Umbones close ; posterior dorsal are a 



