406 R. J. L. Guppy — West Indian Tertiary Fossils. 



The length of the terminal portion of the shell seems to be relied 

 upon as the distinction between Diacria and the more typical members 

 of the genus Hyalcea. The present species belongs to Diacria on 

 account of this character. 



Scalaria Leroyi, Guppy, PL XVI. Fig. 10, and PI. XYIII. Fig. 2. 



Proceedings of the Scientific Association of Trinidad, 1867, p. 168. 



Turreted, cylindric, many-whorled, cancellated by numerous trans- 

 verse and spiral costellee, except on the base, which is spirally striate 

 only. Aperture suboval. Pillar-lip somewhat everted, forming a 

 callus on the columella. Outer lip simple, sharji, a little dilated 

 anteriorly. Whorls regularly rounded, suture deeply sunk. 



My original description of this shell was drawn up from an exami- 

 nation of the specimens found in Trinidad, w'hidh are so much altered 

 by fossilization that the character of the surface is not determinable. 

 The examples from Jamaica are in good preservation, though tbey 

 are not so large as those found in Trinidad, one of which is more 

 than six inches long. Some of the specimens from Jamaica exhibit 

 a variation in the character of the surface, which might induce a 

 belief that there are two species. I do not, however, take that view. 

 One beautiful example has the transverse costellas larger and more 

 distant than the spiral ones, the latter being threadlike and rising 

 upon the former. In this example the spiral striation of the base is 

 also more marked. Sc. Leroyi may be compared with Sc. magnifica, 

 Sow. ; but there are points of resemblance between it and Sc. 

 decussata, raricosta, and lineata. None of the recent West Indian 

 species bear any resemblance to the fossil except in that general 

 shape which is common to nearly all the members of the genus. On 

 the whole, however, the nearest ally of the Jamaican fossil may 

 perhaps be found in Sc. tenuistriata, Orb. (Bahia Blanca). 



Bingicula tridentata, n. sp. 



Ovate-conic, moderately thick, smooth, shining. Spire conic. 

 Whorls about 4. Aperture suboval : columella thickened and bear- 

 ing two strong spiral plaits, the callus continued backward, and 

 carrying a stout tooth on the body-whorl ; the latter separated by a 

 deep notch or canal from the thickened and somewhat everted outer 

 lip. Length nearly 2 mm., breadth about 1. 



Distinguished from E. semistriata. Orb. (Cuba Shells, vol. ii. p. 

 103, pi. xxi. f. 17-18), by a wider mouth and less thickened outer 

 lip. B. irideida-ta does not exhibit any trace of the striation which 

 marks the anterior portion of B. sennistriata, which was described by 

 D'Orbigny as a recent shell from Jamaica. 



Naticina regia, n. sp. PI. XVII. Fig. €. 

 Oval oblong, spirally striated by fine equidistant grooves, which 

 are crossed by a few rather irregular lines of growth. Whorls 

 about 5, the last verj' large. Spire short, acuminate. Aperture 

 semioval, rather narrowed above. Umbilicus round, very partially 

 h.idden by the everted columella callus. Outer lip sharp, indis- 

 tinctly dentate. Length 15 mm., breadth nearly 10. 



