307 



Guppy Reprint 



59 



Page 75 



by a narrow curved mucro not so long as the body or main 

 portion of the shell. Lips everted, the inferior one border- 

 ed exteriorly by a raised ridge which towards the lateral 

 mucrones gradually becomes confluent with the edges of 

 the lips. Length 5 mm. of which the terminal mucro 

 forms about 2. Breadth nearly 3 mm. 



Related to H. inflexa and labiata of D'Orbigny — It differs 

 chiefly in being more inflated, especially the inferior valve, 

 and in being narrower behind the lateral mucrones, a 

 character it would seem of some importance in this genus. 



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 Hyalaea. The present 

 species belongs to Diacria on account of this character. 

 Scalaria leroyi Guppy, PI. I, f. 10.* 

 Proceedings of the Scientific Association of Trinidad 

 1867, p. 168. 



Turreted, cylindric, many-whorled, cancellated by nume- 

 rous transverse and spiral costellse, except on the base 

 which is spirally striate only. Aperture suboval. Pillar- 

 lip somewhat everted forming a callus on the columella. 

 Outer lip simple, sharp, a little dilated anteriorly. Whorls 

 regularly rounded, suture deeply sunk. 



My original description of this shell was drawn up from 

 an examination of the specimens found in Trinidad which 

 are so much altered by fossilization that the character of 

 the surface is not determinable. The examples from Ja- 

 maica are in good preservation, though they 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 



[^Geological Magazine, vol. 11, 1874, pi. 16.] 



