GUPPY- — J A1E AICATf TERTIARY FOSSILS. 
by a narrow curved rnucro 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. 
Belated to II. inflexa and labiata of D’Orbigny — It differs 
eliieffy 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 Uyalaca , The present 
species belongs to Diacria on account of this character, 
Scalaria leroyi Guppy— Plate 1, f. 10 
Proceedings of the Scientific Association of Trinidad 
1867, p. 168. 
Turreted, cylindric, many-whorled, cancellated by nume- 
rous transverse and spiral costellae, except on the base 
which is spirally striate onfy. 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 tho surface which 
might induce a belief that there are two species. I do 
