74 THE NAUTILUS. 



There are one nearly mature specimen and three immature 

 ones in the Adams' Collection received from Chitty and labeled 

 "obscurm?" from Kingston, Jamaica. My own set of four 

 specimens was received from Sowerby and Fulton as "obscurus" . 

 As these are apparently f ully developed and are quite congruous 

 in character, I have selected one of them as the type. The 

 largest specimen in the Adams Collection is narrower than the 

 type, the apex less eccentric and the posterior slope is longer 

 and nearly straight below the base of the apex. The radial 

 sculpture of the apex is very distinct in this specimen. When 

 additional material can be obtained, it may prove to be, at 

 least, varietally distinct. 



After carefully reviewing my material I am now inclined to 

 think that the Guadeloupe specimens considered as conspecific 

 in the first part of this paper (NAUT., XXXIII, p. 99), though 

 rather similar, are different. They will be considered else- 

 where. 



This species is also evidently related to A. beaui Bgt. from 

 Guadeloupe, but as compared with the figures of Bourguignat's 

 type, it is somewhat larger, proportionately not so wide, the 

 anterior slope is less convex, the posterior slope longer and it 

 lacks the distinct radial striation on the anterior slope, which, 

 though not mentioned by Bourguignat, shows very distinctly 

 in the photograph of his type. 



V. 



Ferrissia adamsi n. sp. PL III, figs. 7-9. 



Shell depressed, oval, very slightly wider anteriorly; lateral 

 margins equally curved; anterior slope nearly straight; posterior 

 slope straight below the base of the apex at which point it is 

 slightly incurved; left lateral slope very slightly convex; right 

 lateral slope a little concave; apex prominent, very obtuse, 

 slightl} 7 turned toward the right margin, situated nearly on the 

 median line and about one-third of the length from the poster- 

 ior end, radiately striate; surface smooth except for the distinct, 

 rather coarse, regular lines of growth; light horn color. 



Length 4, width 2.75, alt. 1.25 mm. 



Type locality Kingston, Jamaica. 



