240 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



cord marking the termination of the umbihcus. Aperture subcircular; 

 peristome double, the outer expanded a Httle less on the parietal wall 

 than on the rest, marked by a series of concentric lamellae; the inner 

 slightly exserted and reflected. Operculum paucispiral, with the 

 nucleus halfway between subcentral and submarginal; the whorls are 

 marked by feeble, retractively curved, slender lamellae, which do not 

 quite extend to the outer edge of the chondroid plate. 



The specimen described and figured, U.S.N.M. No. 57136, is one of 5 

 collected by Arango on EI Yunque. It has a little over 5 whorls 

 and measures: Length, 9.8 mm.; greater diameter, 4.9 mm.; lesser 

 diameter, 3.8 mm. 



Additional series of specimens before us come from Baracoa, El 

 Yunque, and Mata east of Baracoa. 



In this species the males are much smaller than the females. 

 Gundlach says of this species: "On stones and trees at Baracoa, Yun- 

 que and Mata. Animal brownish with dark dots which become con- 

 fluent into spots on the snout, the head and part of the neck. Eye 

 ring rose red-white. Tentacles bright coral red with gray apex. 

 The space between neck and foot is dark gray." 



Subfamily Adamsiellinae Henderson and Bartseh 



1920. Adamsiellinae Henderson and Bautsch, Proc. U. S. Nat. Mus., vol. 58, 

 p. 70. 



Shell ranging in form from ovate-conic to elongate-conic, marked 

 by axial and spiral sculpture of equal strength, this sculpture giving 

 the surface a granulose appearance, or marked by axial ribs which are 

 stronger than the spiral threads, the latter giving the ribs an articulate 

 appearance. In two groups the ribs are gathered into tufts at the 

 summit. No special breatliing device has been observed in any of the 

 species. The operculum consists of a chondroid basal plate composed 

 of several whorls, in which the upturned outer edge of the preceding 

 whorl is strengthened and built into a strongly elevated lamella by 

 the inner edge of the succeeding turn. There is no ribbing or buttress- 

 ing to this lamella. 



Type genus. — Adamsiella Pfeiffer. 



Genus ADAMSIELLA Pfeiflfer 



IS.'Jl. Adamsiella Ppeiffer, Zeitschr. Malac, vol. 8, p. 155. 

 CuBADAMSiELLA, new subgenus 



Shell ranging in shape from ovate to elongate-conic. Nuclear 

 whorls smooth, except for microscopic granulations; the last portion 

 of the last whorl usually showing the feeble beginning of the post- 

 nuclear axial ribs. The postnuclear axial sculpture consists of slender 

 sublamellar axial riblets. The spiral sculpture varies from obsolete 

 threads to nothing; when present it renders the axial ribs articulate. 



