172 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



arranged in both axial and spiral series. These markings are present on 

 both spire and base. Nuclear whorls 1.7, inflated, strongly rounded, 

 forming a rather conspicuous apex. Postnuclear whorls decidedly in- 

 flated and strongly rounded; the early ones marked by rather strong 

 axial ribs which become weaker on the later turns and obsolete on the 

 last whorl. On the early turns the axial ribs are a little broader than 

 the spaces that separate them. Suture strongly constricted. Periphery 

 inflated, strongly rounded. Base short, very strongly rounded, very 

 openly umbilicated and marked by a single spiral thread on the um- 

 bilical wall a little within the edge of the umbilicus. Last whorl solute 

 for about one-fifth of a turn. Aperture broadly ovate; peristome simple, 

 slightly expanded and slightly reflected. Operculum? 



The type (U.S.N.M. No. 504141) was collected by W. J. Eyerdam at 

 Trou Louise, Gonave Island. It has 4.5 whorls remaining and measures : 

 Height, 18.0 mm. ; greater diameter, 14.7 mm. ; lesser diameter, 12.0 mm. 



U.S.N.M. No. 380245 contains 15 topotypes. 



U.S.N.M. No. 380218 contains i specimen collected by Eyerdam near 

 South Abricots, Gonave Island. 



U.S.N.M. No. 504142 contains i specimen from the Chamberlain Col- 

 lection marked "Gonave Island." 



U.S.N.M. No. 499359 contains i specimen collected by Catherine Par- 

 rish at Point Fantasque, Gonave Island. 



U.S.N.M. No. 504143 contains 6 specimens collected at Petit Gonave 

 Island. 



Most of the specimens are crab-carried shells. It seems remarkable 

 that such a fine species should have failed to yield living specimens. 



INCERTirOMA FEBOX, new species 



Plate 29, Figure 4 



Shell broadly elongate-conic, bluish white, with very small dots of 

 pale brown, which are arranged in both axial and spiral series. Spirally 

 they are rather distantly spaced; six of these are present between the 

 summit and the periphery of the last whorl and four are on the base; 

 those on the base are a little larger than the rest. Nuclear whorls de- 

 collated in all our specimens. Postnuclear whorls well rounded and 

 marked by low, rounded, rather coarse, closely spaced axial ribs, which 

 are gathered into heavy toothlike tufts at the summit. Of these ribs, 79 

 are present on the last whorl. The spiral sculpture consists of cords a 

 little less strong than the axial ribs. Of these, 16 are present between 

 the summit and the periphery on the last turn. Suture quite strongly 

 constricted. Base rather long, openly umbilicated, well rounded, and 

 marked by the continuation of the axial ribs and 10 spiral cords. The 

 axial ribs also extend upon the umbilical wall, which also bears one 

 strong and several finer spiral threads. Aperture ovate ; peristome simple, 

 slightly produced at the junction of the outer and basal lip, forming a 



