HISPANIOLAN AND BAHAMAN ANNULARUDAE 11 



slight rectangular pits, having their long axis parallel with the axial 

 sculpture. Suture moderately constricted. Periphery of the last whorl 

 rounded. The base is moderately long, very openly umbilicated, strongly 

 rounded, and marked by the continuation of the axial riblets and spiral 

 threads equal to those on the spire except the four within the umbilicus, 

 which are stronger. The last whorl is solute for about one-sixth of a 

 turn. Aperture oval, posterior angle acute; peristome simple, slightly 

 expanded and reflected, more so on the basal part of the outer and 

 basal lip than on the rest. Operculum thin, corneous with subcentral 

 nucleus, covered with a fine, thin granular deposit. 



Pfeiffer's type was collected by Salle at Yaque, Dominican Republic. 

 The specimen that we have described and figured is one of 4 (U.S.N.M. 

 No. 529443) without specific locality. It was obtained from Sowerby 

 and Fulton. It has 4.5 whorls remaining and measures : Length, 14 mm. ; 

 greater diameter, 8.2 mm.; lesser diameter, 6 mm. 



CHONDBOPOMA (CHONDROPOMOBrS) SIMPLEX (Pfeiffer) 



Plate 1, Figure 2 

 1854. Cyclostoma (Chondropoma) simplex Pfeiffer, Proc. Zool. Soc. London, 



1852, p. 143. 

 1854. Cyclostoma simplex Pfeiffer, Martini-Chemnitz Conchylien Cabinet, ed. 



2, vol. 1, sect. 19, pp. 368-369, pi. 47, figs. 23, 24. 

 1920. Chondropoma (Chondropoma) simplex Henderson and Bartsch, Proc. 



U. S. Nat. Mus., vol. 58, p. 62. 

 Shell small, elongate-conic, flesh-colored, with inconspicuous inter- 

 rupted spiral bands of brown. The spots forming these bands have both 

 an axial and a spiral arrangement. There is also a dark oblique streak 

 on the first of the remaining turns marking the internal plug at the 

 decollated end. The interior of the aperture is the same color as the 

 outside, probably a little paler. Peristome a trifle paler. The nuclear 

 whorls are decollated in all our specimens. The postnuclear whorls are 

 inflated, strongly rounded, narrowly shouldered at the summit, marked 

 by very regular, slender, retractively slanting, axial threads, which are 

 given a scalloped effect in passing over the rather broad low rounded 

 spiral threads. The axial ribs are at irregular intervals gathered into 

 weak tufts at the summit. This character is best expressed on the early 

 turns, becoming enfeebled on the last. The junctions of the axial ribs 

 and spiral threads form slender tubercles whose long axis coincides 

 with that of the axial ribs. The suture is strongly constricted. Periphery 

 of the last whorl inflated, well rounded. The base is moderately long, 

 somewhat inflated, strongly rounded, narrowly umbilicated and marked 

 by the continuations of the axial ribs and spiral cords, the latter grow- 

 ing successively a little weaker from the periphery toward the umbilicus. 

 The umbilicus shows several spiral threads within. The last whorl is 

 solute for about one-tenth of a turn. Aperture oblique, broadly oval. The 

 peristome is double; the outer slightly expanded and slightly reflected. 



