ART. 6 A NEW WEST INDIAN MOLLUSK FAUNULA BAHTSCH C> 



plane, but somewhat sinuous, being decidedly bent in at the um- 

 bilicus. The parietal wall appears notched on account of the absence 

 of the expanded peristome. 



Stibgenotype. — Ghondropoma {GhondropoTyiella) Tnagnifica (Salle) 

 Pfeiffer. 



CHONDROPOMA (CHONDROPOMELLA) BEATENSIS Clench 



Plate 1, Figxjres 7, 9 



1932. Chondropoma {Chondropomium) heatensis, Clench, Proc. New England 



Zool. Club, vol. 12. p. 100. 

 1932. Chondropoma {Chmidropomium) beatensis armotiri Clench, ibid. 



Shell elongate-conic when complete, flesh-colored with interrupted 

 spiral zones of brown. Some of these zones are fulgurated, others 

 merely elongated dots, and still others of these dots are joined into 

 bands, while the one below the periphery is most conspicuous and 

 broader than the rest. The base is also marked by interrupted bands, 

 though less conspicuously so than the spire. The inner peristome 

 is white, while the outer is slightly raj^ed. Nuclear whorls 2, straw- 

 colored, strongly rounded. Postnuclear whorls well rounded, 

 marked by slender, slightly retractively slanting axial riblets, which 

 are about as wide as the spaces that separate them, and which render 

 the summit of the whorls feebly crenulated. Suture moderately 

 constricted; periphery somewhat inflated, strongly rounded. Base 

 narrowly umbilicated, somewhat inflated, strongly rounded, and 

 marked by the continuation of the axial riblets. The columellar 

 wall of the umbilicus is marked by few obsolete spiral threads near 

 its outer margin. The last whorl is slightly solute. Aperture ovate ; 

 peristome double, the inner projecting slightly above the outer and 

 slightly expanded; the outer broadly expanded, more so on the 

 outer and basal lips than on the columellar border, where it is only 

 about one-third as broad as on the rest. Operculum thin, corneous, 

 typically chondropomoid. 



Remarks. — The specimen described and figured, U.S.N.M. No. 

 403919, has 3.5 whorls, and measures: Height, 14 mm; diameter, 

 9.4 mm. Some specimens are considerably larger than this, one 

 with 4 whorls measuring: Height, 18 mm; diameter, 11.2 mm. 

 About 60 additional specimens, mostly dead, were obtained. 



LUCmELLA BEATENSIS. new species 



Plate 2, Figtjbes 4, 5, 6 



Shell minute, almost lenticular, pale straw-colored. Nuclear 

 whorls 1.3, well rounded, smooth, excepting microscopic granules. 



