396 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



from the posterior angle to the termination of the outer lip, mostly 

 so immediately anterior to the posterior angle. This waviness gives 

 the edge, when looked upon vertically, a crenated appearance which 

 evidently prompted Pfeiffer's name crenimargo. The basal, inner, 

 and parietal margin of the outer peristome is composed of a series 

 of slender fused laminae whose outer limits are indicated by a mere 

 line; the outer peristome of the inner lip is broader than the rest 

 and is reflected over the umbilicus which, when looked upon squarely, 

 it almost covers; the outer peristome of the parietal lip is appressed 

 to the preceding turn with which it is fused; the breathing pore is 

 on the parietal wall near the posterior angle of the aperture, and 

 here the parietal wall is partly slit; operculum paucispiral with the 

 nucleus a little more marginal than subcentral; the outside is covered 

 with a minutely granulose coat. 



All our specimens come from the type locality, Boca de Guarabo, 

 between Cienfuegos and Trinidad, Santa Clara Province. 



The specimen described and figured, U.S.N.M. no. 355039 has 3.5 

 whorls remaining and measures : Length, 13.7 mm ; greater diameter, 

 7.5 mm ; lesser diameter, 7.0 mm. 



CHONDROTHYRIUM VIOLACEUM (Pfeiffer) 



Shell rather variable in size and shape, the latter ranging from 

 elongate-conic to broadly ovate. The color ranges from flesh-color 

 through pale orange to purplish brown. The shell may be unicolor or 

 have interrupted bands of brown. The dots comprising these bands 

 are also arranged in axial series. Nuclear whorls 2.3, rather ele- 

 vated, well rounded, smooth, with the suture of the first turn chest- 

 nut-brown. The last part of the last whorl shows the beginning of 

 the postnuclear sculpture. Postnuclear whorls well rounded, almost 

 appressed at the sunmiit, marked by numerous slender, sublamellar, 

 somewhat retractively slanting, axial riblets and slender spiral threads 

 the junctions of which form slender tubercles. The spiral threads 

 also render the axial riblets somewhat wavy and give to them, when 

 examined in profile, a somewhat scalloped appearance. Suture con- 

 stricted. Periphery well rounded. Base moderately long, well 

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

 cords, the latter increasing in strength on the anterior half, but 

 weakening again within the umbilicus which is moderately large and 

 open. Aperture broadly oval, in some of the races almost subcircu- 

 lar; peristome double, white, the inner slightly thickened, expanded 

 and slightly reflected, and projecting above the outer peristome, which 

 is expanded to a varying degi^ee in the different races on the outer, 

 basal and parietal lip, and more broadly so on the columellar side; 

 the outer peristome is usually not flat but somewhat wavy. The 



