340 PROCEEDINGS OF THE XATIOXAL MUSEUM vol. 85 



The two specimens, U.S.N.M. no. 29054, were collected by C. 

 Wright. They have 3.8 and 3.6 whorls remaining and measure, re- 

 spectively: Length, 22.7 and 19.8 mm; greater diameter, 14.7 and 

 13.4 nnn ; lesser diameter, 12.2 and 11.6 mm. 



This species was described by Presasi from the Playa de Indios- 

 (Yiidios), Matanzas. It is narrowly confined to the region south 

 of tlie river at Matanzas, extending to the hilltop at Bellamar Cave. 



Of the animal of this Bartsch has made the following description : 



Animal short, forehead marked by numerous short streaks and 

 spots of brown, which give to it a somewhat marbled appearance. 

 Beliind this the body is flesh-color, with a buifish tinge. Tlie edge 

 of tlie forehead, ring about the eyes, and a narrow triangular area 

 beliind these are pinkish huffish. Snout gray, a little paler at the 

 edge of its fork. Tenacles pinkish at base, the rest coral red with a 

 brownish flush on the upper side. Sides of body smoky gray, a 

 lighter median streak between snout and cleft in sole on upper side. 

 Sole smoky gray, deeply medially cleft; motion alternate on the 

 two sides. Under side of body behind operculum flesh-color. 



The chubbiness and shortness of the shell distinguish this from 

 C. {C.) fictum.^ from which it is also differentiated b}^ its anatomic 

 characters. 



CHONDROPOMA (CHONDROPOMA) COGNATUM, new species 



Plate 30, Figuke 4 



Shell of medium size, elongate-conic, thin, semitranslucent, horn- 

 color, with interrupted s]>iral bauds of brown. The spots composing 

 these bands are arranged in both axial and spiral series. Nuclear 

 whorls almost 2, smooth except the last portion of the last turn, 

 which shows faint incremental lines. All the nuclear whorls are of 

 plain color. Postnuclear whorls narrowly tabulatedly shouldered at 

 the summit, marked by retractively slanting, threadlike axial riblets, 

 which are rather strong on the early whorls but become enfeebled on 

 the last turn. These threads are about one-third to one-fourth as 

 wide as the spaces that separate them. They become somewhat ex- 

 panded at the summit and render this rather conspicuously denticu- 

 lated. The spiral sculpture consists of slender, low, rounded threads, 

 which are of almost the same width and about one-half to one-third 

 as wide as the spaces that separate them. Suture slightly channeled. 

 Periphery of the last whorl well rounded. Base short, well rounded, 

 openly umbilicated, marked by the continuations of the axial riblets, 

 which here become emphasized as do the spiral threads which, while 

 a little narrower and somewhat wavy, are nevertlieless much stronger 

 than those of the spire. Both the axial and spiral sculpture extend 

 within the umbilicus. Aperture large, broadly oval; peristome 



