382 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



marked by rather distantly spaced, moderately strong, retractively 

 slanting axial riblets, and much stronger distantly spaced spiral cords, 

 which on the last turn show intercalated cords of a finer strength than 

 the major cords. Periphery inflated, strongly rounded. Base inflated, 

 openly moderately broadly umbilicated, strongly rounded and 

 marked like the spire, with spiral cords of similar strength and a 

 continuation of the axial riblets. On the umbilical wall the axial 

 riblets become slenderer, more lamellose and more closely approxi- 

 mated, while the spiral sculpture becomes decidedly reduced. The 

 last whorl is solute for a slight fraction of a turn. Aperture broadly 

 oval; peristome double, the inner decidedly exserted and slightly 

 reflected ; the outer obliquely expanded, narrower on the parietal wall 

 than on the rest, marked by slender concentric laminae and form- 

 ing somewhat of an auricle at the posterior angle. Operculum thin, 

 paucispiral, with almost submarginal nucleus. 



The type, U.S.N.M. no. 390425, was collected by Bartsch at the 

 mouth of the Rio Ojo del Toro, Oriente, Cuba. It has 4 whorls re- 

 maining and measures : Length, 14.2 mm ; greater diameter, 11.0 mm ; 

 lesser diameter, 8.2 mm. 



The large series of specimens before us from this localit}^ and the 

 mouth of the Rio Puerco, a nearby stream, shows this to be a perfectly 

 distinct species, which in many ways recalls C . (C.) revocatwn, but its 

 larger size and much coarser sculpture apparently without inter- 

 grades entitle it to specific rank. 



Of the animal of this species Bartsch's field notes, taken at Rio 

 Puerco, August 30, 1930, state : "Forehead very pale pinkish brown, 

 tentacles smoke gray, moderately long slender ovally expanded at 

 the tip. Snout pale buff with a smoky tinge. Side of the body pale 

 smoky gray. Sole of the foot short, medially cleft, wave motion 

 of the two sides alternate. Progression is by short jerks, the shell 

 being carried obliquely." 



Found under stones, quite abundant. 



CHONDROPOMA (CHONDROPOMISCA) AGUAYOI, new species 

 PLATF. 35, FiGUBE 9 



Shell elongate-ovate, pale straw-color, with the first portion of the 

 remaining whorls chestnut-brown, which is also the color of the line 

 marking the plug in the truncated end. There are also present very 

 weak, rather distantly spaced, interrupted lines of brown. Nuclear 

 whorls decollated in all our specimens; postnuclear whorls moder- 

 ately rounded, narrowly shouldered at the summit and marked by 

 slender, retractively curved, somewhat sinuous, axial riblets and spiral 

 threads of the same strength, the combination of the two producing 



