352 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



are marked by rather prominent spiral cords, wliicli increase in ni-m- 

 ber by intercalation as the shell increases in size. On the early 

 whorls there are also rather conspicuous, quite rej^ular and regularly 

 disposed, slightly retractiveiy slanting, axial threads. These become 

 enfeebled and in some of the races practically obsolete on the hist 

 turn. The summit of the whorls is rendered feebly denticulated by 

 the axial nuirkings. Suture well constricted; periphery inflated, 

 strongly rounded. Base inflated, strongly rounded, openly umbili- 

 cated and marked with the same sculpture that chai-acterizes the 

 spire. This, however, becomes enfeebled on the umbilical wall. 

 Aperture broadly ovate. Peristome simple, except at the slight 

 auricle at the posterior angle where there is an indication of doubl- 

 ing. Operculum paucispiral witli the nucleus halfway between mar- 

 ginal and central, covered with a tliin deposit of calcareous granules. 



Of the animal of C . (C.) moe.sfvm nioralesi, Bartsch took the fol- 

 lowing color notes from specimens collected at the type locality of 

 that race, July 15, 1928 : 



Animal flesh-color, with a pinkish tinge; forehead with numerous 

 grayish sjiots, which are larger than usual; snout darker than fore- 

 head except at edge, which is devoid of spots. Tentacles with orange 

 flesh-colored basal ring and brown tip. Sides of body ashy ; foot ashy 

 flesh-color, with brownish tinge medially deeply cleft. Motion of 

 two sides alternate. 



This species occupies the coastal region and adjacent hills innnedi- 

 ately west of Matanzas Bay. 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMA) MOESTUM 



Shell with interrupted spiral bands of brown. 



Length of decollated shell more than 16 mm decurrens 



Length of decollated shell less than 13 mm moralesi 



Shell without interrupted spiral bands of brown moestum 



CHONDROPOMA (CHONDROPOMA) MOESTUM DECURRENS (Poey) 

 Plate 31, Figtjke 11 



1858. Cyclostonm dcnirrcns Poey, Memorias sobre historia natural de la Isla de 

 Cuba, vol. 2, p. 23. 



Poey, in his usual lucid way, gives a splendid characterization of 

 this race, which has been confused Avith typical C. {C.) moestuin 

 moestum owing in large part, we believe, to mixed collectings. The 

 sliells that occupy the region about Punta Sabanilla are typical C. 

 (C.) m. moestum^ while the present race occupies the region about 

 the Sinclair Oil Co.'s tanks at Dubroc. innnediately south of Punta 

 Sabanilla. The shells of this race are thinner, with more numerous, 

 less strong, spiral cords and stronger axial elements amounting almost 



