i54 Bulletin 29 318 



mentation is formed of squamose plates, crenate or vaulted. 

 Whorls about six, convex anteriorly, flattened posteriorly, the 

 angle on the shoulder being marked by a conspicuous row of 

 vaulted squames of which there are eighteen on the last whorl. 

 Above and below this the whorls are sculptured with crenate 

 spirals, usually alternating in strength and tending to become 

 nodular on the base. Length of largest specimen 30, width 

 23 mm. 



Localities. — (Exp'd '16) Zone B, Rio Gurabo; Zone H, Rio 

 Cana. 



Turbo dominicensis variety Laloi, n. var. 

 Plate 24, Figure 15 



Shell imperforate with six angulated whorls; on the last are 

 fifteen larger and six smaller revolving, rounded ribs, 21 in all. 

 The most conspicuous is the beaded rib beneath the suture, an- 

 terior to it on the last whorl are three other smaller, beaded 

 spirals and among them two very fine beaded threads, all being 

 on the flattened posterior part of the whorl, the ribs elsewhere 

 are not beaded. Length 23, width 18 mm. This shell differs 

 from Gabb's description of his unfigured T. dominice?isis in the 

 angulated whorls and limited number of beaded spirals. 



Localities. — (Exp'd' 16) Bluff 2, Cercado de Mao; Zone G, 

 Rio Gurabo at Los Quemados; Zone I, Rio Cana at Caimito. 



Genus Astralium Link 



Astralium sublongispinum, n. sp. 

 Plate 24, Figures 16, 17 



Astralium longispinum Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 242, 

 1873. Not Trochus longispina L,amarck. 



Shell resembling recent A. longispinum but with much finer, 

 more even and oblique sculpture above, and more numerous, 

 finer spirals beneath, the early whorls are not flattened as in the 

 recent shell. The recent species is doubtless the descendant and 



