404 CALLIOSTOMA-EUTROCHUS. 



inent below the sutures, and slightly scalate ; encircled by 9-1 (> 

 sul)graniferous unequal ribs ; base little convex, spirally costate, 

 the costie subplane ; umbilicus profound, funnel-shaped, encircled 

 by two prominent crenulated ribs ; aperture subquadrate. 

 Alt. 20, (Ham. 21 mill. (Dkr.) 



Has the habitus of Z. conulus L., and the sculpture of Z. 

 armil/atus Wood. 



Bass's Strait, Australia. 



(American species.) 



C. JUJUBINUM Gmelin. PL 40, fig. 16. 



Shell pyramidal-conic, solid, heavy, with a narrowly perforate 

 funnel-shaped undjilicus. Color chestnut-brown, purple-brown on 

 the upper whorls, marked with narrow, curved, rather widely separated 

 longitudinal white streaks, the base minutely dotted with white. 

 The sculpture consists of numerous little-elevated sjiiral beaded 

 lirulfe, with many spiral strire between them ; the base is flat and 

 has coarser concentric subgranulose lirje, becoming finer toward the 

 outer margin. Spire elevated, the whorls about 10 in number, con- 

 cave above, swollen and projecting at the periphery, the last obtusely 

 angled. Aperture quadrate, oblique ; outer lip beveled, strongly 

 5 or 6 lirate within ; basal lip straight, very thick, obtuse, crenulate, 

 lirate inside ; columella arcuate, ending below in a point or tooth. 

 Umbilicus white within. Alt. 33, diam. 26 mill. 



Coast of N. Carolina to Fla., Texas, Yucatan; Entire West Indies. 



Trochus jujubinus Gmel. Syst. Nat. xiii, p. 3570. — Philippi, 

 Conchyl. Cab., p. 37, t. 7, f 8, 9, t. 13, f. 5. — Fischer, Coq. Viv., p. 

 80, t. 18, f. 2. — Zizyphinus jujubinus Gm., Reeve, Conch. Icon., f. 

 12. — CalUostoma (Eutrochus) jujubinum Dall, 'Blake' Gasterop., 

 Bull. M. C. Z. xviii, p. 369. 



The figure of this species is not very characteristic, being smaller 

 than average shells, and the whorls are not prominent enough above 

 the sutures. The older authors, including Reeve, supposed the species 

 to come from the Indian Ocean and Australian Seas, but Philippi 

 and Fischer know it to be a West Indian shell. Many American 

 collectors have long known the species to be Antillean. The young 

 have a minute smooth, rounded, rather elevated dextral nucleus, and 

 bicingulate periphery. 



