186 CHLOROSTOMA. 



carina there. The periphery is sometimes rounded but usually 

 carinated ; the base is convex, broadly concave around the umbilicus. 

 Aperture oblique ; columella sinuous ; more deeply receding above 

 than in any other species, and angulated at its junction with the 

 white callus upon the whorl, strongly unidentate below ; umbilicus 

 broad, deep, with two spiral ribs within; one terminating in the 

 callus of the columella at its junction with the body-whorl, the other 

 ending in the basal tooth of the columella. 

 Alt. 14-17, diam. 18-22 mill. 



West Indies generally ; Florida Keys (Simpson). 



T. scalaris ANTON, in PHILIPPI, Abbild., i, Trochus, t. 4, f. 11 

 (1844). PHILIPPI, Conchyl. Cab., p. 182, t. 28, f. 11. FISCHER, 

 Coq. Viv., p. 255, t. 85, f. 3. T. canaliculatus D'ORB., Moll, de Cuba, 

 t. 18, f. 18, 19. PHILIPPI, Conchyl. Cab., p. 227, t. 34, f. 14. Mono- 

 donta liv) do-ma culata C. B. ADAMS, Proc. Bost. Soc. N. H., ii, 1845, p. 7 

 (teste Fischer). T. gundlachi PHILIPPI, Zeitschr. f. Mai., 1848, p. 

 108, and Conchyl. Cab., p. 226, t. 34, f. 13. 



I do not quote Globulus indusii CHEMNITZ, Conchylien Cabinet, 

 v, p. 116, f. 1682, because the figure is unidentifiable and because 

 Chemnitz says of his shell, Er ivird wiederum von diehte aneinander 

 sitzenden Perlenreihen umgeben; and the granulation of the lira? of 

 this species is never obvious enough to justify such a term as 

 " Perlenreihen." 



In general, this form may be recognized by the broad umbilicus, 

 strongly 2-ribbed within, the low, irregular, cord-like line, the 

 acutely pointed spire, and especially by the very deep angular 

 sinuosity of the columella. There are sometimes two spiral ribs 

 instead of one at the margin of the umbilicus. PI. 24, figs. 86, 87 

 are T. gundlachi Phil., a form which seems to be synonymous, cor- 

 responding with immature specimens of the C. scalare. 



C. FASCIATUS Born. PI. 29, figs. 74-77. 



Shell umbilicate, depressed, thick and solid ; smooth; ground-color 

 yellowish, elegantly painted with red, black or brown in innumer- 

 able patterns, usually some combination of spiral rows of dots or 

 blotches, and radiating irregular flames ; whorls about 6, the apex 

 acute, upper whorls nearly flat, the last flattened beneath the suture, 

 convex, rounded, descending; base rounded, concave around the 

 umbilicus ; aperture oblique, outer lip finely crenulated within ; 



