188 TRIFORIS. 



T. NIGROCINCTUS, C. B. Ad. PL 39, fig. 52. 



Dark chocolate color; whorls about 13-15, with three series of 

 subequal granules, suture excavated, bearing a thread, body whorl 

 with four series of tubercles, and two or three basal ridges below 

 them. Length, 10 mill: 



New England to West Indies. 



Generally considered by European conchologists a variety of T. 

 perversus, Linn., and perhaps should be relegated to that species. 

 Dark specimens are unicolored, but lighter ones show the sutural 

 thread darker whence the name. T. modestum, Ads., appears to 

 be the same, and Morch refers here Cerithium pusillwn, Pfr. 



T. TURRIS-THOM.E, Chemn. PI. 39, fig. 53. 



Whorls 11, each with a spiral series of large white tubercles, and 

 a much smaller chestnut colored series, forming a band. 



Length, 5' mill. 



West Indies. 



T. mirabilis, Ads., is a synonym. 



T. INTERMEDIUS, C. B. Adams. PL 39, fig. 54. 



Whorls about 12, at first with two, afterwards with three spiral 

 series of tubercles, and three additional less nodulous ridges at the 

 base of the body whorl ; reddish brown, with a white spiral band on 

 the lower part of the whorls. Length, 6-8 mill. 



West Indies. 

 This is T. turris-Thomce, d'Orb., not Chem. 



T. ORNATUS, Desh. PL 39, fig. 46. 



Triseriately tuberculate, dark brown, with here and there a white 

 tubercle, and the lower series white banded. Length, 7-1,0 mill. 



West Indies. 



This and the two preceding species, though nearly related, appear 

 to be distinct ; the present is the most robust of the three. 



Section SYCHAR, Hinds, 1844. 



T. VITREA, Hinds. PL 39, fig. 55. 



Pellucid, yellowish white; whorls 15, smooth, rounded, with a 

 strong median raised line and a smaller one below it. 



Length, 10 mill. 



Straits of Malacca. 



