138 TROPHON. 



T. EXPANSIS, Sowb. PI. 30, fig. 306. 



The broad frill of the marginal varix is the principal feature. 



Length, -85 inch. 



Hab. unknown. 

 T. CANCELLATUS, Sowb. PL 30, fig. 30o. 



Shell obscurely cancellated, white ; varices broadly foliated, 

 hooked at the shoulder, the folise extending to the lower end of 

 the short canal ; tubes usually connate with the hooks of the 



varices. Length, ^5 inch. 



Bahamas, St. Johns, W. I. (Krebs.) 



T. GRANDIS, A. Adams. PI. 30, fig. 30tta. 



Varices broad, fimbriate-lamellar. Length, 1'5 inches. 



Gulf of California. 



The largest species of the genus, and the type of a group of 

 species peculiar to the West Coast of America. 



T. PINNATUS, Brod. PI. 30, figs. 304. 305. 



Also from (jiilf of California. I suspect it is the same species 

 as the preceding. Von Martens acknowledges the identity of 

 his T. Jamrachi with fimbriatus, A. Adams (fig. 305), which is 

 evidently the adult state of T. pinnatus. 



T. CORONATUS. Brod. 



The only specimen known, Avhich is not adult, is in the 

 Cumingian Collection. 



Buy of Car(icc<(ft, Venezuela. 

 T. TRIANGULARIS, A. Ad. 



Fusiform, triangular, white, subcancellate; three pinnate varices. 

 tubulate behind ; interstices transversely lirate. with a median 

 node ; aperture oval, canal moderate, open, turned to the right. 



Hab. ? (Mus. Cuining.) 



Said to resemble Murej- tripterus in form. Xot figured. 



Genus TROPHON, Montf. 



The typical Trophon has a fusiform shell, thin and white, the 

 whorls with numerous, sharp, laminated varices, the interstices 

 smooth, or spirally ribbed; canal open, usually turned to the 

 left ; no umbilicus ; lip thin, smooth within. This group is essen- 

 tially boreal in distribution. There is, however, another group 



