138 TRornoN. 



T. EXPANsrs, Sowb. PI. 30, tig. SW. 



The broad frill of tiie marginal vai-ix is Ur- j)riiici{)al feature. 



Length, '85 inch. 



Ildb. unknown. 

 T. CANCELLATUS, Sowb. PI. 30, tig. 303. 



Shell obscurely cancellated, white ; a arices broadly foliated, 



hooked at the shoulder, the folia? extending to the lower end of 



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



varices. Length. 5 inch. 



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



T. (jRANDis, A. Adams. PI. 30, tig. 30(ia. 



Varices broad, timlwiate-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, tigs. 304. 305. 



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

 as the preceding. Von Martens acknowledges the identity of 

 his T. Jamrachi with fimhriatus, A. Adams (tig. 306), Avhich is 

 evidently the adult state of T. jdntiatux. 



T. coRONATUs. Brod. 



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

 Curaingian Collection. 



Bay of Caraccds, Venezuela. 



T. TRIANGULARIS, A. Ad. 



Tusiform, triangular, white, subcancellate; three pinnate varices, 

 tubulate behind ; interstices transversely Urate, with a median 

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



Hab. ? (Mus. Cuming.) 



Said to resemble 3Iure.r Iripferiis in form. Not tigured. 



(icnus TROPHON, iMontf. 



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

 whorls with numerous, sharp, laminated varices, the interstices 

 smooth, or spirally riblied ; canal open, usuall}' turned to the 

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

 tially boreal in distribution. There is, howt'ver, another group 



