146 TROPHON. 



T. PLUMBETJS, Old. PI. 31, figs. 334, 324, 327 ; PI. 70, fig. 432, 



This is figured in the Wilkes Exped. Mollusca as Fusus plum- 

 beus, Phil. The latter, however, is a Euthria, from the North- 

 west Coast of North America, whilst the mollusk figured by 

 Gould is a Trophon, and probably from Orange Harbor (Terra 

 del Fuego). The animal is yellow like others of the genus, and 

 the operculum has its nucleus terminal. " The animal secretes 

 abundantly a sap-green viscous fluid." Couthouy. Fusvs roseus, 

 Hombr. (fig. 327), appears to be the same species. 



T. BUCCINEUS, Gray. PL 39, fig. 490. 



No description or locality is given but an excellent figure, 

 which I copy. The shell is allied to T. plumbeus, is light 

 chocolate-brown, deeper within the aperture, and a little exceeds 

 an inch in length. 



T. XANTHOSTOMA, Brod. PL 33, figs. 349, 350. 



Perfect specimens have the varices beautifully firnbriated by 

 the crossing of six or eight prominent revolving ribs, whilst the 

 interstices of the latter are crowded with incised revolving lines, 

 and crossed with raised growth-striae The adult is very rarely 

 in this perfect condition. It much resembles forms of T. Gever- 

 sianus, but may be distinguished b} T the following characters : 

 the shell is much heavier, the lamella* are broader, the shoulder 

 of the whorl is more sloping, the aperture is inclined to pink 

 within, and the lip is frequently margined inside and slightly 

 dentate. Like T. Geversiamis, this species varies much in the 

 proportions of the shell. It has characters in common with 

 Siphonalia. Reeve (who figures it as a Purpura) remarks upon 

 its variability and the difficulty of assigning it permanently to 

 any genus. I figure Fusus fusiformis, Potiez et Midland (PL 

 70, fig. 432), which is certainly the same species. 

 Dredged in gravel and sand, 7 to 25 fathoms ; 



harbor of Valparaiso, Chili. 



T. HORRIDUS, Brod. and Sowb. PL 33, figs. 356. 353. 



Only differs from T. xanthostoma by its elongated spire, and is 

 probably a variety of that species. The type is young, and does 



