TROPIION, 139 



of species inhabiting the southern temperate and antarctic zones, 

 which, whilst possessing the main features of the type, the Uiminu' 

 and the white coh)r, present peculiar characters. These shells are 

 usually broadly ovate, shouldered, umbilicate, the aperture dark 

 colored within. They foini a transition to Siphonalia^nwd might 

 with almost equal projjriety be included in that genus. It may 

 be remarked here that Montfort's definition of the genus Trophon 

 does not correspond so well with the typical group as now recog- 

 nized, as it does with these Siphonalia-like shells. 



Kobelt has catalogued the genus in Jahrlmcher Deutsch. Mai. 

 Gesell., vi, 168, 1879. 



The name is a contraction of Troi)honius. a mythological 

 deity. 



1. Tyi)ival or lioreal Spevii's. 



T. CRATicuLATL's. Fab. PI. IH , Hgs. m\). aiO, .']0T, :5-20; PI. 33, 

 fig. 359. 

 Shell white, aperture white also. Length, l-^n-P;') inches. 

 Greenland; Iceland; Gulf of St. Lawrence; Spitzheryen ; 



Norway ; Pacific Coast of N. A'iii,erica south to PugeVs Sound. 



Fossil: England: Califoi'nia ; Japan (A. Ad.). 



The name given by Fabricius as of Linufeus was supposed by 

 Beck and others to be intended by Linnjeus for another species 

 of Trophon. and under this impression Beck changed the present 

 specific name to T. Fahricii. The species of LinniTeus is, how- 

 ever, a Fu^us ; so that it is i)i'o])er to continue to use the specific 

 name eraticida.tus, Fab. T. Oi'pheus, Gld. (fig. 310), is a shoul- 

 dered var. of this species, and T. .^qvainulifer, Carp. (fig. 320), 

 appears to be the same form. 1 figure a specimen from Puget's 

 Sound, which appears to unite the characters of 1\ Orpheua with 

 the thickened lip and throe revolving lines of T. i^quamiulifer. 

 T. temnsculptus, Carp. (fig. 3.59), from the post-pliocene of Sta. 

 Barbara, Cal., may also be the same species. 



Amongst the synonyms of T. craticulatu.^ I am much inclined 

 to place 



T. Heuglini. Morch ; which is thus described : 



Narrowl}^ fusiform, whitish; spire turreted with mamillar}' 

 apex ; the ribs are compressed, membranaceous, eight in number ; 



