TROPHON. 139 



of species inhabiting the southern temperate and antarctic zones, 

 which, whilst possessing- the main features of the type, the laminae 

 and the white color, present peculiar characters. These shells are 

 usually broadly ovate, shouldered, umbilicate, the aperture dark 

 colored within. They form a transition to Siphonalia,ai}d. might 

 with almost equal propriety be included in that genus. ' It may 

 be remarked here that Montforfs definition of the genus Trophon 

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

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



Kobelt has catalogued the genus in Jahrbiicher Deutsch. Mai. 

 Gesell., vi, 168, 1879. 



The name is a contraction of Trophonius, a mythological 

 deity. 



1. Typical or Boreal Species. 



T. (JBATicuLATUS. Fab. ' PI. 31, figs. 301), 310, 307, 320; PI. 33, 

 fig. 359. 



Shell white, aperture white also. Length, 1 '25-1*5 inches. 

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



Norway; Pacific Coast of N. America south toPugefs Sound. 



Fossil: England; California, ; Japan (A. Ad.). 



The name given by Fabricius as of Linnaeus was supposed by 

 Beck and others to be intended by Linnaeus for another species 

 of Troplton. and under this impression Beck changed the present 

 specific name to T. Fabricn. The species of Linnaeus is, how- 

 ever, a Fumx : so that it is proper to continue to use the specific 

 name craticulatus, Fab. T. Orpheux, Gld. (fig. 310), is a shoul- 

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

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

 Sound, which appears to unite the characters of T. Orpheus with 

 the thickened lip and three revolving lines of T. squamulifer. 

 T. tenuisculptus, Carp. (fig. 359). from the post-pliocene of Sta. 

 Barbara, Cal., ma}' also be the same species. 



Amongst the synonyms of T. craticulatus 1 am much inclined 

 to place 



T. Heuglini, Morch ; which is thus described : 



Narrowly fusiform, whitish : spire turreted with mamillary 

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



