TROPHON. 141 



uniformly to the description of T. truncatus, but specimens from 

 Arctic American localities vary all the way in size from the T. 

 clathratus or large form (equivalent to T. lyratus, Lam., fig. 312, 

 and T. scalarifyrmis, Gld., fig. 314), to the small shells corres- 

 ponding to T. truncatus; and the ribs vary greatly in number, 

 not only on different specimens, but even on different whorls of 

 the same species. Murex Bamffivs of Montagu is a synonym of 

 the English type. A scalariform variety, with excavated sutures, 

 shouldered whorls, coronated with spines more or less, has been 

 called T. Gunneri by Loven, and T. multicostatus (fig. 316), 

 by Escholtz. Provisionally, I allow the T. truncatus to stand 

 as a variety. 



Inhabits from Spitsbergen ; Norway ; Or eat Britain ; Iceland ; Arctic 



America, south to Massachusetts ; Newfoundland ; W. Coast of 



America, to Vancouver 's Island ; Japan. Depth, 5-500 fms. 



It is a usual post-glacial fossil of N. Europe, and the variety 

 occurs in the older pliocene at Messina.' Post-pliocene, Santa 

 Barbara, Cal. The Icelanders call it " St. Peders-snekke," or 

 St. Peter's snail ; I know not why. 



Dr. Jeffreys sep.Mntted the large and small forms in his British 

 Conchology, but has more recently thought fit to unite them. 



.Fusus candelabrum, Ad. and Reeve (fig. 317), is indistinguish- 

 able from the shouldered carinate form of Gould's Fusus scalari- 

 formis. It is reported from Japan, by A. Adams. 



T. MURICIFORMIS, Dall. PI. 31, fig. 313. 

 Yery like Busycon carica in form. 

 Length (apex broken off), 40 mill. 



Behring's Sts., Dall ; Victoria, Vancouver^ I. (young), Richardson. 



Large and peculiar as is this shell, I very much doubt its dis- 

 tinctness from T. clathratus. Kobelt has changed the name to 

 T. Dalli, on account of Eupleurn, miiriciforme, Brod., which lie 

 has included in Trophoti. 



T. OLAVATUS, Sars. PL 31, fig. 326. 



This is a smaller shell, with the whorls somewhat more shoul- 

 dered, the ribs fewer, more prominent and more spinose on the 

 shoulders, and the canal straighter than T. Mariciformis. It is 



