TROPIION. 141 



uuiforml}' to the description of 'r.iniiicatux^ I mi specimens from 

 Arctic American localities vary all the way in size from the 7'. 

 clathratus or large form (eciuivalent to T. li/ratus, Lam., fig. .312, 

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

 ponding to T. truncatus', and the ribs vary greatly in number, 

 not only on difterent specimens, bnt even on different whorls of 

 the same species. Marex BamffitM> of Montagu is a synonym of 

 the English tyi)e. A scalariform variety, with excavated sutures, 

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

 called T. Gunneri by Loven, and T. muUicostalus (fig. 31()). 

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

 as a variety. 



Inhabits from Spitzhergen ; Norway ; Great Britain ; Iceland ; Arctic 



America, south to Massachusetts ; Newfoundland ; W. Coast *>/ 



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 oldei- 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 separated the large and small forms in his British 

 Conchology, l)ut has more recently thought fit to unite them. 



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

 able froiji the shouldered carinate form of Gould's Fu,^ui< scalari- 

 fotmis. It is reported from .Ta])an, l)y A. Adams. 



T. MuRiciFORMis, Dall. PI. ol, fig. 813. 

 Very like Busycon ca,rica in form. 

 Length (apex broken ott'), 40 mill. 



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



Large and peculiar as is this shell, 1 very much doubt its dis- 

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

 T. Dalli., on accovmt o\' Eupleura nmriciforme., Brod., which he 

 has included in Trophon. 



T. CLAVATUS, Sars. PI. 31, fig. 326. 



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

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

 shoulders, and the canal slraighter than T. Muriciformis. It is 



