()82 



REPORT — 18C3. 



Call fo mid n .•.•/ )<r/V,s'. 



Lioonrdium f^iibslrialtim. 

 l-uiiutia Lowisii. 

 Nassa luciidica. 

 Amyola (^species) . 



U. S. AfhDitir itprcies, 



}>. ]\rortoui. 

 1 ,. hi>ros. 



N. (rivitlata. 

 Aniyi'hi (^species). 



126. When. liDwovor. vro approach the region in which boreal and sub- 

 boival forms occur, many spocios arc found in common, and botwoon others 

 thore is but sUght difloronce. Yot ovou horo there are more Ihitisli tbau 

 Isew I'nijiland species in the West-ooast fauna. As might bo expected, tlie 

 British species are for the most part those which are also found fossil, and 

 tlici'cfore have had time to diffuse themselves wiik^y over the hemispliere. 

 It in, however, remarkable that many Crag species liave reached Ivistcru 

 Asia ami West America which are not fouiul in (irand INIanan and New 

 England. It is also extraordiiuiry that certain special generic forms of the 

 Crag, as AcHa, Miodon, J'l'rdcon^ia, and iSoltd-lclhi, reajjpear in the North 

 Pacitic*. When seeking for an exphmation of so remarkabhi a connexion 

 between faunas widely removed in space and time, the correlative fact must 

 be borne in mind, that the northern drift t, so widely diffused over Europe 

 and Eastern America, has not yet been traced in the western region. The 

 following Table exhibits, not only the id'Mitical but the simihir species be- 

 longing to the nortliorn faunas of the Atlantic and Paeifie. In tlie Asiatic 

 column, K denotes that the species occurs in the Kamtsehatka region, J iu 

 Japan. In the second column, V signifies the Vancouver district, C the Cali- 

 fornian, and I the iSta. Parbara group of islands. The species marked F 

 an> also fossil. In the third column. C denotes the Coralline, 11 the Red. and 

 !M the Mannnaliferous Crag. The f(>urth contains the species living iu the 

 ]>ritish seas ; the tiflli, on the Auu-rican side of the Atlantic, Or. standing 

 for Greenland. 



* Wliotlicv thciv bo any similar wrrospondoiuv ih tlie Polyaoa is not yot kmnvn. Mr. 

 Busk not liavinsi had limo to oomploto his oxaniination. 



t Sw. in th^s connexion, a vory aocnrato Tabic of the spocios which travel roimd 

 Oapo Cod. witli tlioir distribution in exist ing seas and over ditVeront provinces of <Jm 

 vari(nis drift -formations in the Old and New World, by t>audersou Smith, iu Aim. Ijyo. 

 Kat. Hist. N. York. vol. vii. 18l>0. p. 1(>(). 



J From the Coralline Crag. Looks more like ovitlis, 



1G8 



