VANCOUVER ISLAND CRABS. 263 
Bates, F.R.S., who named and described the 
new and other species; I append the report he 
very kindly sent me. 
(The new species of crustaceans, collected on 
the east side of Vancouver Island, were some of 
them dredged in from eight to ten fathoms water ; 
the rest were collected between tidemarks). 
Mr. Spence Bates says, in speaking of the col- 
lection generally :—‘ The extremely opposite and 
varied localities in which many of the species 
here represented have hitherto been found, 
suggest the idea that Vancouver Island corres- 
ponds with the extreme limit between a northern 
and a tropical fauna. It is only in this way I 
can account for finding the representatives of 
tropical species with others that are found only 
(on the eastern coast of Asia) in the Arctic and, 
perhaps, North Atlantic Oceans.’ That he is 
quite correct in this assumption I think there can 
be no doubt; for not only does it apply to the 
crustaceans, but with equal force to all the 
molluscous groups. Several new species of 
shells, collected at the same time and in the same 
localities as the crustaceans, which were named 
and described by Dr. Baird, with appended notes 
by myself, and published in the Zoological 
Society’s Proceedings for the year 1864, are 
