NORTH-WESTERN SPECIES. 19 
of numerous specimens of a species of Dentalium 
strung together. The species bears an exceed- 
ingly close resemblance to that described by 
Linneus as Dentalium entalis (Entalis vulgaris of 
Risso, and of Dr. Gray’s “ Guide to Mollusca”), 
and appears to me, notwithstanding the difference 
of habitat, to be undistinguishable from that Euro- 
pean species. It has, however, been described 
by the late Mr. Nuttall as Dentalium pretiosum ; 
and a figure has been given of it by Mr. Sowerby, 
in one of his late numbers of the “ Thesaurus 
Conchyliorum.” 
‘From a careful comparison of the typical 
specimens of D. pretiosum, in Mr. Cuming’s col- 
lection, there can be no doubt of the identity of 
that species with the specimens brought by Mr. 
Lord from Vancouver Island; those in Mr. 
Cuming’s collection are said to be from California. 
‘In examining the old river gravels on the 
banks of the Columbia River, alluded to in vol. ii. 
along with numerous other articles, such as human 
bones, flint instruments, &c., Mr. Lord found a 
number of specimens of a species of Dentalium 
considerably eroded and worn, which I have 
compared with some in Mr. Cuming’s collection, 
and find identical with the Dentalium striolatum 
of Stimpson, from Newfoundland. I strongly 
c 2 
