76 ROYAL SOCIETY OF CANADA 
(from its large size and Tornatelloid shape) occurs rarely under stones 
at low tide at Victoria, Esquimalt, Salt Spring Island, Nanaimo, etc. I 
have never found more than one or two specimens of this species to- 
gether, 
O. gravida and O. straminea are smaller shells and have been dredged 
in various localities round Vancouver Island, and a single specimen of 
the last named was taken at the Queen Charlotte Islands by Dr. Dawson. 
There are three or four other forms for which I have not yet been 
able to find satisfactory names, and | am inclined to the opinion that 
they belong to undescribed species. 
TRITONIUM, Cuvier. 
260. TRITONIUM OREGONENSE, Redfield, sp. 
Triton Oregonense, Redf., Ann. Lyc: Nat. Hist. N.Y., vol. iv., no. 5, p. 165, 
pl. xi., fig. 2a and 2b (1846). 
= T. cancellatum, Midd. and others, but not of Lamarck. 
This species is very common at Victoria from low water mark to 
twenty or thirty fathoms. The dead shells often contain beautiful 
specimens of Crepidula navicelloides, and on one occasion, as mentioned 
on page 23 above, | dredged a living specimen with a colony of some 
twenty or thirty specimens of 7. unguicula attached to its hairy 
epidermis. 
I have not found this species at Nanaimo, but it appears again 
further to the north, having been taken by Dr. Dawson both at low 
water and by dredging in Johnston and Broughton Straits, in Goletas 
Channel, and at the Queen Charlotte Islands. 
Mr. Whiteaves in his paper in these Transactions (vol. iv., 1886), 
writes that this species is possibly only a local variety of the South 
American 7. cancellatum, of Lamarck, but Dr. Dall in the ‘ Proceedings 
of the United States National Museum’ for the same year! (1886, p. 213) 
has shown that the two species are quite distinct and in their geo- 
graphical range widely separated. 
TRIFORIS, Deshayes. 
261. TRrIFORIS ADVERSA, Montagu, sp. 
Murex adversus, Mont. 
This is recorded by Carpenter as being in Swan’s Neeah Bay col- 

1**Contributions to the Natural History of the Commander Islands, No. 6.” 
This paper contains many valuable notes on the northern distribution of our shells. 
The following species are quoted from Bering Island in addition to others already 
referred to in note under Penitella penita above :—Pecten Alaskensis ? Placun- 
anomia macrochisma, Modiolaria laevigata, Cuspidaria pectinata, Siphonaria 
Thersites, Bela violacea, Buccinum percrassum, Tritoniwm Oregonense, Natica 
clausa, Aemea patina, Solariella varicosa, and Lepidopleurus cancellatus. 
