76 ROYAL SOCIETY OF CANADA 



(tVom 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. 



0. gravida and 0. 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. 



Tliere are three or four other forms for which I have not yet been 

 able to find satisfactory names, and I am inclined to the o])inion that 

 they belong to undescribed species. 



TRITOMUM, Cuvier. 



260. Tritonium oregonense, Eedtield, sp. 



Tflf<))i Ore(/o)u-)tsc, Redf., Ann. Lye. Nat. Hist. N.Y., vol. iv., no. .5, p. 16.5, 

 pi. xi., fig. 2a and 2b (1846). 

 = T. cancellatum, Midd. and others, but not of Laniarek. 



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, 1 dredged a living specimen with a colony of some 

 twenty or thirty specimens of T. unguicula attached to its haiiy 

 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 T. 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. 



TEIFOEIS, Deshayes. 

 261. Triforts adversa, Montagu, sp. 

 Muri'.c adversus, Mont. 

 This is recorded by Carpenter as being in Swan's Neeah Bay col- 



' ^'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 iJenita above :—Pecfe)i Ala.skensis ^ Placun- 

 nno)nia macrochisma, Modiolaria laevigata, Ciispidaria prcfinafa, Sij)honarla 

 T/iersites, Bela liolacca, Buccinnm jiercrassiun, Trifoniiini Orryonense, Natica 

 claasa, Aotuva patina, Solariella varicosa, and Lepidopleurus caiicellatus. 



