78 ROYAL SOCIETY OF CANADA 
266. BITTIUM ARMILLATUM, Carpenter. 
Rept. Brit. Assoc., 1863, p. 655 (August, 1864) ; and Ann. Mag. Nat. Hist., series 3, 
vol. xvii., p. 276 (April, 1866). 
Not rare among sponges in rock pools and under stones between 
tide marks, near Victoria. It is not uncommon in California. 
TRICHOTROPIS, Broderip and Sowerby, 
267. TRICHOTROPIS CANCELLATA, Hinds. 
Proc. Zool. Soc., London, 1843, p. 17; and Zool. Voy. Sulph., vol. ii., p. 39, pl. xi., 
fig. pal and 12 (1844). ; 
This shell has been dredged not rarely at Victoria, Departure Bay 
and Comox, in 10-30 fathoms, and at a greater depth. Dr. Dawson 
procured it at the Queen Charlotte Islands, in the Straits of Georgia, 
Queen Charlotte Sound, and in most of the localities in which he col- 
lected in 1885. Dr. Jeffreys (Brit. Conch., iv., 248) places T°. cancellata. 
in the synonymy of 7’. borealis, Brod. and Sby. 
268. TRICHOTROPIS INERMIS, Hinds. 
Proc. Zool. Soc. London, 1843, p. 18; and Zool. Voy. Sulph., vol. ii., p. 40. pl. xi., 
figs. 13 and 14 (1844). 
We have never found any shells that could be referred to this 
species, which is on our list on the strength of a few specimens collected 
by Swan at Neeah Bay. 
CÆCUM, Fleming. 
269, CÆCUM CREBRICINCTUM, Carpenter. 
Rept. Brit. Assoc., 1863, p. 655 (August, 1864) ; and Proc. Cal. Acad. Sci., vol. iii. (1866). 
This little shell has only been once found in British Columbia, and 
then but a single dead specimen. This was obtained by Dr. Dawson at 
Dolomite Narrows in 1878. 
BIVONIA, Gray. 
270. BIVONIA compacta, Carpenter. - 
Rept. Brit. Assoc., 1863, p. 654 (August, 1864); and Ann. Mag. Nat. Hist., series 3, 
vol. xiv., p. 427 (December, 1864). 
B. compacta is generally found upon shells of Pachypoma inæquale, 
and appears to have a range coextensive with that of that species. 
Dr. Dawson, however, found it at Discovery Passage on Trophon 
tenuisculptus, and at Quatsino Sound on Pecten hastatus. 
