9% ROYAL SOCIETY OF CANADA 
TRACHYDERMON, Carpenter, 
329, TRACHYDERMON DENTIENS, ‘ould, sp. 
Chiton dentiens, Gould, Proc. Bost. Soc. Nat. Hist., vol. ii., p. 145 (July, 1846) ; and 
U.S. Expl. Exped., Mollusca, p. 321, figs. 433-433b (1852). 
=Trachydermon pseudodentiens, Cpr. 
I have a few specimens of this species found on rocks between tides 
near Victoria, The shell does not seem to have been recognized by Mr. 
Whiteaves in Dr. Dawson’s collections, 
330. TRACHYDERMON FLECTENS, Carpenter. 
Rept. Brit. Assoc., 1863, p. 649 (August, 1864); and Proc. Acad. Nat. Sci. Phila., 
1865, p. 60. 
A pretty little species collected here by both Lord and Kennerley 
(teste Carpenter). I have taken it not rarely, by dredging, at Victoria 
and Departure Bay ; but strangely enough Dr. Dawson did not obtain 
it during his northern trips, nor has Dr. Newcombe found it in any of 
the localities in which he has collected. 
TONICELLA, Carpenter. 
331. TONICELLA LINEATA, Wood, sp. 
Chiton lineatus, Wood, Gen: Conch., p. 15, pl. 2, figs. 4-5 (1815). 
Very common between tides on all our coasts. It is a very variable 
species but always readily separable fromits allies. A pretty variety, of 
which I took two or three specimens at Nanaimo last year, is, when alive, 
wholly bright blue without any trace of the characteristic lineation. Dr. 
Pilsbry calls this species “ One of the handsomest north Pacific Chitons,” 
and so it undoubtedly is. 
332. 'TONICELLA SUBMARMOREA, Middendortff, sp. 
Chiton submarmoreus, Midd., Bull. Acad. Sci. St. Peters., vol. iv., no. 8 (1846); and 
Mal. Ross., pt. 1, p. 98, no. 4 (1847). 
Of this species only a few specimens have so far been taken at Vic- 
toria, Departure Bay and Salt Spring Jsland (G.W.T.) and Galiano 
Island (Newcombe). 
Carpenter placed 7. submarmorea on our Vancouver list on the 
strength of specimens collected by Swan, but added a note ‘ perhaps = 
lineata without the lines.” It is however easily distinguished from 
lineata, as Pilsbry remarks, by its microscopic granulations, and from 
the following species, 7’. marmorea, by its different colour pattern. 
