FROM THE COAST OF BRITISH COLUMBIA. 125 
MopariA WOSSNESSENSKYI, Middendorf. Associated with the two preceding species, but 
apparently very much rarer than either. 
PLACIPHORELLA IMPORCATA, Carpenter. (Sp.) Johnstone Strait at station No. 19, one 
small, living specimen, with the girdle partly overgrown by a hydroid. 
CRYPTOCHITON STELLERI, Middendorf. Discovery Passage, between Vancouver and Cortez 
Islands, in about one fathom of water, one living specimen. Low tide, Johnstone 
Strait, two living specimens; and on Thurlow Island, east end of Johnstone Strait, 
four living shells. Low tide, Beaver Harbour, Vancouver Island, one living 
specimen. One living specimen, also, was dredged in Queen Charlotte Sound at 
station No. 15. 
Dr. Dawson states that this species is generally distributed on rocky ground 
at and below low tide mark, but that it is nowhere very abundant. This and the 
next-named species are cooked and eaten by Indians. 
KATHERINA TUNICATA, Sowerby. On rocks at low water all over the coast, and in some 
places very abundant. 
LEPTOCHITON CANCELLATUS, Sowerby. Queen Charlotte Sound at station No. 12, eleven 
small but living specimens, four of which have been identified with this species 
by Mr. W.H. Dall. Three specimens of a small, white Chiton, from station No. 14, 
appear also to belong to this species. 
LEPTOCHITON PUNCTATUS. N. Sp. 

Figs. 8 and 4.—Leptochiton punctatus. The figure on the left hand side represents the type 
specimen enlarged three diameters, and that on the right one of the central 
valves, enlarged eight diameters to shew the sculpture. 
Shell small, elongated, rather strongly elevated, back distinctly angulated ; 
colour, pale cream or nearly white, but with a few small patches of reddish-brown 
on the girdle, and a narrow and non-continuous series of variously interrupted 
and broken up yellowish-brown spots upon the median line of all the valves but 
the anterior one. Girdle squamose, the scales closely imbricating, much broader 
than high, and distinctly striated when viewed under an achromatic microscope 
with a half-inch objective. Mucro central and tolerably distinct where not worn 
off; anterior valve marked with faint but rather numerous radiating striæ and 
