NEW SPONGILLA. 79 
FIBER OSOYOOSENSIS. (Lorp, sp. nov.) 
Sp. char.—In total length 34 inches shorter than Fiber zibethicus 
(Cuv.) ; in general size much smaller. General hue of back jet- 
black ; but, the hair being of two kinds, if viewed from tail to 
head it looks grey—the under fur being fine, silky, and light-grey 
in colour; concealing this on the upper surface are long coarse 
black hairs ; the belly and sides somewhat lighter ; head broad and 
depressed ; neck indistinct ; ear small, upper margin rounded ; eye 
small and black ; the feet, legs, and claws are so exactly like those 
of Fiber zibethicus that it would be useless to describe them again ; 
whiskers long, and composed of about an equal number of white 
and black hairs; incisors nearly straight, on the external surface 
orange-yellow. 
The skull differs from F%ber zibethicus in being much smaller, 
21 inches in length, 13 inch in width, very much shorter from the 
anterior molar to incisors ; nasal bones much more rounded at their 
posterior ends, the superior outline less curved ; postorbital process 
not nearly so much developed; the cranial portion of the skull in 
its upper outline is much less concave, and smoother ; superior 
outline of occipital bone not so prominent or strong; incisors 
shorter and much straighter ; molars much smaller, but in general 
outline similar. 
In this lake I obtained a new species of fresh- 
water mollusc, which Dr. Baird, who kindly de- 
scribed it for me, named Succinea Hawkinsiz, in 
honour of the Commissioner, Colonel Hawkins. 
It will be found carefully described in the Ap- 
pendix. 
I also observed a spongilla growing round the 
stalks of the rushes, much larger, and more sponge- 
like in character, than any spongilla I had pre- 
viously seen. There was no lack of it in many 
places; the rush-stalks were all covered with it, 
