NEW SPONGILLA. 79 



FIBER OSOYOOSENSIS. (LORD, up. nov.) 



Sp. char. In total length 3^ 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 Fiber zibethicus in being much smaller, 

 2 inches in length, 1 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 Hawkinsii, 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, 



