new Species of Bassaricyon. 233 
strongly inflated antero-internally alongside the carotid 
foramen. 
Measurements of skull of type-specimen.—Greatest length 
78 mm.; condylo-basal length 73°5 ; breadth across zygo- 
mata 50, interorbital 19, of muzzle behind canines 16°5, of 
premaxille across incisors 9, of brain-case 35, of palate 17, 
outside first molars 27, of posterior palate across notches 10; 
length of palate 40, of cheek-teeth (including canine) 26. 
Hab. Bastrica woods, Essequibo River, British Guiana. 
Type. Adult female, which lived in the Zoological Gardens 
from 1894 to 1900. ‘The skull shows no trace of sutures, 
but the teeth are unworn and the temporal crests form two 
low, widely separated ridges as wide apart above the 
squamosal as the width of the forehead. It may be added 
that this skull shows no indication of the osseous deterioration 
and malformation so well known in many mammals which 
have been captured young and kept for some time in captivity. 
Resembling B. gibby, and differing from B, allent and 
B. richardsoni, in the width of the palate measured across 
the outer edge of the first molars, also in the breadth of the 
posterior portion of the palate and of the mesopterygoid fossa, 
but differing from B. gabbi in the flatness of the interorbital 
region, the uneven curvature of the upper edge of the brain- 
case seen in profile view, the somewhat constricted and more 
prominent occiput, and in the shape of the zygomatic bar, 
which is much more highly arched, especially the portion 
behind the postorbital angle. It further differs from thie 
three species in the downward extension of the pterygoid, 
the apex of which may be seen, in profile view, to project 
much lower than the process formed by the posterior rim of 
the glenoid. The bulla also is more inflated anteriorly than 
in B. gabbi, B. richardsoni, and B. alleni, its lowest point, in 
profile view, being almost immediately below the auditory 
meatus, and not below the mastoid as in those species. In 
the flatness of the forehead B. beddardi seems to resemble 
B. allené; but, in addition to the differences pointed out 
above, the former may be at once distinguished from the 
latter by the shape of the muzzle of the skull, which is a 
little narrower and more depressed even than in B. gabbz. 
The mandible has a more couvex inferior border than in the 
other species, the tooth-bearing portion of the ramus being 
more curved. In these respects B. beddardi is most like 
B. gabbi, but the summit of the coronoid is very different 
in shape in the two and the condyle is much less prominent 
than in B. gabbi. Thomas described B. medius as differing 
from B. gabbi in having the rounded character of the skull 
Ann. & Mag. N. Hist. Ser. 9. Vol. vii. 16 
