695 



4398. The skull, vertically and longitudinally bisected, of a Wild Dog (Canis fami- 

 liaris). 



The bony tentorium projects from near the middle of the occipital wall, and does not reach 

 the petrosal ; but the ridge of the petrosal is thin, and produced into the membranous tento- 

 rium. The petrosal fossa is narrow and deep: the bone is perforated near its apex, which 

 projects freely forwards and inwards ; it is merely notched in the Fox, as in the Otter, 

 Badger, and Coati. A vertical vascular groove divides the prosencephalic from the rhinence- 

 phalic compartments. The lateral sinus perforates the exoccipital, but both orifices of the 

 canal are within the cranium ; one branch of the lateral sinus descends and opens externally 

 at the base of the squamosal behind the postglenoid process. 



From the East Indies. 



Purchased. 



4399. The skull of the Shepherd's Dog (Canis familiaris). 



It differs from the two preceding in the somewhat larger development of the cerebral cavity 

 and the small expanse of the frontal sinuses, but agrees with them in size, which is that of 

 the Dingo. 



Purchased. 



4400. The skull of a Dog, from a bog near Drogheda. 



It corresponds most closely with that of the Shepherd's Dog, and, like it, differs from those 

 of the Wild Dog, Nos. 4397 & 4398, in the greater expanse of the cerebral cavity. 



Presented by the Earl of Enniskillen, D. C.L. 



4401. The skull of a similar variety of Dog, from a bog near Drogheda. 



It has feebler zygomata and somewhat narrower jaws, and probably belonged to a female. 



Presented by the Earl of Enniskillen, D. C.L. 



4402. The skull of a Mastiff (Canis familiaris, var. anglicus). 



It differs from that of the Shepherd's Dog in the greater elevation of the frontal region of 

 the cranium, and in the deeper concavity between that and the facial portion. The nasal 

 bones extend further back than the maxillaries. 



Hunterian. 



4403. The skull of a large Newfoundland Dog (Canis familiaris, var. extrarius). 



In this variety the frontal region is more elevated than in the Shepherd's Dog, but less 

 suddenly so than in the Mastiff. In comparison with the skull of a Wolf of about the same 

 size, the difference is seen in the greater breadth and depth, with the minor length of the 

 jaws, the more convex inferior contour of the lower jaw, the greater elevation and breadth of 

 the frontal region, the minor expanse of the acoustic bullae, and the greater breadth of the 

 condyles of the lower jaw. 



Purchased. 



