21 



Genus Hyaena. 



105. The upper portion of the cranium of the Cave Hysena (ffycena spelaa, 

 Cuv.), with the right occipital condyle and right glenoid cavity : the cere- 

 bral cavity is exposed, on the inner surface of which the convolutions of 

 the brain are strongly moulded : the bony tentorium is well shown, as also 

 the great extent of the air sinuses which are continued beneath the 

 sagittal crest as far as the occiput. The tympanic bulla is broken open, 

 showing the inverted bony frame for the attachment of the membrane or 

 ear-drum. From the length and elevation of the parietal crest and of 

 those on the occipital surface of the skull, the specimen may be con- 

 cluded to have belonged to an aged individual. It is larger, but not in 

 a very great degree, than the skull of a full-grown Spotted or Cape Hysena 

 (Hyana crocuta), from which it differs chiefly in the smaller interspace 

 between the occipital condyle and the occipito-mastoid process, and in 

 the greater relative extent of the posterior plate of the glenoid cavity. 



This fossil is from the cavern in the limestone quarries of Oreston, 

 near Plymouth, marked B in the plate 6. of the Memoir by Messrs. 

 Whidbey and Clift above quoted. The fossil itself is figured in plate 11. 



Presented by Sir John Barroiv, F. R. S. 



106. A portion of the cranium with both occipital condyles and the left glenoid 

 cavity of a younger Cave Hyaena. The nonage of the individual to 

 which this fossil belonged is shown by the small size of the sagittal and 

 occipital crests, and the limited extent of the nasal sinuses, which are not 

 continued backwards beyond the frontal bones. 

 From the cave B, at Oreston. 



Presented by Sir John Barrow, F.R.S. 



10"- The posterior part of the left parietal bone of a young Cave Hyaena 

 {HycBna spelcea), from the bone-cave at Kirkdale, Yorkshire. 



Presented by John Gibson, Esq., F.G.S. 



108. A portion of the left superior maxillary bone of the Cave Hysena, with 

 the canine and molar teeth. The only difference which this specimen 

 presents when compared with the Spotted Hyama {Hyana crocuta), is a 



