803 



5179. The cranium of an adult male Gorilla (Troglodytes Gorilla). 



The entire molar series is preserved on the left side ; the right anterior premolar, with the 

 incisors and large canine of both sides, hare been lost. The nasal portions of the maxillo- 

 premaxillary sutures remain, and show these bones to have been extended to join the nasals, 

 where they slightly expand. The anterior half of the sagittal crest is double or divided by 

 an angular groove. The base of the cranium is broken away, exposing the interior of that 

 cavity, and showing the oblique and sudden expansion of the tympanic end of the meatus 

 auditorius. 



Presented by Captain Harris. 



5180. A plaster cast of the cranium of an old male Troglodytes Gorilla. 



The angular groove is continued along the greater proportion of the sagittal crest. 



Presented by the Philosophical Institution of Bristol. 



5181. A plaster cast of the cranium of an adult, but younger, male Troglodytes Go- 

 rilla. 



The permanent dentition has been fully acquired. The sagittal crest is entire. 



Presented by the Philosophical Institution of Bristol. 



5182. A plaster cast of the cranium of an adult female Troglodytes Gorilla. 



It shows the smaller relative size of the canines, as compared with the molars and incisors, 

 in this sex. The temporal ridges extend to the sagittal suture, where they are divided by a 

 narrow groove, and are not developed into a crest. 



The originals of the three preceding specimens were obtained from the Gaboon river, and 

 are preserved in the Museum of the Philosophical Institution at Bristol. 



Presented by the Philosophical Institution of Bristol. 



5183. A cast of the cranium of a variety of the Troglodytes Gorilla, from the vicinity 

 of the river Danger, west coast of Africa. 



This cranium is larger than the largest of those, above described, from the Gaboon, and 

 differs remarkably in the proportions of some of its parts, not only of those that relate to 

 muscular attachments, but of parts exempt from the modifying influences of such. The bony 

 palate, for example, is longer, narrower and deeper ; the basioccipital is longer and narrower ; 

 the vaginal process of the tympanic is much more strongly developed, the whole under wall 

 of the auditory canal being, as it were, pinched up and produced downwards, the margin 

 becoming acute as it extends mesiad and terminating in front of the stylohyal fossa ; the ento- 

 glenoid process is smaller and shorter, not extending one line below the eustachian process of 

 the petrosal. 



When the upper surface of the cranium of the Gorilla from the river Danger is compared 



5 K2 



