722 



4653. The right humerus, longitudinally bisected. 



4654. The right radius, longitudinally bisected. 



4655. The right ulna, longitudinally bisected. 



4656. The right femur, longitudinally bisected. 



4657. The right tibia, longitudinally bisected. 



4658. The cranium of a Lemur. 



The left palatal, maxillary, premaxillary, and both nasal bones have been removed to show 

 the extent of the yomer and the simple form of the superior turbinals. The left squamosal 

 has been removed to show the small extent of the cranial cavity, which it closes ; the articu- 

 lation of the alisphenoid with the parietal ; and the termination of that division of the lateral 

 sinus which opens outwardly by the postzygomatic foramen. 



Presented by Prof. Owen, F.R.S. 



4659. The cranium of a Lemur. 



It has been transversely bisected through the petrosal bullse. 



Presented by Prof. Owen, F.R.S. 



4660. The separate bones of the cranium of a young Lemur Catta. Purchased. 



4661. The skull of the Ruffed-Lemur (Lemur Macaco). 



The cranial cavity is exposed by a section of the calvarium. The sockets of the teeth of 

 the left side are laid open. The petrosal has a large and very deep cerebellar fossa : a short 

 tentorial ridge projects anterior to this. There is a low postclinoid ridge. The lateral sinus 

 pierces the petrosal where it joins the parietal and meets a second venous channel traversing 

 the middle fossa of the cranium to terminate at the postglenoid foramen. The foramen ovale 

 is a small fissure between the petrosal and alisphenoid less than the foramen rotundum, which 

 is close to the foramen lacerum anterius : the outlet of the foramen ovale is in the Eustachian 

 fossa. 



Purchased. 



4662. The naturally articulated bones of the thorax, with six cervical and two lum- 

 bar vertebrae, of a Lemur. 



In this specimen the dorsal vertebrse are twelve in number, the thirteenth from the neck 

 being unequivocally a lumbar vertebra with short, broad, depressed diapophyses. The 



