PROFESSOR OWEN ON THE AYE-AYE. 55 



Ft. in. lin. 



Length of dorsal 046 



of lumbar 032 



of sternum 033 



of scapula ..." 020 



of clavicle 015 



of humerus 033 



of radius 033 



of ulna . 3 10 



of manus 049 



of pollex (including metacarpal) .... 1 8 



of index (including metacarpal) .... 2 9 



of medius (including metacarpal) .... 3 1 1 



of annularis (including metacarpal) ... 4 4 



of minimus (including metacarpal) ... 3 



of pelvis 030 



of femur 049 



of tibia 4 7i 



of pes 044 



• of hallux (metatarsal included) .... 1 10 



of fourth medius (metatarsal included) ..034 



§ 4. Teeth. 

 The dental formula of Chiromys is — 



1—1' 0' r" 0-0' 3-3' 



The incisors (PI. XX. figs. 6 &8, i, 'i) are long, large, much compressed, regularly curved 

 in segments of equal circles, the upper pair describing one-fourth, the lower pair one- 

 half of such circle. The upper incisor {ib. i), 1 inch 4 lines long, following the convex 

 border, is 3^ lines from before backward, and one line across (ib. fig. 4) ; the outer side 

 is flat, the inner side rather convex ; the worn cutting surface is concave, with the fore 

 part produced, forming an obtuse point. The front or convex border of the tooth is 

 coated by enamel, extending nearly a line's breadth upon the outer side (fig. 8, e), and 

 for a rather less extent upon the inner side : it is one-third of a line in thickness. The 

 dentinal body of the tooth (ib. d) has a central slightly discoloured axis of osteodentine. 

 The exposed part of the tooth measures six lines at the fore, and two lines at the back, 

 border in length ; the implanted part (fig. 8) extends through the premaxillary into the 

 maxillary to above the molars, where the pulp is situated close to the thin convex plate 

 of bone below the orbit. The pulp-cavity of the tooth is a long cone with a widely 

 open base ; the apex reaches to near the opening of the socket. As they approach tliis 

 outlet, the teeth converge and come into contact at the anterior half of their cutting 



