54 PROFESSOR OWEN ON THE AYE-AYE. 



the bone, is of equal length, and is inclined inward to the naviculare. The calcaneum 

 (rf) offers two articular surfaces to the astragalus, rather far apart ; the lever projects 

 moderately beyond the hinder surface, and is curved a little upward and inward. The 

 lower border is narrow and straight. The anterior surface for the cuboid is concave 

 at the lower part. The ento-cuneifortn {i) presents a concavity to the lower and outer 

 half of the great convexity of the naviculare ; it offers at the anterior half of its outer 

 part a trochlear surface, concave in one direction, convex in the opposite, to the powerful 

 hallux, between which and the second toe the ento-cuneiform projects upon the dorsum 

 of the foot. The meso- (m) and ecto- (e) cuneiform bones are narrower ; the outer one 

 (e) is of nearly equal length with the inner (i), the middle one (m) being the shortest. 

 The cuboid (6) is large and long, with the lower half of its calcaneal surface convex, 

 the upper half concave, for an interlocking joint with that bone ; it is almost square 

 and flat above, grooved externally and beneath for the peroneus longus, and, as usual, 

 it supports the two outer toes. 



The base of the metatarsal of the hallux {i) is broad, and its under border is produced 

 into contact with that of the second metatarsal. The base of this metatarsal {ii) is inter- 

 locked for a small extent between the ento- and ecto-cuneiforms ; it is half as thick as 

 the first metatarsal, and of the same length, but appears longer from its more advanced 

 articulation and the greater proportion of the shaft to the articular ends. The third 

 metatarsal {iii} is a little longer than the second ; the fourth {iv) has nearly the same 

 length, and so has the fifth (v) by reason of the backward production of the outer angle of 

 its base. The proximal phalanx of the fourth toe is the longest ; that of the middle toe 

 is about one line shorter ; those of the second and fifth are half a line shorter than that of 

 the third ; the proximal phalanx of the hallux is the shortest and thickest. The middle 

 phalanx of the second toe is the shortest ; that of the fourth, which is the longest, 

 exceeds it by three lines ; those of the third and fifth are of intermediate length. The 

 ungual phalanx of the hallux is short, broad, expanded, indicating the nail-shaped 

 appendage which it bears ; the ungual phalanges of the other toes are subcompressed and 

 obtusely pointed, conformably with their more claw-shaped weapons. 



The following parts retained their epiphysial condition : — the head of the humerus, 

 the carpal ends of the radius and ulna, the femoral condyles, the upper end of the tibia, 

 the lower end of both tibia and fibula. The animal may not, therefore, have attained 

 its full size. 



Ft. in. lin. 



Length of skull (including incisors) 3 5 



of vertebral column 2 3 6 



from occiput to sacrum 9 



of sacrum (by anchylosis) 16 



of tail 1 5 3 



of cervical 018 



