104 ME. A. L. ADAMS ON THE OSTEOLOaY OF 



(a h) is relatively larger, the intermediate concavity being more shallow, in fig. 12 than 

 in fig. 11. 



The external part of the unciform-facet has been recently broken ofi" in fig. 12 ; but 

 it is preserved in the other specimen, and shows a less pointed extremity than in fig. 11, 

 which is rather more prominent than displayed in the drawing ; both, however, have 

 been slightly abraded, so that here the distinctions may not have been so great as the 

 specimens now indicate. 



The dimensions of fig. 12 and its sister specimen are: — length 3*2 (3-1); breadth, 

 middle of shaft, 1'9 (1"8); thickness at midshaft 1*4 (1'3); fourth metacarpal facet 1'3 

 by '4 (I'l by '3); unciform surface 1'6 by 1'4 (1'5 by 1'4); distal articular surfaces 

 1-6 by 1-4 (lost in the other); facet for first phalanx 1-1 by 1 inch (lost in the other). 



These bones are smoother on their upper and outer aspects, and have less the charac- 

 ters of the old bone than the two just described; still their epiphyses are completely 

 consolidated. 



A most diminutive fifth metacarpal, at the same time (like the other bones of the 

 same foot) with every indication of consolidation of its epiphyses, is shown in PI. XXI. 

 fig. 6. It is described with them at p. 77. 



A Type. — The fifth metatarsal PI. XX. fig. 7 is the sole representative of this bone 

 in my collections. In all the characters which appear to distinguish the African from 

 the Asiatic, the specimen in question is decidedly akin to the former, and is even more 

 divergent, being as broad as it is long; moreover the navicular aspect has also the 

 outline of the African. In relative dimensions it equals those of the recent Asiatic Ele- 

 phants with which the fifth metacarpal has just been compared, and even the Sumatran 

 fifth metatarsal in B.M., which is 2 inches in length, with a proximal articulation of 

 1'6 by 1-2, and a distal of 1-9 by 1'7. 



The following are the dimensions of fig. 7 — length 2 inches, breadth (midshaft) 1-7, 

 thickness (ditto) 1-3, naviculare facet 1'3 by 1-1, distal articular surfaces 1*7 by 1'5, 

 surface for first phalanx 1'3 by I'o (about). The rugosities on the upper and external 

 sides are pronounced. Here we see another convincing proof of the great breadth 

 or the bones to the length as compared with recent species. 



The phalanges are divisible into the following : — 



A Type. — PI. XX. fig. 10 is unquestionably the first phalanx of the fifth metacarpal 

 left foot. A portion of the internal and lower surface of the distal articulation has been 

 recently removed ; but enough is preserved to show that the bone was more conical than 

 in either of the recent species ; and whilst it widely difi"ers from the Asiatic, as shown 

 in the woodcut no. 1, fig. 9, it is unlike the African in being shorter and stumpier, 

 although they agree in the absence of the mid contraction of the shaft so apparent in 

 the former and in the proximal phalanx of the fifth metatarsal of the two recent species. 

 It is evident that the second phalanx must have been diminutive, from the small arti- 

 cular surface, which, as before observed, is also minute in the Asiatic; but, as few 



