ANATOMY OF THE ANTHROPOID APES. 179 



with Hartmann's figure of the ear of the Common Chimpanzee ' and with Gratiolet's 

 and Alix's figures of the external ear of their supposed species T. auhryi. The ear is 

 relatively quite as large as in these Chimpanzees, nor does it present any marked 

 features which could distinguish it. This organ, however, varies in the Common Chim- 

 panzee, even if we allow T. aulmji to be a distinct species. The margin of the ear of 

 T. cahus agrees with that of T. auhriji in not being folded for the greater part of its 

 length. Both the tragus and the antitragus, particularly the former, are very much 

 marked, and they are divided by a very deep fossa. The margin of the ear is naked. 

 Superiorly the helix is continuous with the antihelix, the fossa of the helix (at the 

 letter H in the figure) becoming so shallow as to be practically non-existent. The fossa 

 of the antihelix (F) is well marked, and there is no lobule. 



§ 2. The Hand. 



The accompanying drawing (Plate XXII. fig. 1) illustrates the lines upon the palmar 

 surface of the hand, which were carefully drawn immediately after death. The figure 

 itself does away with the need of any elaborate description ; it may be compared with 

 the drawing (Plate XXVII. fig. 1) of the palm of the hand of the Orang-Outang. I 

 have also had the opportunity, through the death of a specimen at the Gardens on 

 November 16th, of comparing the Bald-headed Chimpanzee with the Common Chim- 

 panzee. The latter has been carefully described and illustrated by Alix ^ : his figure, 

 however, evidently gives only the chief lines, those lettered a, b, c, in the accom- 

 panying drawing of the right hand of " Sally." There are no important differences 

 that I can detect in the two Apes, except that in the Common Chimpanzee there are 

 two longitudinal lines running from a to the roots of the fingers, such as occur in Man 

 and in the Orang. The line e, which is not figured by M. Alix, seems to be of import- 

 ance, as it occurs in both Chimpanzees. There is, no doubt, just as much variation in 

 the lines on the hands of Apes as in the human hand. I do not, therefore, think it 

 worth while at present to do much more than direct attention to the drawing. I have 

 seen in the human hand the lines a and b running at right angles to the axis, as in the 

 Chimpanzee, instead of somewhat obliquely, as in my own hand, for example. 



§3. The Foot. 

 The accompanying drawing illustrates the plantar surface of the foot (Plate XXII. 

 fig. 2). There are two principal cross lines, lettered a and b, which appear to con-e- 

 spond to those similarly lettered in the hand, and which by their direction show the 

 prehensile nature of the foot ; so do the strongly marked lines upon the hallux, which 

 are hardly marked upon the pollex. The principal longitudinal line e is more marked 

 than in the Orang. 



' ' Der Gorilla,' pi. iv. 

 " Des lignes papillaires du main et du pied," Ann. Sci. Nat. t. is. 1868. 



' 2d2 



