1902.] NATURAL SCIENCES OF PHILADELPHIA. 247 



propatagium ; the spinal accessory supplies the steruo cleido mastoid, 

 levator claviculce aud trapezius muscles; the axillary branch of the 

 brachial plexus, muscular fibres of the plagiopatagium ; the 

 internal cutaneous nerve, the humero and coraco-cutaneous mus- 

 cles; a branch of the brachial plexus gives off at the distal inser- 

 tion of the latissimus dorsi muscle the radial nerve, and below 

 divides into the median and ulnar nerves. The median ner\^e 

 perforates the supracondyloid foramen aud supplies thumb, index, 

 middle and inner side of ring finger ; the ulnar nerve, the outer 

 side of the ring aud little fingers and the muscular fibres of the 

 plagiopatagium. The lumbo sacral plexus is situated nearer the 

 tail than in most mammals, the last lumbar nerve supplying the 

 obturator cruralis and ischiadus muscles instead of the nerve emerg- 

 ing in front of the last two lumbar vertebrae as is usual. The 

 cruralis nerve supplies the plagiopatagium; the ischiadic supplies 

 the uropatagium. 



Alimentary Canal, etc. 



The palatal gmn is ridged, as in the lemurs. Parotid and 

 submaxillary glands were present, but so small as to readily escape 

 notice. The ducts are, however, proportionally large ; that of the 

 parotid gland crossed the masseter muscle aud was more than 

 25 mm. (1 inch) long; thai of the submaxillary gland opened into 

 the mouth far forward, and was almost as long as the duct of 

 sterno. 



The teeth of Galeopithecm have been described by Owen," 

 De Blaiuville, ^^ and others, aud the relation of the deciduous to the 

 permanent teeth more particularly by Leche." One of the most 

 interesting facts established by the latter observer is that the teeth 

 erupt late, so that the deciduous teeth and all the molar teeth 

 (except, perhaps, the upper third) are in use at the same time. 

 The most remarkable feature, however, in the dentition of Galeo- 

 pithecxis is the well-known comb-like form presented by the crown of 

 the first two incisors of the lower jaw, due to the deep extension of 

 the margiual notches upon the crown, and in respect to the extent 

 to which Ihis furrowing of the crown is carried unique in mammals. 



" Odontography, 1840-1845, p. 433. 

 ^'' Osteooraphie, 1841, p. 43. 

 " Op. cit., pp. 56-61. 



