1882.] ANATOMY OF PROTELES. 583 



large slip which is inserted into the annular ligament of the wrist. 

 In other respects it resembles that of H. crocuta. 



The extensor minimi digiti of Proteles resembles that of H. cro- 

 cuta in being inserted into the two outer toes, and differs from that 

 of Fiverra, which gives off slips to the three outer toes. 



The extensor indicis in Proteles joins the extensor tendon which 

 passes to the middle toe, and thus agrees with that of H. striata, and 

 differs from that of H. crocuta, which joins the extensor tendon of 

 the second toe. In Fiverra the tendon of this muscle gives off slips 

 to the 1st and 2nd toes. 



The palmaris longus of Proteles resembles that of H. crocuta, and 

 differs from that of H. striata, the tendon of which blends with the 

 superficial flexor tendons of the toes, as also from that of Fiverra, 

 which is double. 



The flexor carpi nlnaris of Proteles differs from that of i/'. crocuta 

 and H. striata in possessing an olecranoid as well as a condyloid 

 origin. In this respect Proteles resembles Fiverra. 



The flexor carpi radialis resembles that of H. crocuta in being 

 inserted into the base of the second metacarpal bone, and differs 

 from that of Fiverra, which is inserted into the first as well as the 

 second metacarpal. 



The flexores digitorum of Proteles closely resemble those of H. 

 crocuta for the most part, but differ inasmuch as that portion of 

 the common muscle which represents the flexor perforatus digitorum 

 divides only into three slips, which are distributed to the three 

 middle toes, while in H. crocuta it divides into four slips, which are 

 distributed to the four perfect toes. In this respect Proteles agrees 

 with Fiverra. In Proteles, moreover, the portion of the muscle 

 which represents the flexor perforans divides into five slips, one of 

 which passes to each of the toes; while iu H. crocuta the tendon of 

 the flexor perforans, in accordance with the reduction in number of 

 the toes, divides only into four shps. 



The lumbricales in Proteles are three in number, and pass to 

 the three outer toes. In H. crocuta there are four, one to each 

 toe. 



In Proteles the flexor pollicis is incorporated with the flexor 

 perforans digitorum ; whereas in H. crocuta, on account of the 

 rudimental hallux, the flexor pollicis is entirely deficient. In II. 

 striata, however, Meckel asserts the existence of this muscle. 



The interossei in Proteles, as in H. crocuta, are arranged iu two 

 layers, a superficial and a deep. The superficial layer includes two 

 muscles, which differ from the corresponding structures in H. crocuta 

 inasmuch as they both arise from the base of the third metacarpal 

 bone, instead of one from the third and the other from the fourth 

 metacarpal as occurs in H. crocuta. The one passes to be inserted 

 into the inner side of the base of the first phalanx of the fifth toe, 

 whilst the other is inserted into the outer side of the base of the 

 second toe. In H. crocuta these muscles are inserted into the outer 

 and middle toes respectively. 



The deep layer consists of ten muscles arranged in pairs, two to 

 Proc. Zool. Soc— 1882, No. XXXIX. 39 



