1 894.] MAMMALIAN HAND AND TOOT. 363 



ulna to the aponeurotic sheaths of these digits, like the ext. pollicis 

 in Man. 



3. DlPUS JACTTLTTS. 



From the Pp., which is of enormous size, a strong muscle — 

 m. transversus carpi — arises ; it is inserted into the fifth meta- 

 carpal bone. 



A very large superficial muscle is situated on the flexor side of 

 the forearm and hand : it takes origin from the humerus and the 

 ulna and ends by tendons on the Pp. and on the top of the pisi- 

 form (Pin.). As there is another superficial muscle with distinct 

 tendons running down to the hand, and there are also flexor es 

 digitorum sublimis and profundus, I suppose that those two super- 

 ficial muscles are parts of the palmaris longus (the flexor digitorum 

 superficialis). 



I could not make further investigations, this animal not being 

 well preserved. 



d. UNGULATA. 



1. Hykax brijcei. 

 a. Flexores. 



Prom the tendons of the palmaris longus arises a flexor brevis 

 superficialis ; this is common in the foot, but very seldom met with 

 in the hand. 



As this animal has not four digits (Mivart) but five (Dobson), 

 there are muscular bellies to each digit except the third, i. e. four. 

 (Dobson describes only three.) 



The belly for the thumb is 3*5 mm. long and 2-5 mm. broad. 



The tendons of this superficial flexor are cleft and let pass the 

 deep tendons. 



The three inner bellies of the flexor brevis are supplied by the 

 medianus, the outer one (5th digit) by the ulnaris. 



Ulnaris interims consists of tivo muscles (taking origin from the 

 humerus and the ulna). 



ft. Extensores. 



The radialis extemus, situated under the ext. poll, longus, ends 

 by four tendons : — the first is inserted into the second metacarpal 

 bone ; the second and third into the third metacarpal ; the 

 fourth into the unciform. 



The ext. pollicis is very strong, its broad tendon ends on the 

 small rudimentary thumb (quite as in the Pp. in animals with 

 "five'"' digits). 



The ulnaris extemus is also very strong, it is inserted into the 

 fifth metacarpal, bone. 



The extensor digitorum communis is perforated by the (2) ten- 

 dons of the extensor minimi (el quarti) digiti. 



2. Elephas africanus (Embryo). 



(Roy. Coll. Surg.) The specimen was already dissected for the 

 Collection. 



