] 896.] ANATOMY OF PETBOGALE XANXHOPUS. 697 



The Triceps is large and has the human attachments. 



The Anconeus and Epitrochleo-anconeits are well marked and 

 normal. 



The Pronator radii teres has only the condylar head, which is 

 inserted just above the middle of the radius. 

 - The Flexor carpi radialis is normal. 



The Palmaris longus is large and ends in the palmar fascia, 

 from the inner side of which a muscle rises, ending in tendons for 

 the proximal and distal phalanges of the little finger j this I regard 

 as the abductor minimi digiti. 



The Flexor carpi ulnaris rises from the internal condyle and 

 from the posterior border of the ulna ; but there is no distinct 

 head from the olecranon ; the absence of this is also noticed by 

 Macalister in the Great Kangaroo and Bennett's Wallaby. The 

 teodon is inserted into the pisiform bone, over which a sesamoid 

 cartilage is situated. 



The Flexor snhlimis digitorum is small, and rises from the 

 surface of the flexor profundus ; it quickly divides into three 

 sninll muscular bellies, the tendons of which pass to the index, 

 medius, and annularis. The descriptions of Meckel and Macalister 

 agree with this, except that they found tendons to all the fingers. 



The Flexor profundus digitorum rises from the internal condyle, 

 from the flexor surfaces of the radius and ulna in their upper 

 halves, from the inner side of the ulna, and from the olecranon 

 process. The mass divides into five strong tendons for the thumb 

 and fingers. 



The Lumbricales are arranged as in Man, except that the one 

 between the annularis and minimus tendons is wanting. This 

 description differs from the one given by Toung '. He describes 

 four lumbricales in Fetrogale, one of which is furnished to the 

 thumb. 



The Pronator quadratus is very thick, and occupies the lower 

 two-thirds of the forearm. 



The Supinator longus is inserted into the dorsum of the scaphoid, 

 Macalister describes it as being inserted into the first metacarpal 

 in the Wallaby, and into (he trapezium and first metacarpal in the 

 Great Kangaroo. Meckel also states that it is present in the 

 Kangaroo. 



The Extensores carpi radialis longior et brevior were present and 

 normal. Macalister says that they form a single muscle, which 

 is inserted into the 2nd and 3rd metacarpals. I have so often 

 seen this description of these muscles by different authors in 

 various animals, and, on trying to verify it, have always found the 

 two muscles separate, though closely adherent,. that I cannot help 

 suspecting that they are normally separate in the Kangaroos. 



The Extensor communis digitorum is normal, and goes to the 

 four outer fingers. ' 



' " Intrinsic Muscles of the Mammalian Hand," Journ. Anat. vol. xIt. 

 p. 156. 



Peoc. Zool. Soo.— 1896, No. XLV. .45 



