REPORT ON THE MARSUPIALIA. 13 



The anconeus intemus is very generally present throughout the Marsupialia. Mr. 

 Galton figures it in the Wombat; 1 Gruber in the Dasyurus viverrinus; 2 Cuvier and 

 Laurillard in the Giant Kangaroo; 3 whilst it is described both by Macalister 4 and 

 Young 5 in the Koala, and by the former author in the Tasmanian Devil. 6 



Forearm. 



In the Thylacinus we find the following muscles upon the extensor aspect of the 

 forearm : — 



Superficial Muscles. 



1. Supinator longus. 



2. Extensor carpi radialis longior. 



3. Extensor carpi radialis brevior. 



4. Extensor communis digitorum. 



5. Extensor digitorum secundus. 



6. Extensor carpi ulnaris. 



Deep Muscles. 



1. Extensor ossis metacarpi pollicis. 



2. Extensor secundi internodii pollicis. 



3. Supinator brevis. 



In the Cuscus the same muscles are found on the extensor aspect of the forearm as in 

 Thylacin us. 



In Phascogale the extensor carpi radialis longior and brevior are represented by a 

 single muscle, whilst the extensor carpi ulnaris is split up into two factors. The deep 

 muscles are the same as in Thylacinus. 



Supinator longus. — In the Thylacine this muscle is very feebly developed. It con- 

 sists of a narrow fleshy baud (PL I. fig. 5, s.l.) which springs from the upper part of the 

 external supracondyloid ridge of the humerus. The delicate thread-like tendon in which 

 it ends passes under cover of the extensor ossis metacarpi pollicis, and is inserted in 

 great part into the posterior annular ligament, but also slightly into the styloid process of 

 the radius. 



1 Note on the Epitrochleo-anconeus or anconeus sextus (Gruber), Jour, of Anat. and Phys., vol. ix., pi. ii. fig. 3. 



2 Ueber den Musculus Epitrochleo-anconeus des Menschen und der Saugethiere, Mem. de l'Acad. Imp. des Sci. de 

 St. IV'tersbourg, torn, x., No. 5, 7th series. 



3 PI. clxv. fig. 1, n. 



4 On the Muscular Anatomy of the Koala, Annals and Magazine of Natural History, vol. x., 4th series, p. 130. 

 6 On the Muscular Anatomy of Koala, Jour. Anat. and Phys., vol. xvi. 



c Further Obervations on the Myology of Sarcophilus ursinus, Annals and Magazine of Natural History, vol. x., 

 4th series, p. 19. 



