the Wombat and Tasmanian Devil. 163 



— one from the internal condyle, and one from the olecranon 

 process ; this muscle is inserted into the fifth metacarpal bone. 

 In SarcojjhUus it is also bicipital, and is inserted into the 

 pisiform bone, sending a slip (ulnaris quinti digiti) to the first 

 phalanx of the little digit. This muscle is very large in the 

 Opossum and Phalanger ; it has no condylar origin in the 

 Great Kangaroo and Wallaby. 



The flexor sublimis digitorum arises in the Wombat from 

 the inner condyle, inseparable from the profundus ; but its 

 tendons are small and separate, and lie on the surface of the 

 deep flexor tendons ; they pass to the fingers, and are perfo- 

 rated by the deep flexor ; they terminate in the digital apo- 

 nem-oses at the base of the first phalanges. In Sarcophtlus 

 there are three portions in the flexor muscle, and the super- 

 ficial of these is the flexor sublimis ; the tendons of the sub- 

 limis are arranged exactly as in the Wombat. In the Wallaby 

 the sublimis arises from the inner condyle inseparably united 

 to the profundus ; but from the tendon of the common flexor 

 above the wrist the fleshy fibres of the sublimis arise and form 

 a lower belly, which sends tendons to all the fingers but the 

 first. This arrangement can be understood in the light of the 

 digastric modification of the flexor sublimis found in Loris 

 and described as an anomaly in human anatomy. The 

 muscle is quite distinct in the Opossum, and has perforated 

 tendons. 



The flexor profundus and flexor poUicis longus are more or 

 less united in all. They are comparatively separate at their 

 origin in Sarcophilus^ but indivisible in the Wombat and 

 Wallaby. The tendons in all are five, and pass to tlie five 

 toes. 



The supinator longus is rudimentary in Sai-copMlus, and 

 is represented by a band of superficial muscular fibres arising 

 from the fascia over the deltoid muscle, and very slightly from 

 the supinator-ridge of the humerus inserted into the fascia over 

 the thumb. In the Wombat it is also superficial and thin, 

 fascial in origin mainly and in insertion exclusively. In the 

 Ilacropus Bennettii it is larger, and has a bony insertion into 

 the metacarpal bone of the pollex. In the Giant Kangaroo 

 it is purely bony in attachments, and is inserted into the 

 trapezium and pollex. In the Opossum and Phalanger it is 

 inserted into the trapezium and external lateral ligament of 

 the wrist. 



The extensor carpi radialis is a single muscle in Macrojms 

 Bennettii, theWombat, Sarcojjhilus, Phalanger, and Giant Kan- 

 garoo, and is inserted into the bones of the second and third 

 metacarpals. In the Opossum it has a single tendon only. 



