OF THE WOMBAT, KOALA, AND PHALANGEES. 877 



it is separate from it in Phascolomys and the Phalangers. 

 Macalister (18) showed that the conditions in Phascolomys are 

 similar to those in many Polyprotodonts and Diprotodonts. 



T'rice^^s (text-figs. 36-38): — In Phascolomys I observed the long 

 head arising from the lateral two-thirds of the axillary border of 

 the scapula, and the humeral heads are indistinguishably fused. 

 Macalister (8) stated that the long head arises from more than a 

 third of the bone. In Phascolarctos the long head arises from a 

 third of the axillary border of the scapula, and it passes to the 

 distal third of the arm before it unites with the fused humeral 

 heads. In Phalanger and Pseudochirus the long head also arises 

 from a third of the axillary border, but it unites high up with the 

 humeral heads. 



. Anconei: — The anconeus internus, according to Cunningham (2), 

 is generally present in the Marsupialia. In Phascolomys, 

 Phalanger, and Pseudochirus it is a marked parallel -sided band 

 running from the internal condyle to the olecranon, and the 

 ulnar nerve passes imder cover of it. In Phascolarctos it appears 

 to be more continuous with the dorso-epiti'ochleaiis. In Phasco- 

 larctos and Phascolomys it is not connected to a fibrous band 

 which gives origin to the flexor carpi ulnaris I'he anconeus 

 externus is present in all forms, but it is least in Phascolomys, in 

 which it has no connection with the triceps. 



Pronator Radii Teres : — Cunningham (2) pointed out that this 

 muscle has no coronoid head in the Marsupialia. The inseitions 

 vary. In my specimens the conditions are as follows : — 



Phascolarctos : to middle two-fourths of the radial shaft. 

 Phalanyer : to distal two-thirds of the radial shaft. 

 Pseudochirus: to distal tv/o-thirds of the radial shaft. 

 Phascolomys : to distal half of the radial shaft. 



ilexor Carpi Radialis: — This muscle is well developed. It 

 exiiibits a variable amount of fusion with the other members of 

 the superficial flexor group, but the fusion is least in Phascolarctos. 

 It is inserted into the base of the second metacaipal in Phasco- 

 lomys, Phalanger, and Pseudochirus, but it runs to the third 

 metacarpal in Phascolarctos. 



Palmaris Longus is present in all. In Phascolomys Macalister 

 (18) described a true palmaris longus and a palmaris accessorius, 

 both arising from the internal condyle. In my specimen the 

 accessorius does not arise from the condyle, but it is implanted 

 into the side of the tendon of palmaris longus in the distal third 

 of the forearm ; and it has a, very slender tendon which runs to 

 the palmar pad. In Phascolarctos, Phalanger, and Pseudochirus 

 there is no trace of the accessorius. 



ilexor Carpi Ulnaris : — In all the animals described in the 

 present paper the insertion is into the pisiform bone. But 

 Macalister (18) described it as being attached to the fifth meta- 

 carpal in Phascolomys, Young (14) descx'ibes it as giving off 



