yO DR. 1\ G. PARSONS ON THE [Jail. 15, 



the triceps; these fibres are slightly separate at their insertion 

 from the rest of the niuscle, and form what is sometimes called a 

 subscapularis accessorius. 



The levator anguli scapulse and serratus magnns agree with 

 Dobson's description but are practically one sheet. 



The steruo-scapular muscle is very large, and rises from the inner 

 half of the first rib and passes to the dorsum of the clavicle, into 

 which some of its fibres are inserted, constituting a subclavius ; 

 the rest of the fibres pass deep to the clavicle and are inserted into 

 the supra-spinous fascia. 



The deltoid has the clavicular and acromial portions small and 

 fused together ; the spinous portion, however, is distinct and un- 

 usually large. 



The triceps has an enormous long or middle head, which rises 

 from the whole length of the axillary border of the scapula ; the 

 external and internal heads are of ordinary size, and in addition 

 there is a fourth head from the angle of the scapula which reminds 

 us of the arrangement found in the Mustelidse among the Carni- 

 Yora \ and in most of the Edentata except the Sloths". It is 

 worthy of remark that all the animals mentioned are accomplished 

 diggers, as is ChrysocJdoris. 



The brachitdis anticus rises, as is usual in mammals, from the 

 back of the surgicfd neck of the humerus ; it winds round the 

 outer side of that bone and is inserted into the ulna. It is supplied 

 by a branch from the musculo-cutaneous ner\e, but after a careful 

 search on both fore limbs of two specimens I could find no supply 

 from the musculo-spiral. 



The epitrochleo-anconeus muscle is especially massive. 



The anconeus is present, but is only about a quarter as large as 

 the last. There is neither supinator longus nor extensor carpi 

 radialis longior, but the brevior passes from the external condyle 

 to the metacarpal bone of the medius. 



The extensor communis digitorum divides into two tendons for 

 the terminal phalanges of the medius and annularis. _ 



There is a separate muscle which is inserted into the metacarpal 

 bone of the annularis, and which probably corresponds to the 

 extensor minimi digiti, since in the second specimen it was inserted 

 into the terminal phalanx of the minimus. 



The extensor carpi ulnaris rises only from the external condyle 

 and is inserted into the base of the 5th metacarpal. 



The flexor carpi radialis was not enclosed in the osseous tunnel 

 described by Dobson in either specimen. 



The flexor carpi ulnaris comes from the great olecranon, and 

 not from the internal condyle ; it runs to the pisiform. 



The flexor sublimis digitorum is absent. 



The flexor profundus digitorum comes from the internal condyle 

 and olecranon and bones of the forearm ; the bony tendon men- 

 tioned by Dobson extends from the middle of the forearm to the 



1 P. Z. S. 1897, p. 394. ^ P. Z. S. 1899, p. 330. 



