1881.] OF CKRCOPITHECUS CA.LLITRICHUS. 817 



C. caUitrichus (Dobsoii). C. sahceus (Mivart) . 



1. Omo-hyoid present. 1. No onw-hyoid. 



2. Trapezius partially inserted, into 2. Trapezius had no insertion into 

 the clavicle. the clavicle. 



3. Pectoralis major arose from al- 3. Fectoralis iitajor without the cla 

 most the whole length of the clavicle. vicular origin. 



■1. Pectoralis minor consisted of two 4. Pectoralis miiior consisted of two 



very distinct portions, one of which very distinct portions, which were 



was inserted into the capsular ligament, together inserted into the capsular 



the other into the edge of the bicipital ligament. 

 groove. 



5. Levator claviciilce partially in- 5. Levator claviciilx not at all in- 

 serted into the clavicle. serted into the clancle. 



6. Extensor ossis mctacarpi pollicis 6. Extensor ossis metacarpi pollicis 

 had but a single tendon. gave rise to two tendons. 



7. Extensor indicis gave off (in addi- 7. Extensor indicis gave off tendons 

 tion to those for the second and third to the second and third digits only. 

 digit8)a tendon for the fourth digit also. 



8. Lunibricalcs had similar origins 8. ZM?«inm?es had different origins 

 in both feet. in both feet. 



9. Plantar interossei inserted by 9. Plantar interossei inserted like 

 pairs into the sides of the proximal the palmar intcroosei of the human 

 extremities of the phalangeal bones. hand. 



Other less important differences might also be noted in the con- 

 nections of other mnscles as described ; but these might be found 

 between any two specimens of the same species. If Mr. jNIivart's 

 specimen really belonged to the same species as mine does, the mus- 

 cular differences above noted are exceedingly remarkable. 



Since writing the above, I have been enabled, tlirough the kind- 

 ness of Mr. W. A. Forbes, Prosector to the Society, to dissect 

 another specimen of this species, a young female which had lately 

 died in the Society's Gardens. The general conformity in its mus- 

 cular structure with that of the robust male above-described was 

 remarkable, the slight differences observable being almost confined 

 to the e.Ktremities. The omo-hyoid was even better developed, and 

 was united, at about an inch from its insertion, with the outer margin 

 of the sterno-hyoid; the trapezius\\a.di not only a clavicular insertion 

 but occupied fully one third of that bone ; although the levator 

 claviculce arose by a single head from the atlas, it soon divided into 

 two large muscles as above described. In the right forearm a 

 remarkable individual peculiarity was found : the tendon of the 

 extensor secundi internodii pollicis ended abruptly above the carpus 

 by being inserted into the interosseous ligament, and the tendon for 

 the pollex was derived from the extensor indicis, which, as in Mr. 

 Mivart's specimen, sent a tendon to the third but none to the fourth 

 digit. The small anomalous muscle described above as arising from 

 the annular Hgament near the insertion of the tendon of the flexor 

 carpi radicdis, and inserted into the terminal phalanx of the pollex 

 was not found. In the foot tlie only differences noticeable were' found 

 in the short flexor tendon for the second digit, which was not con- 

 nected by muscular fibres with the tendon of the flexor digitorum 

 hngus, and in the presence of a separate muscular slip which arose 



Proc. Zool. Soc.-— 1881, No. LIII. 53 



