510 ORIGINAL ARTICLES. 



Mr. Bridges during his residence at David, in the same country, pro- 

 cured a skeleton of a Chrysothrix, perhaps G. sciurea. 



It thus appears evident that species of Monkeys of the genera 

 Mycetes, Ateles, Cebus, Chrysothrix and Hapale are found north- 

 wards of the isthmus of Panama, and that the Ateles extends its 

 range up to the 23° N.L. 



This is all the information I have been enabled to collect con- 

 cerning the Quadrumana of the trans-panamanic province. I sin- 

 cerely trust that Mr. Salvin, who is now returning to Central America 

 in company with Mr. Godwin, for the purpose of making collections 

 in Natural History, will endeavour to render our knowledge of this 

 subject more perfect. The ignorance which prevails concerning it is 

 mainly attributable to the carelessness and negligence Naturalists 

 have hitherto shown as to the record of precise localities. 



LIII. — On the Myology or the Orang Utang (Simia Morio). 

 Ey "William Selby Church, B.A., Lee's Eeader in Anatomy, 

 Christ Church, Oxford. 



Haying had an opportunity of dissecting the muscles of an Orang 

 Utang, and of comparing them with those of the Magot {Inuus 

 Rhesus) and of the Cebus Capuchinus, I have put together the fol- 

 lowing remarks on their myology, in the hope of drawing general 

 attention to some points which have usually been overlooked. 



I shall endeavour to point out the variations existing in the 

 different species of the Quadrumana, as illustrated by the above- 

 mentioned species, and to show how much closer is the connexion 

 between the myological structure of the Platyrrhine prehensile-tailed 

 Cebus and the Magot, than that existing between the latter animal 

 and the Orang ; secondly, to furnish parallels between the recorded 

 variations of the muscular system in man and the arrangement of 

 the muscles in the Quadrumana; and thirdly, to show that the 

 Quadrumana differ among themselves in those points in which they 

 differ from man: the distribution of the Flexor Longus Hallucis 

 and Pollicis, for instance, differing as widely in the Orang, from that 

 found in the bulk of the Quadrumana, as it does from that which 

 obtains in man. 



Unfortunately, comparative anatomists have almost exclusively 

 confined their investigations to the osteology and nervous system of 

 the Bimana and Quadrumana ; and, while they have frequently noticed 

 the approach which the lower races of mankind make to the quadru- 

 manous type in those parts of their organization, few or no inquiries 

 have been made into the myology of these races, and consequently 

 the abnormal variations here mentioned are exclusively obtained from 

 civilized races. 



In many of the wild races, the external form of the limbs differs 

 slightly from that of the civilized ; and I think it may be fairly pre- 



