BY W. J, S. McKAY. 323 



in common with the scapular portion, but it forms an arch 

 (extending from the inner condyle to the olecranon), beneath 

 which pass the inferior profunda artery and the ulnar and median 

 nerves. The musculo-spiral nerve passes between the tendon 

 above-mentioned and the rest of the humeral part of the triceps." 



Ornithop.hynchus. 

 OwKX does not describe this muscle. 



Leche refers to Coues, and mentions that Cones' description 

 differs from Meckel's. 



Coues calls the long head the rectus humeri, and describes its 

 origin from the scapula. 



From the humerus he describes an internal head, vastus internus 

 humeri, and an external head, vastus externus humeri. 



Meckel says — " Extensores antibrachii, flexibus longe fortiores, 

 maximam masste muscularis brachii partem sistunt. Ex quinque 

 revera comprnuntur capitibus, fere omnino, etiam in insertione, 

 distinctis. Horum duo infeiiores et posteriores extremo superiore 

 per linejB circiter spatium uniti, a brachii facie extensoria, hie 

 anteriore, orti, ad olecrani partem inferiorem ejusque basin ten- 

 dunt. Alter alterum ita tegit, ut ille nonnisi summse faciei 

 anterior!, hie dimidio ipsius superiori uniatur. Tertius, ante hos 

 positus, ascapulte margiueinferiore, statim ante cavum glenoideum 

 oritur et, piimo in extremo inferiore nonnihil tectus, medio 

 olecrano inseritur. Quartus, hunc statim excipiens, ex eodeni 

 margine medio oritur, ipsum tegit, et cum primo in fine infimo 

 nonnihil confluit. Quintus, ipsi vicinissimus, a scapulaj margine 

 inferiore ortns, apici olecrani inseritur." 



CuviER and Laurillard, in PL 265 (and in other plates), show 

 this muscle : T. triceps (scapnlo-olecranien), portion scapulaire ; 

 T.' idem, portion humerale externe. 



M. TRAPEZIUS. 

 EcHiDXA et Ornithorhynchus : M. trcqiezim, two parts, all authors. 



