94 THE VOYAGE OF H.M.S. CHALLENGEE. 



represents the flexor sublimis digitorum. It passes along the inner side of the ulna, close 

 to the posterior border of that bone, and is inserted into the inner side of the base of the 

 ulnar carpal bone. 



Relations. — Covered by the alar aponeurosis this tendon rests against the inner side 

 of the ulna. It lies behind and parallel with the flexor sublimis digitorum. 



{e) Muscles inserted ixto the Metacarpal Bones. 

 1. Extensor metacarpi radialis longus. 



Le long radial, Vicq d'Azyr, 1773, p. 575, Xo. 1. 



Der hintere dussere Handspanner, MtTrem, p. 156, Xo. 1. 



Der Mittelhandstrecker, Wiedemann, p. 90. 



Extensor metacarpi radialis hngiis, Tiedemann, p. 317, No. 1. 



Extensor metacarpi radialis lomjus, Heusinger, p. 187, Xo. 22. 



Lo7ig extenseur radial, Meckel, vol. vL p. 55, Xo. 1. 



Extensor vietacarpi radialis longus, Schoepss, p. 145, Xo. 31. 



Described but not named by Eeid, p. 142. 



Extensor metacarpi radialis longus, Selenka, vol. vi. p. 130, Xo. 59. 



Le long supinateur, Gervais and Alix, p. 26. 



Attachments. — The long; radial extensor arises from the anterior or radial border 

 of the humerus, immediately above and to the outer side of the origin of the brachialis 

 interuus. The muscular fibres are short, and end on a tendon which, after passing along 

 a shallow groove on the outer surface of the radius close to the anterior free border of 

 that bone, is inserted into the upper end of the radial or anterior border of the radial 

 metacarpal bone. 



Action.- — This muscle flexes the elbow and extends the wrist joint. 



Relations. — The belly of the muscle rests against the outer side of the brachialis 

 internus. 



RemarJcs. — According to Schoepss, this muscle arises from the humerus in the 

 Penguin by two distinct heads. This arrangement I have failed to find in any species 

 which I have dissected. Meckel found the tendon of insertion of the extensor ratlialis 

 longus coalescent mth that of the tensor patagii. Such was not the case in any of my 

 specimens. According to Gervais and Alix, the tendon of insertion of this muscle is 

 united with that of the short radial extensor as they pass together over the radial carpal 

 bone. In aU of the specimens which I have dissected these two tendons are distinct from 

 end to end. 



