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



Action. — The muscle being represented throughout by tendon is functionally useless. 



Relations. — This tendon is concealed by the alar aponeurosis, and lies partly under 

 cover of the tendon which, in the Spheniseidaj, represents the extensor communis digi- 

 torum. It is in part continuous with the external lateral ligament of the elbow joint. 



Variations. — In Eudijptes chrysocome from Kerguelen I found this tendon inserted 

 into the middle in length of the radial border of the ulnar metacarpal bone. The same 

 arrangement obtains in Aptenodytes longirostvis. 



Remarks.- — Schoepss found this tendon inserted into both radial and ulnar metacarjaal 

 bones. In figure 1 plate v. attached to Schoepss' paper, the numbers 23 (which in accord- 

 ance with the text ought to be 33) and 37, indicating the extensor carpi uluaris and 

 extensor communis digitorum respectively, ought to be reversed. 



4. Flexor metacarpi brevis. 



Le court flechisseur de I'os dii metaearpe, Vicq d'Azj-r, 1773, p. 577, No. 3. 



Flexor brevis metacarpi, Tiedemann, ja. 320, No. 6. 



Der kurze Beuger des Mittelhandknochens, Heusinger, p. 196, No. 27. 



Muscle No. 4, Meckel, vol. vi. p. 58, No. 4. 



Kurze Beuger der Mittelhand, Schoepss, p. 156, No. 36. 



Flexor carpi radialis, Selenka, vol. vi. p. 134, No. 6.5. 



Le court adducteur de la main, Gervais and Alix, p. 28. 



Attachments. — This muscle arises by means of a narrow tendon from the lower end 

 of the posterior border of the ulna, immediately above the wrist joint. The fibres pass 

 downwards, and are inserted without the intervention of tendon into the upper half of 

 the ulnar metacarpal bone. 



Action. — This muscle flexes the wrist joint. 



Relations. — It is covered by the alar aponeurosis, and rests against the outer surface 

 of the ulnar carpal bone. 



Nerve supply (?) 



Variations. — In Eudyptes chrysocome from Kerguelen this muscle is inserted into 

 the whole length of the ulnar metacarpal bone. This is also the case in Spheniscus 

 demersus. 



Remarks. — According to Gervais and Alix, this muscle in Eudyptes chrysolophus is 

 inserted into the whole length of the ulnar metacarpal bone. 



5. Adductor metacarpi. 



Der Aieine Mittelhandstrecker, Wiedemann, p. 93. 

 Elleuhogenstrecker der Mittelhand, Tiedemann, p. 319, No. 3. 

 Der Ellcnhogenbein-Mittelhandstrecker, Heusinger, p. 188, No. 24. 



