128 THE VOYAGE OF H.M.S. CHALLENGER. 



to Gervais and Alix, its tendon is inserted into the terminal plialanx of the rudimental 

 toe in Eudyptes ckrysolophus. 



12. Extensor propnus digiti medii. 



Le vimde pedieux (part of), Vicq d'Azyr, 1774, p. 516, ^o. 2. 



L'extensetir propre du medium, Cuvier, vol. L p. 393. 



Muscle No. 3, Meckel, voL vi. p. 110. 



Described by Eeid, p. 145. 



Dorsal du trcdsikme doigt, Gervais and Alix, p. 37. 



Attachments.- — This, the second dorsal interosseous muscle, arises from the upper 

 half of the anterior surface of the third metatarsal, and to a small extent from the ad- 

 joining surface of the second metatarsal bone. The muscle passes vertically downwards, 

 and is inserted into the dorsal aspect of the base of the first phalanx of the third toe. 



Action. — It extends the third toe. 



Nerve supply. — A branch from the anterior tibial nerve. 



13. Abductor digiti intemi. 



Le muscle pedieux (part of), Vicq d'Azjr, 1774, p. 51 G, Xo. 2. 



Muscle No. 5, Meckel, vol. vi. p. 110. 



Described by Eeid, p. 145. 



Dorsal du deuxihne doigt, Gervais and Alix, p. 37. 



Attachments. — This muscle arises from the upper half of the anterior surface of the 

 second metatarsal bone. It passes obliquely do'miwards and inwards, and is inserted 

 into the inner side of the base of the first phalanx of the second toe. 



Action. — It extends the toe and abducts it from the middle line of the foot. 



Nerve supply. — A branch from the anterior tibial nerve. 



14. Adductor digiti externi. 



Le muscle pedieux (part of), Vicq d'Az}T', 1774, p. 516, No. 2. 



Muscle No. 4, Meckel, vol. vi. p. 110. 



Described by Eeid, p. 145. 



Dorsal du quatrieme doigt, Gervais and Alix, p. 37. 



Attachments. — This muscle arises from the upper half of the anterior surfaces of the 

 third and fourth metatarsal bones, as weU as from the groove between them. It passes 

 vertically downwards, and its tendon, after passing between the puUey-Hke lower 

 extremities of the third and fourth metatarsal bones, is inserted into the inner side of the 

 base of the first phalanx of the fourth or outer toe. 



