REPORT ON THE SPHENISCID^. 123 



an additional origin from the tibia and fibula. This I failed to recognise in the 

 specimens of that bird which I examined. 



o^ 



6. Flexor perforatus et j^eiforans digiti medii. 



Le flecMsseur perfm'ant et perfare (part of), Vicq d'Azyr, 1774, p. 512, No. 4. 



Der durclibohrende und durchbohrte Beuger der Miitelzehe, Wiedemann, p. 102. 



Der Finga-schliesser, Merrem. 



Flexor perforatus et perforans digiti medii, Tiedemann, p. 344, No. 7. 



Le muscle perforant et perfore (part of), Cuvier, vol. i. p. 596. 



Muscle No. 1 (part of), Meckel, vol. vi. p. 114. 



Flexcn- perforatus (part of), Reid, p. 144. 



Flexor perforatus of the middle toe, Owen, p. 39. 



Flechisseur perfore, couche superfkielle (part of), Gervais and Alix, p. 37. 



Attachments. — This muscle, much stronger than the preceding, amses along with it 

 from the tendon of origin of the outer head of the gastrocnemius behind, while in front 

 it is attached to the posterior surface of the fibular aponeurotic origin of the peroneus 

 longus. Between these points it arises from the lower border of the outer surface of the 

 patella. The tendon of insertion of this muscle, after passing through a canal in the 

 fibro- cartilage behind the ankle joint, perforates the tendon derived from the deeper 

 portion of the flexor perforatus going to the same toe, and, dividing into two slips, 

 between which the tendon of the flexor perforans passes forwards, is inserted into the 

 base of the third phalanx of the middle toe. 



Action. — It flexes the middle toe. 



Relations. — This muscle lies between the flexor perforatus digiti interni behind, and 

 the origin of the peroneus longus in front. It rests upon the deeper portion of the 

 flexor perforatus digitorum. 



Nerve supply. — A branch of the sciatic nerve. 



Variations. — In Eudyptes chrysocome from Kerguelen, I found the tendon of this 

 muscle inserted into the base of the second phalanx of the middle toe. 



7. Peroneus longus. 



L'accessoire des flechisseurs des doigts du pied, Vicq d'Azyr, 1774, p. 510, No. 1. 



Der aussere FiisswurzelsirecJcer, "Wiedemann, p. 99. 



Der innere Beinmuskel, Merrem. 



Der liintere Schienhein-Muskel, Tiedemann, p. 337, No. 2. 



Peronier superieur, Meckel, vol. vi. pp. 107 and 117. 



Peronier moyeii, Cuvier, vol. i. p. 386. 



Described by Reid, p. 145. 



Peroneus longus, Owen, p. 40. 



Long peronier, Gervais and Alix, p. 34. . 



