REPOET ON THE SPHENISCID^. 105 



Muscle No. 5, Meckel, vol. vi. p. 82. 

 Described but not named, Pieid, p. 143. 

 Adductor longus, Selenka, vol. vi. p. 141, No. 81. 

 Femoro-coccygien (faisceau caudal), Gervais and Alix, p. 32. 



Attachments. — The cruro-coccygeus arises by means of a flattened tendon measuring 

 half an inch in breadth from the middle third of the external border of the last coccygeal 

 vertebra — the so-caUed ploughshare bone. It passes obliquely forwards and downwards, 

 and is inserted along with the posterior fibres of the following muscle into the posterior 

 surface of the shaft of the femur, immediately above the external condyle, and close to the 

 attachment of the upper end of the fibrous pulley through which the tendon of insertion 

 of the biceps passes. 



Action. — This muscle, acting in concert with its fellow of the opposite side, depresses 

 the tail. Taking its fixed point at the tail it extends the femur at the hip joint. 



Relations. — The muscle is concealed on the outer side by the semi-tendinosus, which 

 crosses it superficially. Its deeper surface rests against the adductor magnus. Its 

 insertion is united with the posterior fibres of the adductor longus. 



Nerve supply. — This muscle is furnished with nerves from two difi"erent sources. One 

 branch is derived from the sciatic nerve, whilst another is derived from the trunk of one 

 of the anterior coccygeal nerves. 



4. Adductor longus femoris. 



Le premier adducteur de la cuisse, Vicq d'Azyr, 1774, p. 507, No. 2. 



Der erste Anzieher dcs Olerschenkels, Wiedemann, p. 96. 



Der erste Anzieher des Oberschenkelheins, Tiedemann, p. 328, No. 6. 



L'abducfeur inferieur, Meckel, vol. vi. p. 86, No. 8. 



Triceps adductor femoris (third head of), Eeid, jj. 143. 



Adductor longus femoris, Owen, p. 35. 



Accessory femoro-ca^idal, Garrod, Proc. Zool. Soc, 1873, p. C29. 



Adductor longus (?), Selenka, vol. vi. p. 141, No. 81. 



Femoro-coccygien (faisceau iliaque), Gervais and Alix, p. 32. 



Attachments. — This muscle arises from the posterior half of the upper (dorsal) border 

 of the ischium. The muscular fibres pass obliquely forwards and downwards, and are 

 inserted into the lower half of the posterior surface of the shaft of the femur. 



Action. — It extends the femur at the hip joint. 



Relations. — The muscle is concealed at its origin by the posterior fibres of the biceps 

 cruris, and near the femur by the semi-tendinosus. At its origin it rests upon the 

 obturator externus, and at its insertion upon the adductor magnus. Its posterior fibres 

 are united at their insertion with the cruro-coccygeus. 



iVerve supply. — A branch from the sciatic nerve, which enters the deeper surface of 

 the muscle. » 



(zool. CHALL. EXP. — PART xviii. — 1883.) S 14 



