REPORT ON THE SPHENISCID^. 59 



Relations. — The origin of the lower portion of this muscle lies to the outer side, and in 

 contact with the slips of insertion of the extensor magnus colli. That of the upper 

 23ortion lies to the outer side, and in contact with the outer border of the lower portion of 

 the muscle. The insertion of the former lies between the origins of the splenius capitis 

 and complexus muscles. 



Nerve supply. — Branches from the posterior divisions of the cervical nerves. 



Variations. — In several specimens of different species the upper portion of the muscle 

 is inserted into the articular processes of the second and fourth cervical vertebrae. 



In Spheniscus minor and Spheniscus demersus there is no trace of the separation 

 above described of the muscle into two distinct portions, the two parts being quite 

 continuous with one another. 



7. Interspinales. 



Inter-epmeux, Meckel, voL vi. p. 8, No. 6. 



Die Zwisehendornmuskeln, Tiedemann, p. 292, No. 12. « 



Interspnales, Owen, p. 28. 



Interspinales, Selenka, vol. vi. p. 97, No. 9. 



Attachments. — The interspinous muscles are confined to the neck and tail. In the 

 neck they consist of a number of small fleshy slips, which pass between the arches and 

 spinous processes of the anterior five or six cervical vertebrae. 



Action. — These muscles extend the anterior cervical vertebrae upon one another. 



Relations. — They are concealed by the larger extensor muscles, and rest upon the cer- 

 vical vertebrae. 



Nerve supply. — Branches from the posterior divisions of the cervical spinal 

 nerves. 



Remarks. — The rectus capitis posticus minor forms, morphologically, one member of 

 this series. 



8. Intertransverse muscles. 



Die Zicisehenqweitnuskeln, Wiedemann, jj. 78. 



Die vordern unci hinfern Zioischenquermuakeln, Tiedemann, p. 291, Nos. 10 and 11. 



Intertransversaires, Cuvier, vol. i. p. 190. 



Intertransversaire du cou, Meckel, vol. vi. p. 7, Nos. 4 and 5. 



ObNquus colli, Owen, p. 26. 



Transversus colli, Selenka, vol. vi. p. 94, No. 3. 



Intertransversaires, Gervais and Alix, p. 14. 



Attachments. — The intertransverse muscles consist of a mass of muscular fibres which 

 occupy the intervals between the transverse processes of the difi"erent cervical vertebrae. 

 These fibres cannot without artificial dissection be separated into distinct bundles. At the 



