50 PROCEEDINGS OF THE NATIONAL MUSEUM vol.73 



and arose as follows: A ventral slip from the parapophysial plates 

 of the fourth and fifth cervicals. A slip next mediad (separated 

 from the last by a digitation from the posterior oblique division and 

 by the two scaleni) arose from the anapophyses of the fifth and sixth 

 and the parapophysis of the seventh cervical. The third slip arose 

 from the anapophyses of the fourth, fifth, and sixth cervicals. The 

 insertion of the depressor scapulae and slips of the transversalis 

 cervicis then intervened dorsad. A fourth slip arose from the 

 postzygapophyses of the fourth and fifth cervicals and a fifth slip 

 from those of the third and fourth. Between the caudal ends of 

 these two intervened a small part of the biventer cervicis. These 

 five slips then converged to an insertion, largely tendinous, upon 

 the transverse process of the atlas laterad to the inferior oblique. 

 There was no anterior oblique and it is inferred that this division 

 of the longus colli took its place. The second division was as usual, 

 connecting the centra of the cervical as well as an indeterminate 

 number of thoracic vertebrae. The third division or posterior 

 oblique arose within the thoracic cavity from the first few thoracic 

 vertebrae. It inserted by partially tendinous slips upon the para- 

 pophysial plates of the fourth, fifth, and sixth cervicals. 



In the Phoca there were but two divisions. Origins of the first, or 

 rather second, was from a number of the thoracic vertebrae (Miller 

 says seven for P. vituUna). It then passed laterad of the rectus 

 capitis anterior major and inserted by four tendinous slips upon the 

 parapophyses of the third, fourth, fifth, and sixth cervicals. Dis- 

 section of the more anterior division was unsatisfactory because of 

 caked blood, but origin was evidently from the medial part of the 

 parapophyses of the third to sixth, inclusive, cervical vertebrae. 

 Insertion of each bundle was upon the centrum of the vertebra 

 next rostrad from the fifth cervical at least to the axis and probably 

 to the atlas as well. 



There were three parts to this muscle in Arctocephalus, and but two 

 were mentioned for Phoca viPuUna, Ev/metopias, and Odobenus. In 

 all of these the divisions were relatively simple. 



M. rectus capitis anterior major (figs. 4, 5) (longus capitis) in the 

 Zalopkus arose not only from the parapophyses of the third, fourth, 

 and fifth cervicals, but from the centra of the axis and atlas as 

 well. In the Phoca it was larger and origin was from the third, 

 fourth, fifth, and sixth cervicals. Insertion in both was upon the 

 mediocranial part of the basioccipital, mediad of the rectus minor. 

 Miller's Phoca and Arctocephalus dissections agree with my Phoca. 



M. rectus capitis anterior minor (figs. 4, 5) was very small, arising 

 from the cranial base of the transverse process of the atlas. In both 

 the Zalophus and Phoca insertion was upon the latero-cranial part 



