430 SCHULTE, SEI WHALE. 



the arches of the atlas and epistropheus and the intervening ligament, receiving a broad super- 

 ficial fasciculus from the semispinalis capitis and having some of its bundles below this con- 

 tinuous with that smaller member of the transversospinal system, which I have taken for the 

 semispinalis cervicis. The muscle has considerable thickness and inserts into the occipital 

 between the margin of the foramen magnum and the attachment of the semispinalis capitis. 

 Stannius ' in Phocccna found this muscle incorporated into the semispinalis. Murie " finds 

 two recti in Globiocephalus closely woven together. 



The rectus capitis lateralis is a short thick muscle arising from the transverse process of 

 the atlas and the adjacent border of the articular process, and inserting upon the paroccipital 

 process, its fasciculi having a slightly oblique direction and spreading out at their occipital 

 attachment. 



The obliquus capitis superior arises from the transverse process and dorsal arch of the atlas, 

 and ascends to a rather large insertion upon a ridge at the extremity of the exoccipital dorsal 

 to the insertion of the rectus capitis lateralis, and lateral to the next following muscle. 



This is a sagittal trachelo-occipital muscle, the origin of which extends from the accessory 

 process of the first thoracic vertebra to the dorsal arch of the atlas, arising from the arches of 

 the cervical vertebrae in a position corresponding to the prolongation of the line of the accessory 

 processes. Increasing greatly in size in the upper cervical region it is inserted into the occipital 

 bone between the rectus capitis posticus and the longissimus and seems to be a derivative of 

 the semispinalis capitis. It is placed dorsomesal to the dorsal divisions of the cervicle nerves. 

 This muscle is described and figured in Globiocephalu's by Murie 3 who interprets it as trachelo- 

 mastoid. He also describes, in addition to the rectus capitis lateralis, two atlanto-occipital 

 muscles, which he designates superior and inferior oblique. 



The transversarius occupies the region of the transverse processes extending from the last 

 caudal vertebra to the atlas. It is separated from the longissimus by a strong septum and is 

 itself enclosed in a sheath, of great strength in the pedicle and abdominal portion of its course, 

 but becoming tenuous in the thorax. In the pedicle the muscle is present in two divisions, one 

 dorsal to the transverse processes, one ventral, this latter being the transversarius inferior of 

 Stannius. The muscle broadens in surface view to the middle of the pedicle, then gradually 

 contracts becoming a narrow band opposite the vulva, where the inferior division is greatly 

 reduced and merges with the body of the muscle. From this point it is continued narrow but 

 of very considerable transverse depth to the last rib. In its costal portion the muscle is thinner 

 but somewhat broader giving slips from its ventral margin to each of the ribs near their angles 

 as far as the first, where it enters the interval between the scalene mass and the trachelo-mastoid, 

 and is continued as a slender fasciculus to the transverse process of the axis, being placed immedi- 

 ately dorsal to the origin of the levator scapulae. In this portion of its course it is distinct from 

 the intertransversarii dorsales and separated from them by the cervical insertions of the longis- 

 simus, having much the position and arrangement of the human intertransversarius lateralis 

 longus. The thoracic portion is considerably narrower than in Phoccena where Stannius found 

 it expanding ventrad as a thin sheet as far as the origin of the obliquus externus. Rapp 



1 Stannius, op. tit., p. 29. 



2 Murie, op. cit., p. 282. 



"' Murie, op. cit., \>. 282 and li^s. C>7, OS. 



