DR. J. MURIE ON THE ANATOMY OF THE WALRUS. 439 
not, however, pass backwards beyond the vertebral border of the scapula, but dips into 
the upper portion of the fold formed by the serratus magnus. 
What has been homologized by me as the rhomboideus capitis in the Sea-lion is also 
in the Walrus large, but it presents the following differences :—Its fibres do not reach 
beyond the posterior half of the vertebral border of the scapula, and it is inserted into 
the innermost (uppermost) half of the scapular spine. 
Dissection to show the Muscles of the Chest and the 
Vessels &c. of the Axillary and Sterno-ceryical 
Region. 
Pma, Pma*. Pectoralis major, entire on left side, and 
humeral portion reflected on right. Pmi. Pectoralis 
minor. P.c. Portion of panniculus carnosus, divided 
near the axilla. JZa.d. Latissimus dorsi. H.0. Part 
of external oblique, exposing digitations with S.img, 
serratus magnus. Sp.c. Supracostal. Sc. Scalenus. 
St.s. Sterno-scapular. Hp.S. Epi-subscapularis. Ch. 
Cephalo-humeral. St.h. Sterno-hyoid and thyroid. 
ej.v. External jugular vein. tr. Trachea. ¢.a. Carotid 
artery. pn. Pneumogastric nerve. i,j.v. Internal 
jugular vein. v.a. Vertebral artery. Sb. §: Px. Sub- 
clavian vessels and brachial plexus. 
FERDIEN 
An anterior strip of this rhomboideus capitis, but on its outer side, ‘and from 1 to 
14 inch broad, is somewhat distinct or has a furrow or cellular interspace of separa- 
tion from the apparent main muscle. Its scapular attachment is the third fourth of the 
spine, reckoning from the vertebral border ; and the slip runs on to the occiput in union 
with its neighbouring broader portion. 
