ANATOMY OF BALiEN OPTEEA EOSTEATA. 
227 
side of the omohyoid muscle. The free border of this structure may be considered as 
homologous to the ligamentum bicorne or costocoracoicl membrane of other mammals*. 
Coracobrachialis, a short round muscle placed anterior to the above-described 
venous plexus ; it arose from the apex and anterior surface of the coracoid process, from 
whence it passed downwards and outwards to be inserted, by a flat tendon, into the ante- 
rior and internal part of the head of the humerus on the scapular side of the groove for 
the humeromastoid muscle. This muscle had no connexion with the capsular fibro- 
cartilage, but in Globiocephalus Svineval , in which a synovial capsule existed, it was 
inserted into the ligament, thus forming a coracocapsular muscle similar to that which 
exists in several other animals, and which has been lately described by Mr. Wood as an 
abnormal condition in Manf. 
No flexors of the fore arm were developed, but external to the coracobrachialis there 
were a few tendinous bands which appeared to be the sole representatives of this group 
of muscles, being probably the rudiments of the biceps flexor cubiti. 
The triceps was a flat irregular mass, and consisted, first, of a long head which arose 
from the inferior surface of the neck of the scapula, from whence it passed backwards 
to be inserted into the extremity of the cartilaginous condylo-olecranal apophysis ; this 
division of the muscle crossed over the teres major, forming, with it, the humerus and 
scapula, a quadrilateral space through which the circumflex artery and nerve passed, 
winding round the neck of the humerus. The second, or external head, arose tendinous 
from the middle part of the upper and posterior edge of the humerus, and passing 
towards the long head, was inserted into the upper surface of the cartilaginous process 
anterior to, but separate from, the long head ; this division of the muscle ran posterior 
to the elbow-joint. The third, internal or shortest head, arose tendinous from the pos- 
terior edge of the humerus, about 1^ inch below its head ; the fibres ran backwards and 
inwards, and were inserted into the highest or most posterior point of the cartilaginous 
olecranon, about 3 inches above the insertion of the long head; this division of the 
muscle was about 2 inches long. 
This muscle could have had but a very restricted action. In Globiocephalus Svineval 
it was represented merely by interlacing fibrous bands without a trace of muscularity. 
The rudimentary muscles of the fore arm were the following J : on the dorsal surface 
* Vascular retia or reservoirs, similar to those recorded as existing in other Cetacea, were, in the present spe- 
cimen, situated in three localities ; of these reservoirs the first and largest was placed in the thorax, and corre- 
sponded to that described by Hunter and others, hut did not, in the present instance, extend so far outwards on 
the ribs as in the Porpoise and Dolphin. The second occupied the pterygomaxillary region, and has not been 
mentioned by previous authors ; and the third, as above described, lay in the axilla. There was no plexiform 
arrangement of vessels on the abdominal surface of the depressores caudse (psoae) muscles as noticed in other 
Cetacea by Tyson, von Baer, and Breschet. 
t Eoyal Society’s Proceedings, June 1867. 
+ No muscles passing from the fore arm to the manus have been observed in any of the Toothed Whales. Their 
presence in the large Fin-whale ( Physalus antiquorum, Gray) was noticed by Mr. FiowER(Proc. Zool. Soc. Dec. 
1865), but without detailed description. 
2x2 
