22 DESCRIPTIONS OF PREPARATIONS. 



qui semblerait prouver qu'ils est une des conditions de la station quadrupede.' This would 

 apply more correctly to the prolongation of the muscles, g, h> i, on to the scapula, as shown on 

 the left side at/. 



ri. Metacromial insertions of acromio-basilar and trapezius. 



o. Anterior or cervical portion of serratus magnus of left side, exposed by the removal of the three 

 last-named muscles. A muscular fascicle, which not rarely arises between the upper part of the 

 origin, here seen, of the serratus and those of the scaleni, is not shown in this figure. It is a long 

 and slender slip, and passes down vertically to join the thoracic portion of the serratus, and to be 

 inserted with it into the posterior and inferior angles of .the scapula, and appears, when com- 

 pared with the omohyoid of the horse, to represent that muscle. 



/. Sterno-hyoid muscle, arising from sternum and cartilage of first rib. 



q. Sterno-thyroid, fused posteriorly with dorsal surface of preceding muscle. 



r. Thyro-hyoid. 



s. Stylo- hyoid, with its tendon running along the thyro-hyal portion of the hyoid arch at an oblique 

 angle to its muscular belly. Within this angle lies the ninth nerve. The trunks and branches 

 of the pneumogastric and sympathetic nerves, as also of the carotid artery, have been removed 

 from the triangular space bounded by the sterno- and thyro-hyoids mesially, by the stern o- 

 mastoid externally, and by the muscular part of the stylo-hyoid superiorly, and in the space thus 

 bounded we see the upper part of the cleido-mastoid muscle, m, externally, and a part of the 

 rectus capitis anticus major internally passing up to take origin in company with each other from 

 the basi-occipital. 



/. Body of hyoid bone ; the longer cornu, or thyro-hyal, passes backwards in connection with the 

 tendon of the stylo-hyoid, the anterior corau and arch are concealed from view. 



. Digastric muscle, here represented by a single muscular belly, placed anteriorly and inserted into 

 the symphysis of the lower jaw, and by a tendon taking origin from the paroccipital process and 

 representing the posterior muscular belly of anthropotomy and the single muscular belly of the 

 Carnivora. 



v. Mylo-hyoid muscle. 



w. Depressores labii inferioris. 



x. Insertion of platysma myoides into lower jaw on left side below buccinator, anteriorly to masseter 

 muscle. 



x'. Fibres passing off from this cutaneous muscle to end in the moveable tissues round the mouth. 



x". Insertion of platysma myoides into lower jaw of right side cut short. 



x'" . Insertion of platysma myoides into manubrium sterni. 



x"". Delamination of platysma myoides into two layers. 



y. Buccinator muscle. 



y. Masseter muscle, with much less obliquity in its fibres than is usual in Rodents, as necessitated by 

 the relations of the mandible and malar arch. It consists here of two strata as in the Horse, but 

 has of course no antorbital factor as have so many Myomorphous and Hystricomorphous Rodents. 

 It is bounded anteriorly by a stout tendinous band, which prevents the lower jaw to which it is 

 affixed below from being separated beyond a certain distance from the jugal arch, to the freely 

 projecting anterior angle of which it is affixed above. The mobile bifid lip compensates some- 

 what for this restriction on the opening of the jaws. 



z. Internal pterygoid muscle. 



(a). Submaxillary gland and duct. 



(a'). Submaxillary gland of left side, covered by deep cervical fascia. 



(j8). Deep cervical fascia, forming sheaths for the muscles and capsules for the glandular structures in 

 this region. A circular bulging indicates the area where it is underlaid by the Submaxillary gland. 



(7). Latissimus dorsi of right side, passing beyond the tendons of the great pectoral and the ' dermo- 

 humerien ' cutaneous muscle to be inserted, together with the teres major, and underneath the 

 tendon of the coracpbrachialis, upon a well-marked facet below the inner tuberosity of the 

 humerus. 



(8). Tendon of ' dermo-humerien ' muscle displaced outwards so as to leave a half-moon shaped 

 space between it and the tendon of the latissimus dorsi. The ' dermo-humerien ' muscle joins 

 the posterior part of the pectoralis major, c, and first gains a fixed attachment to the pectoro- 

 deltoid ridge, and then, by arching over the biceps, to the inner tuberosity of the humerus. 



(e). 'Latissimo-condyloideus' muscle, passing down from the tendon of the latissimus dorsi to be 



