50 THE ANATOMY OF TERTEBRATED ANIMALS. 



arches to the hutnerus or femur, on the dorsal aspect. — In tlie 

 foi'e limb, the deltoides proceeds from tlie clavicle and sca- 

 pula to the htimeiiis. This superficial shoulder-muscle con- 

 tinues the direction of the fibres of the trapezius ; and, when 

 the clavicle is rudimentary, the adjacent portions of the two 

 muscles coalesce into a cephalo-hmneralis muscle. Beneath 

 the deltoid the supra-spinatus, on the pre-axial side of the 

 spine of the scapula ; the infya-spinatus, and the teres major 

 and minor, on its post-axial side, run from the dorsal aspect 

 of the scapula to that of the head of the humerus. 



In the hind limb, the tensor vaginae femoris, which passes 

 from that part of the ilium which corresponds with the 

 spine and acromion of the scapula, to the femur, appears to 

 answer better to the deltoid than does the glutoeus maximus, 

 which, at first sight, would seem to be the homologue of 

 that muscle. 



The iliacus, proceeding from the inner sm-face of the crest 

 of the ilium to the smaller trochanter, answers to the siipra- 

 spinatus ; the glutceus medius and minimus, which arise from 

 the outer surface of the ilium, to the infra-spinatxis and teres. 



In the fore limb, a muscle, the subscapularis, is attached 

 to the inner face of the scapula, and is inserted into the 

 humerus. No muscle exactly ctn-responding with this 

 appears to exist in the hind limb. 



On the ventral aspect in the fore limb, the coracohrachialis 

 passes from the coracoid to the humerus. In the hind limb, 

 a number of muscles proceed from the corresponding (ischio- 

 pubic) part of the pelvic arch to the femur. These are, 

 from the outer surface of the pubis, the pectineus, and the 

 great adductors of the femur ; with the obturator externus, 

 from the outer side of the ischioptibic fontaneUe, or ob- 

 turator membrane. The gemelli and the quad/ratus femoris 

 take their origin from the ischium. 



No muscle is attached to the proper inner sm-face of the 

 iliimi, so that there is no homologue of the subscapularis in 

 the hind limb. On the other hand, a muscle, the obturator 

 internus, attached to the inner surface of the ischiopubic 

 fontanelle, and winding round to the femur, has no homo- 



