LEPUS CUNICULUS 



285 



towards the middle line. The bone is thickened in the region 

 of the glenoid facet which bears on its edge a small inwardly pro- 

 jecting coracoid process, the representative of part of the coracoid 

 portion of the girdle of the frog. The outer surface of the scapula 

 bears a prominent keel-shaped spine which increases in depth as 

 it passes to the glenoid facet. Just before reaching this it becomes 

 free from the plate and continues as a slender flattened rod, the 

 acromion, from the end of which is given off at right angles a back- 

 wardly projecting process, the metacromion. The supra-scapula 

 of the frog is represented in Lepus by a cartilaginous supra-scapular 

 border attached to the dorsal edge of the scapula. The clavicle 

 or collar bone of the rabbit is a small slender curved rod of bone 

 attached by fibrous tissue to the coracoid process at the one end 

 and to the sternum at the other. 



Pelvic Girdle. 



As in the frog, the pelvic girdle has undergone a rotation 

 from its original plane, until instead of being approximately at 



FIG. 93. A, Right scapula of Lepus, dorsal aspect; B, Left os innominatum 

 Lepus, ventral aspect. 



a., acromion ; ac. t acetabulum ; a.s., articular surface for sacrum ; c., cotyloid ; c.p., coracoid 

 process; g. t glenoid facet ; g.f., gluteal fossa ; ./., iliac fossa ; U., ilium; is., ischium ; i.t., ischia 

 tuberosity ; m., metacromion ; o.f., obturator foramen ; p., pubis ; p.s., pubic symphysis ; s., 

 spine ; s.s., supra-scapular cartilage. 



right angles to the vertebral column it comes to lie almost parallel 

 with it. The girdle is composed of two halves only feebly united 

 in the mid- ventral line ; each is roughly in the form of a P, and is 

 termed the OS innominatum. This, however, really consists of 



