Chap. VIII.] 



THE SKELETON. 



173 



ischii, isc. b. the ischial border, s. il. b. the supra-iliac border, 

 pu. b. the pubic border, ac. the acetabulum, ac. b. the acetabular 

 border, and ob. f. the obturator foramen. 



r.ac.il. 



A. 



3- pu. 



pa. 



FIG. 56. HIP-GIRDLE. 



A. Innominate bones and sacrum of fowl. B. Innominate of rabbit. C. In 

 nominate of frog, from above. D. The same from the side. 



ac. Acetabulum. ac. &. Acetabular border, a. t. Anti-trochanter. ca. v. 

 Caudal vertebras, il. Ilium, i. s. f. Ilio-sacral foramen, isc. Ischium. 

 isc. 6. Ischial border. 06. /. Obturator foramen in rabbit, obturator fissure 

 in fowl. p. p. Pectineal process, pu. Pubes. pu. 6. Pubic border, pr. ac. il. 

 Pre-acetabular part of ilium, pt. ac. il. Post-acetabular part. py. Pygostyle. 

 s. il. &. Supra-iliac border. sy. Symphysis. t. isc. Tuber ischii. v. Last 

 thoracic vertebra. 



In the adult fowl the ilium, ischium, and pubes, not only fuse 

 into a single innominate (56, A.), but this becomes ankylosed with 

 the compound sacrum. On the other hand, there is no symphy- 

 sis as in the frog and the rabbit. The student should endeavour 

 to obtain a just-hatched chick or a nestling pigeon, in which the 

 bones are still separate. In Fig. 56, A., pr. ac. il. is the pre- 

 acetabular part of the ilium, pt. ac. il. the post-acetabular part, 

 ca. v. the caudal vertebrae, pij. the pygostyle, isc. the ischial 

 portion, pu. the pubis, ob. f. the obturator fissure, i. s. f. the ilio- 

 sciatic foramen, a. t. the anti-trochanter, ac. the acetabulum, p. p. 

 the pectineal process, perhaps derived from an acetabular, and 

 v. the last thoracic vertebra. 



