THE SKELETON. 



325 



Fig. 130.— The left half of the skeleton of the Common Fowl. The skull, 

 vertebral column, and sternum are bisected in the median plane. (From 

 Marshall and Hurst.) 



A, acetabulum. B, cerebral fossa. CB, cerebellar fossa. CL, clavicle. CO, 

 coracoiil. CR, cervical rib. Cl. first cervical vertebra. FE, femur. HC, hypo- 

 cleidium. HTJ, humerus. HY. hyoid. IF, ilio-sciatic foramen. IL, ilium. IS, 

 ischium. L, lacrymal bone. MC3^ metacarpal bone of third digit. MW, mandible. 

 MS, metosteon. MT, tarso- metatarsus. MTl, metatarsal bone of first digit. N, 

 nasal bone. OP, optic foramen. P, premaxilla. PB, pubes. PL, palatine bone. 

 PY, pygosfcyle. R, radius. RC, radial carpal bone. S, keel of the sternum. SC, 

 scapula. T, tlbio -tarsns. TH4, fourth thoracic vertebra. U, ulna. UC, ulnar 

 carpal bone, u ±* , uncinate process of rib. Z, infra-orbital bar. 



1, 2, 3, 4, the first, second, third, and fourth digits. 



