378 



ZOOLOG Y. 



well marked ; of the slits or openings between them, the 

 first is destined to form the mouth, the next pair of slits 



FIG. 379. 



FIG. 380. 



Fig 378. Hind leg of a larval Salamander. The dotted lines are drawn through 

 the rays to which the different pieces belong. Fe, femur : T, tibia ; F. tibula ; i, t, 

 c f tarsal bones; i, os intermedium; t, tibiale ; /, flbulare; c, centrale ; 1-5, the 

 five tarsals. The first row of phalanges are culled metatarsals (in the hand, mctu- 



Fig. 379. Bones of the foot of a Reptile (lizard) A, and an embryo bird. B. /, fe- 

 mur ; t, tibia ; n. fibula ; ts, upper, ti. lower pieces of the tarsus ; m, metatarsus ; 

 1- V, metatarsalia of the toes. 



Fig. 380. Leg ot the Buzzard (Biitto rulr/ariit). a, femur; b, tibia ; b', fibula; c, 

 tarso-metatarsr.s ; c', the same piece isolated, and seen from in front; dd', d", d'", 

 the four digits or toes. After Gegenbaur. 



in the Amphibia and higher Vertebrates forms the ear-pass- 

 age, while the other slits may remain open in fishes, form- 



