b'.b. ph.b. 



Plate XIX.— Parts of the skeleton of the dogfish. 



A, The skull, from above; £, the same, from below; C, skeleton of 

 visceral arches, not including the labial or extrabrancbial cartilages ; 

 D, section of a trunk vertebra ; E y section of a tail vertebra. 



a.v. } Opening of tube from inner ear; b.b. t l>,/t., cer.b., cer.k., e.c.f., 

 gr. t hymd.) M.c. n.a. t n.sp., ttas.c, orb. y oi'. } j>al.b., p/t.b., rosi., 

 tr.y as in Fig. 348 ; car.g., groove for carotid artery ; j.m. t foramen 

 magnum \Jont., fontanelle ; //.<&., hypobranchial cartilage; hae.c. t 

 haemal canal ; hymj. % facet for hyomandibular cartilage ; i.e./., 

 foramen for internal carotidarteries; m.e. } mesethmoid cartilage; 

 hi- h., notochord ; o.c, occipital condyles; settle, semicircular 

 canals; vcr.c, vertebral foramen. 



