354 



TELEOSTEI 



FIG. 338. 



Transverse section of the vertebral column in the trunk of a very young Trout (Sulino), 

 enlarged, a.b, dorsal wall of air-bladder ; a.c, abdominal coelom ; lid, basidorsal cartilage ; 

 bv, basiventral cartilage; e, posterior cardinal vein; el, elastica externa ; /., fibrous sheath 

 surrounding notochord ; g.r, genital ridge ; li, dorsal longitudinal ligament ; m.d, niesoneplnio 

 duct ; n.c, nerve-chord ; r, rib ; d, skeletogenous tissue. 



A. 



B. 



no, 



Fio. 33t>. 



Caudal vertebrae of Thynnus vulgaris (Cuv. and Val.). A, right-side view ; B, left-side 

 view of the same cut in half, a.v, anterior ventral process ; a.z, anterior 'zygapophysis' ; o, 

 centrum; h.a t haemal arch; n.a, neural arch; p.v, posterior ventral process ; p.z, posterior 

 'zygapophysis'; r place of attachment of rib. 



