A treatise on zoology . a£ Fk;. 3S8. Transverse section of the vertebral coluniu in the trunk of a very young Trout (Salino),enlarged, , dorsal wall of air-bladder; , abdominal coeloni; bd, basidorsal cartilage ;bv, basiveritral cartilage ; c, jjosterior cardinal vein ; el, elastica externa ; /.«, fibrous sheathsurrounding notochord ; f/.r, genital ridge ; li, dorsal longitudinal ligament; , mesonepliiicduct; nx, nerve-chord ; r, rib ; d, skeletogenous tissue. A. Fk;. Caudal vertebrae of Thynnus vidparis (Cuv. and Val.)- A, right-side view ; B, left-sideview of the same cut
A treatise on zoology . a£ Fk;. 3S8. Transverse section of the vertebral coluniu in the trunk of a very young Trout (Salino),enlarged, , dorsal wall of air-bladder; , abdominal coeloni; bd, basidorsal cartilage ;bv, basiveritral cartilage ; c, jjosterior cardinal vein ; el, elastica externa ; /.«, fibrous sheathsurrounding notochord ; f/.r, genital ridge ; li, dorsal longitudinal ligament; , mesonepliiicduct; nx, nerve-chord ; r, rib ; d, skeletogenous tissue. A. Fk;. Caudal vertebrae of Thynnus vidparis (Cuv. and Val.)- A, right-side view ; B, left-sideview of the same cut in half, , anterior ventral jirocess ; «.;, anterior zjjgapopliysis : ; , haemal arch; , neural arch; , posterior ventral process ; i).2, posterior zygapophysis; r place of attachment of rib. BONE 355 structure (Figs. 340, 341). This is brought about l)y the reductionof the extreme tip of the heterocercal or homocercal fin in the laterstages of development; such a false or secondary diphycercal fin iscalled gephyrocercal (Kyder [378]). The structure of the actualupturned tip of the notochord varies greatly, being naked in EiiOi\with a cartilaginous sheath in Salmo, Elops, etc., a bony urostyle in
Size: 1730px × 1444px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
