A treatise on zoology . Fio. 137. Sni<lii-aj<i polyspomlyla, Ag. Eiihirgdil views of, A, \citelinil rings ; 15, denticles, ,basal jilatc; c, iirojecting sjiine ; iic, cavity for uotuclionl ; v, veitebial ring. into a long whip-like end. In Honiotta the long tail is straight,and scarcely betrays its original heterocercal character (Fig. 145).The anal fin shifts far back to near the caudal; it is often verysmall, and is not present in Fig. 138. Ventral view of the pelvic girdle and lins of Chimacra monMrosfi, L., 9 ? The skeleton is coui-plotely exposed on the left side, b
A treatise on zoology . Fio. 137. Sni<lii-aj<i polyspomlyla, Ag. Eiihirgdil views of, A, \citelinil rings ; 15, denticles, ,basal jilatc; c, iirojecting sjiine ; iic, cavity for uotuclionl ; v, veitebial ring. into a long whip-like end. In Honiotta the long tail is straight,and scarcely betrays its original heterocercal character (Fig. 145).The anal fin shifts far back to near the caudal; it is often verysmall, and is not present in Fig. 138. Ventral view of the pelvic girdle and lins of Chimacra monMrosfi, L., 9 ? The skeleton is coui-plotely exposed on the left side, b, basipterygium ; dr, web of light tin with ceratotrichia ; j),pelvic cartilage ; , preaxial radials ; , postaxial {From Qi(frt. Jonni. Mia: Set.} The pectoral girdle is formed of stout cartilages fused in themiddle ventral line. They support the skeleton of the fin, Avhicliis essentially of the typical Selachian kind, with many fan-like raysattached to a metapterygium (Fig. 134). The pelvic fin has a verysimilar but smaller .skeleton (Fig. 138). The pelvic girdle, on the 174 HOLOCEPHALI other hand, differs considerably from that of the Selachian, in thatthe two halves are not fused and the iliac process is well the male an anterior claspei-, armed with denticles and lodged in ^ac.
Size: 2076px × 1203px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
