Huxley does not enter into the question of the origin of the skeleton of the pelvic fin of Elasmobranchii.
The pelvic fin thus retains in all essential points its primitive arrangement.
The pelvic fin is smaller and more simply constructed than is the pectoral.
The earliest stage of the pectoral fin differs from that of the pelvic fin only in minor points.
The pelvic fin thus retains in all essential points its primitive structure.
The males are distinguished by the large claspers along the inner edge of the pelvic fin.
pelvic fin of a young male embryo of Scyllium stellare, magnified 16 diameters.
Transverse section through the pelvic fin of an embryo of Scyllium belonging to stage P, magnified 50 diameters.
pelvic fin of a very young female embryo of Scyllium stellare, magnified 16 diameters.