. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. FIG. 117.—RIGHT PELVIC FIN OF Heptanckus. From the ventral side. BP, pelvic plate ; Fol, f, nerve-for- amina ; Pr, propterygium ; 1'ml, radii, which show secondary seg- mentation ; S /'«(!,, basi- or meta- pterygium. FIG. 118.—PECTORAL Fix OF Cera- todus fosteri. a, 1>, the two first segments of the main axial ray ; FS, dermal rays, shown only on one side ; f, f, lateral rays. exception of one—or at most of very few—all the rays are situated on the same side of the basalia (uniscrial type). In Rays, the propterygium of
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. FIG. 117.—RIGHT PELVIC FIN OF Heptanckus. From the ventral side. BP, pelvic plate ; Fol, f, nerve-for- amina ; Pr, propterygium ; 1'ml, radii, which show secondary seg- mentation ; S /'«(!,, basi- or meta- pterygium. FIG. 118.—PECTORAL Fix OF Cera- todus fosteri. a, 1>, the two first segments of the main axial ray ; FS, dermal rays, shown only on one side ; f, f, lateral rays. exception of one—or at most of very few—all the rays are situated on the same side of the basalia (uniscrial type). In Rays, the propterygium of the pectoral fin, and usually also the metapterygium, are strongly developed, the former extending far forwards so as to be connected with the skull by ligament, and in some cases even uniting with its fellow in front of the skull. Dipnoans.—The cartilaginous pectoral and pelvic fins are here 1 In male Elasmobranchii a number of pieces of cartilage are connected witli the distal snd of the basipterygium of the pelvic iin as a support for the copulatory organs or claspers (q. n.) : these may become more or less Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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