. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. PELVIC ARCH 111 it is perforated by nerves, and gives rise on either side to an iliac process (most marked in Holocephali) extending into the lateral walls .of the body (Fig. 88). In all the above cases we may look PP Cep upon the pelvic plate ; p^^i BP ; as essentially corres- ponding, more or less completely, with the iscMo-'puhis of higher forms. p^^_. Rad Fig. 8S.—Diagram of the Pelvis. (From the ventral side.) BP, Pelvic plate (ischio-pubis) ; I, iliac process ; PP, prepubic process ; Cep, epipubic p
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. PELVIC ARCH 111 it is perforated by nerves, and gives rise on either side to an iliac process (most marked in Holocephali) extending into the lateral walls .of the body (Fig. 88). In all the above cases we may look PP Cep upon the pelvic plate ; p^^i BP ; as essentially corres- ponding, more or less completely, with the iscMo-'puhis of higher forms. p^^_. Rad Fig. 8S.—Diagram of the Pelvis. (From the ventral side.) BP, Pelvic plate (ischio-pubis) ; I, iliac process ; PP, prepubic process ; Cep, epipubic process , Sy, region of the ischiopubic symphysis; Fo^. obturator foramen; Bas, Pro, Pad, basipterj'- gium, propterygium, and radii of the fin. Dipnoi. — The small cartilaginous pelvic plate (Fig. 89) is provided with a long and delicate an- terior median, a short posterior median, and two pairs of lateral processes. Of the latter the anterior (prepubic processes) vary much in form and length, being much longer in Protopterus than in Ceratodus, and each is embedded in an intermuscular septum; with the posterior the skeleton of the free fin is articulated by means of an intermediate piece. The anterior unpaired process must be looked upon as an epipubic process, corresponding with that of Amphibians, Rep- tiles, and Mammals (pp. 113, 115, 121). Amphibia. — Urodela. — It will be seen by a glance at Fig. 87, D, that the ventral portion of the pelvic arch of Necturus is formed on the same plan as the pelvic plate of the Dipnoi and Crossopterygii, but, as in all Urodela and Amniota, it is perforated by the obturator nerve : this indicates a further lateral extension. Like the pelvis of all Vertebrates, it has a paired origin, and in Proteus and Amphiuma this is indi- cated by the fact that its. 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 pe
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
