. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 378 COMPARATIVE ANATOMY of more or less calcified cartilages, covered by skin and muscles, which are movable upon one another and are derivatives of the fin-rays, and it is provided with a channel along the inner side. These claspers are inserted, in a closed condition, into the cloaca- of the female, and thence into the oviducts ; they are then opened out by means of special muscles, and the seminal fluid flows along their channels into the distended oviducts. In connection with this apparatus there is a gland (p. 18)
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 378 COMPARATIVE ANATOMY of more or less calcified cartilages, covered by skin and muscles, which are movable upon one another and are derivatives of the fin-rays, and it is provided with a channel along the inner side. These claspers are inserted, in a closed condition, into the cloaca- of the female, and thence into the oviducts ; they are then opened out by means of special muscles, and the seminal fluid flows along their channels into the distended oviducts. In connection with this apparatus there is a gland (p. 18) surrounded by muscular fibres, which is formed as an involution of the integument; in its histological character this calls to mind the uropygial gland of Birds (p. 21). In addition to pterygopodia, similar to those of EJasmobranchs the Holocephali possess a pair of curious anterior claspers (Fig. 301), which are protruded from a shallow pouch situated. 2a Tio. 301.—Pelvic Arch and Skeleton- of Pelvic Fin and Claspbr of a Male Ghimn'ra monstrota. (After Davidoflf.) Ventral view. , B, dorsal part of pelvic arch (iliac process); , anterior clasper ; a—/, 1—3, the various segments of the posterior clasper ; Mt, basipterygium ; Ra, JRa^, radii of fin. in front of the pelvic fins; each of these consists of a plate covered with dermal denticles, and in Callorhynchus a grooved structure is present in There is also a knob-like organ, usually known as the frontal clasper, on the upper surface of°the head. (Fig. 57). ^ These may correspond to portions of the primitive lateral fin-folds (p. 103) which are not represented in other 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, William Newton, 1857-1923. London, Macmillan
Size: 1331px × 1877px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
