. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 676. Fig, 5. Pectoral fin of Cladoselache uewberryi. )^ about | will be seen to be by no means widely different from the ventral of C. fyleri, Fig. 4: its apex is more pointed, its width is much greater and the larger number of its radials, thirty-four, demonstrates that when this element of the dermal fold was constricted otf it must have been considerably longer than in the case of the ventral: its radials, however, have the same characters as those of Fig. 4, differing little in the regions of the fin, and showing the leas
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 676. Fig, 5. Pectoral fin of Cladoselache uewberryi. )^ about | will be seen to be by no means widely different from the ventral of C. fyleri, Fig. 4: its apex is more pointed, its width is much greater and the larger number of its radials, thirty-four, demonstrates that when this element of the dermal fold was constricted otf it must have been considerably longer than in the case of the ventral: its radials, however, have the same characters as those of Fig. 4, differing little in the regions of the fin, and showing the least tendency to inter- calation: the intercalated rays, like the other radials, arise from the body wall in the hinder part of the fin, but in the mid-region of the fin they appear *) to taper away, terminating finally before the body wall is reached. In its ancestral condition this fin seems unquestion- ably to have been less acutely pointed, shorter in its distal direction, and with its radials unintercalated: from the body wall outward it may reasonably be represented in Fig. 1. Pectorals whose apices are rounded are certainly known to occur: two of these are shown in Figs. 3 and 6, C. fyleri and C. kepleri: these in some regards may be regarded as more highly specialized than the pectoral of Fig. 5: their radials are fewer in number, thirty-one, thirty-two, vary widely in size and shape in different regions of the fin, and show great unlikeness in the character of the intercalated rays. The most 1) The writer is inclined to believe that ail of these intercalated radials arise from the body wall on the other side of the fiu, the con- centration of the radials causinf;^ their proximal ends to become wedge- shaped in transverse section. Material is as yet lacking for the complete demonstration of this 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
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherjenag, bookyear1896
