. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE VPSILOID APPARATUS OF URODELES. 263. alba. It does not show in the myotome anterior to the pubis the superficial differentiation noted in the forms already described. Neither is any of this superficial portion attached to the ypsiloid cartilage. The musculature of the Cartilage ypsiloides is otherwise quite similar to that of Dicniyctylns. The anterior ypsiloid muscle, is, owing to the great width of the linea alba, inserted into the distal portion only of the arms. The relation of the M. pubo-ischio- fcinoralis interims
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE VPSILOID APPARATUS OF URODELES. 263. alba. It does not show in the myotome anterior to the pubis the superficial differentiation noted in the forms already described. Neither is any of this superficial portion attached to the ypsiloid cartilage. The musculature of the Cartilage ypsiloides is otherwise quite similar to that of Dicniyctylns. The anterior ypsiloid muscle, is, owing to the great width of the linea alba, inserted into the distal portion only of the arms. The relation of the M. pubo-ischio- fcinoralis interims to the ypsiloid cartilage is the same as that already described in the preceding cases. 4. Desmognathus brimleyonnii, D. fuse a, Spclcrpcs ruder, S. bilinc- atits, Plethodon erythronotus, P. cincrcns.— In none of these forms is there a Cartilagoypsiloides. The musculature of the posterior ab- dominal region gives, however, decided evidence of the former ex- istence of an ypsiloid apparatus. The abdominal wall shows a more primitive musculature than Diemyctyhts, the metamerism being much more strongly marked. The rectus abdominis is broad and powerful. In the myotome (Fig. 5, r) immediately anterior to the pubis there is the same superficial differentiation that Dieinyctylns and other lunged forms exhibit. There is one difference, however, which is due to the fact that the anterior border of the pelvic girdle is deeply incurved on either side of the ventral midline so that the border presents a conspicuous median and two lateral processes (Fig. 6, / and ;;/). As a result of this the medial portion of the rectus abdominis extends much farther posteriorly than the lateral portion, since it is inserted into the ventral surface of the girdle somewhat posterior to this incurved edge. In all of the lungless forms dissected the deeper portion of the first myotome of the rectus abdominis shows a well defined though not at all strongly developed portion (Fig. 6, ,)'/<') which FIG.
Size: 1622px × 1539px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
