. Text-book of embryology. Embryology. xvii PEOTOCHOEDATA 639 acquires a new opening into the vesicle at the front end This new opening becomes the sub-neural gland, or hypophysial tube; the other opening disappears- No protostigmata are formed; the definitive stigmata arise as small perforations of the pharyngeal wall. The intestine arises as an outgrowth from the hinder 'wall of the. Pig. 464.—Stages in the development of the bud of Distaplia magnilarva. (After Hjort.) A, lateral view of young bud in which the two atrial rudiments are still separated. B, dorsal view of young bud in which the
. Text-book of embryology. Embryology. xvii PEOTOCHOEDATA 639 acquires a new opening into the vesicle at the front end This new opening becomes the sub-neural gland, or hypophysial tube; the other opening disappears- No protostigmata are formed; the definitive stigmata arise as small perforations of the pharyngeal wall. The intestine arises as an outgrowth from the hinder 'wall of the. Pig. 464.—Stages in the development of the bud of Distaplia magnilarva. (After Hjort.) A, lateral view of young bud in which the two atrial rudiments are still separated. B, dorsal view of young bud in which the two atrial rudiments are still separated. C, dorsal view of older bud in which the atrial rudiments have united in the mid-dorsal line, , left atrial rudiment; (^ right atrial rudiment; ep, epicardial tubes; int^ rudiment of intestine; , nerve tube—rudiment of adult ganglion ;' ov, ovary; jsTt, pharynx. pharynx; the pericardium as a median evagination of the ventral wall of the same organ. The muscles and the genital organs arise from the mesodermal cells (Fig. 464). In Pyrosoma, Salpa, and Doliolum, the stolon arises in just the same manner as in Clavelina. In Pyrosoma, as we have already. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
Size: 1254px × 1993px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
