. Text-book of embryology. Embryology. Fig. 65.—The Zoanthina larva of a ZoaDthid. (After Carlgren.). Transverse sections of Actinozoan larvae. (After van Beneden.) A, section of Zoanthina larva. B, section of Araclmactis larva, d, (in A) dorsal directive mesenteries, (in B) indefinite number of mesenteries occupying the place of the dorsal directives; (,dorso-lateral mesenteries ; dM, long dorso-lateral mesenteries ; ^, short dorso-lateral mesenteries ; V, ventral directive mesenteries ; , ventro-lateral mesenteries ; \ long ventro-lateral mesenteries ; II. (2, short ventro-latera
. Text-book of embryology. Embryology. Fig. 65.—The Zoanthina larva of a ZoaDthid. (After Carlgren.). Transverse sections of Actinozoan larvae. (After van Beneden.) A, section of Zoanthina larva. B, section of Araclmactis larva, d, (in A) dorsal directive mesenteries, (in B) indefinite number of mesenteries occupying the place of the dorsal directives; (,dorso-lateral mesenteries ; dM, long dorso-lateral mesenteries ; ^, short dorso-lateral mesenteries ; V, ventral directive mesenteries ; , ventro-lateral mesenteries ; \ long ventro-lateral mesenteries ; II. (2, short ventro-lateral mesenteries ; xx (in A) mark the places where additional pairs of mesenteries are added. in which only six mesenteries were developed. The Zoanthidae on the contrary may almost be said to pass through a Hexactinian stage in their development. We have much less information on the development of Alcyonaria than on that of Zoautharia. The best account is that of Wilson, to ' which the more recent accounts by Koch of the development of Gorgoiiia (1887), and by Hickson of the development of Alcyonium. 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: 2236px × 1118px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
