. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 2. Larvae, eighteen hours after fertilization. A. Normal larva. Side view. Shows apical tuft, prototroch, gut, and pigmented areas. 11. Normal larva. Dorsal view. Shows prototrochal gap, stomach and intestine portion of gut, and posterior cilium. (.'. Exogastrula. Post-trochal region is elongated and hollow. stomach there has developed a spherical structure, the chueta-sac, from which the long bristles later grow. Exogastrula (Fig. 1C}. Changes similar to those described for the normal larva have occurred in the apical
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 2. Larvae, eighteen hours after fertilization. A. Normal larva. Side view. Shows apical tuft, prototroch, gut, and pigmented areas. 11. Normal larva. Dorsal view. Shows prototrochal gap, stomach and intestine portion of gut, and posterior cilium. (.'. Exogastrula. Post-trochal region is elongated and hollow. stomach there has developed a spherical structure, the chueta-sac, from which the long bristles later grow. Exogastrula (Fig. 1C}. Changes similar to those described for the normal larva have occurred in the apical tuft, prototroch, and pigmen- tation of the exogastrula. The apical tuft is composed of two groups of Ion- cilia. The prototrochal gap extends over the dorsal surface. The yellow pigment has become more localized, but since the pigment was originally restricted to the more anterior part of the larva, the posterior portion is completely colorless. The difference between this larva and the normal one of the same age is, however, much more pronounced than at the preceding stage. In contrast to the fairly spherical form of the normal, it is narrow and long. It possesses no internal gut and in the posterior half there appears a large cavity. The posterior cilium is again laterally 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
