. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF THE ANNULUS VENTRALIS. 125 plate lacks any groove and henceforth remains without any spe- cial development. The female is also recognizable by the ap- pearance of the short, curved cuticular ridge on the base of the third leg, each side of the body, which is to be the me- dian edge of the future orifice of the oviduct. From this superficial ridge a cylindrical epithelial tube, the oviduct, leads into the interior of the body. The first abdominal. FIG. 5. appendages, or pleopods, are blunt papillae and apparently

- Image ID: RHPD3E
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF THE ANNULUS VENTRALIS. 125 plate lacks any groove and henceforth remains without any spe- cial development. The female is also recognizable by the ap- pearance of the short, curved cuticular ridge on the base of the third leg, each side of the body, which is to be the me- dian edge of the future orifice of the oviduct. From this superficial ridge a cylindrical epithelial tube, the oviduct, leads into the interior of the body. The first abdominal. FIG. 5. appendages, or pleopods, are blunt papillae and apparently
Library Book Collection / Alamy Stock Photo
Image ID: RHPD3E
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF THE ANNULUS VENTRALIS. 125 plate lacks any groove and henceforth remains without any spe- cial development. The female is also recognizable by the ap- pearance of the short, curved cuticular ridge on the base of the third leg, each side of the body, which is to be the me- dian edge of the future orifice of the oviduct. From this superficial ridge a cylindrical epithelial tube, the oviduct, leads into the interior of the body. The first abdominal. FIG. 5. appendages, or pleopods, are blunt papillae and apparently the same in both sexes, though sometimes in the male they seem more pointed and possibly longer. The annulus is thus a narrow transverse part of the sternum and since its posterior edge projects and overhangs somewhat it might be regarded as a sort of transverse fold. Its surface is en- tirely flat and simple as compared with the complex adult surface, Fig. i, except for the slight median depression. Looking at the shell only, Fig. 6 enlarged two hundred diameters, this depres- sion is a wide shallow groove indicated by converging wrinkles in the cuticle on each side the middle line of the animal and ex-. 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 work.. 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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