. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2l6 HAROLD HEATH. verse blood sinus (sinus transversus) with a dorsal disk-like cav- ity in contact with the ventral pericardial wall (Fig. 2). From the antero-lateral border of each of these last-named spaces a slender tube arises and passing outward plunges beneath the afferent branchial sinus and then curving backward gradually approaches the surface of the body and opens through the renal papilla. The position of the external excretory opening is, unlike that of the genital papilla, remarkably constant in position. In on
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2l6 HAROLD HEATH. verse blood sinus (sinus transversus) with a dorsal disk-like cav- ity in contact with the ventral pericardial wall (Fig. 2). From the antero-lateral border of each of these last-named spaces a slender tube arises and passing outward plunges beneath the afferent branchial sinus and then curving backward gradually approaches the surface of the body and opens through the renal papilla. The position of the external excretory opening is, unlike that of the genital papilla, remarkably constant in position. In one hundred specimens examined on this point the excretory. Fig. 2. Posterior part of kidney of C. stellcri. The ventral wall has been removed and a portion of the dorsal in order to show the transverse sinus (s) and the exit of the ureter; ba, branchial artery ; e, outer kidney opening ; g, gill; r, renal pericar- dial opening; genital opening opposite eighth gill. pores were, with a very few slight exceptions, situated opposite the last gill. Connective tissue cells laden with concrements, such as were described by Brock ('83) for several molluscs, are present in Cryptochiton in great abundance. In all specimens, but notably those above 10 cm. in length they form great accumulations in the foot and mantle in the vicinity of the mantle furrow and give the tissue the appearance of having been charged with light yel- low sand which cuts with a distinctly gritty sound. Cells of this. 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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