. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 126 E. A. ANDREWS. of preservation but is based upon a special arrangement of the epi- dermis, which, Fig. 7 enlarged two hundred diameters, is a single layer of polygonal cells, close under the cuticle. This layer dips down under the groove and on the side of the groove, where seen in profile, the cells are elongated and continued as fine fibers that connect with connective tissue cells and with a membrane sepa- rating the epidermis from the large blood sinus just above it. In the figure these cells are represented in black
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 126 E. A. ANDREWS. of preservation but is based upon a special arrangement of the epi- dermis, which, Fig. 7 enlarged two hundred diameters, is a single layer of polygonal cells, close under the cuticle. This layer dips down under the groove and on the side of the groove, where seen in profile, the cells are elongated and continued as fine fibers that connect with connective tissue cells and with a membrane sepa- rating the epidermis from the large blood sinus just above it. In the figure these cells are represented in black as seen in opti- cal section and also represented as seen in surface view upon another focus. Posteriorly the epidermis had shrunken away from the cuticle, in preparation, and left a wide artificial space. In an actual cross section of this region the groove is found to be just below the posterior part of the ganglion, Fig. 8, that supplies the fifth pair of legs, so that one might argue that the annulus be- longed to the last thoracic somite while lying in the penulti- mate one. As seen in Fig. 8, which is enlarged two hundred. FIG. 8. diameters, the epidermis cells fit together as polygons only at their outer ends next the shell while their inner ends taper off as fibers which diverge right and left of the central part of the groove. The epidermal cells are thus stretched out laterally and arranged on each side with reference to the superficial median groove that is to become the sperm receptacle. Enclosing the epidermal cells is a coagulum of blood partly separated by a membrane from the blood space beneath the nerve cord. In this space lies the large median ventral artery that anterior to this section connects through the nerve cord with the. 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 Biolog
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
