. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 22O HAROLD HEATH. pletely. Delicate branches supply the tissue of the immediate region, some going to the lateral nerve another portion to the tissue of the lateral space and it is possible that another quantity though very small may enter the adjacent regions of the mantle. Middendorff (pp. 69, 70) speaks incorrectly of two pairs of vessels which arise from the head cavity and passing in close proximity to the mantle furrow open into the sinus transver- sus (arcus arteriosus). In Cryptochiton the only vessel which. Fig. 3.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 22O HAROLD HEATH. pletely. Delicate branches supply the tissue of the immediate region, some going to the lateral nerve another portion to the tissue of the lateral space and it is possible that another quantity though very small may enter the adjacent regions of the mantle. Middendorff (pp. 69, 70) speaks incorrectly of two pairs of vessels which arise from the head cavity and passing in close proximity to the mantle furrow open into the sinus transver- sus (arcus arteriosus). In Cryptochiton the only vessel which. Fig. 3. Diagram illustrating the circulation of snout and certain vessels leaving the head cavity in C. stelleri. h, head cavity; /«, lateral nerve sinus; Is, lateral sinus; m, median proboscis protractor; mf, marginal proboscis protractor; /, pedal sinus; pn, pedal nerve sinus ; s, pallial sinus : vs, visceral cavity ; nervous system, black. holds such a position posteriorly is the lateral sinus and this as is well known has no connection whatever with the head cavity, and on the other hand the pallial artery connects with the head cavity but does not communicate with the transverse sinus. Heretofore it has been held that the sinuses surrounding the pallial cords conduct a considerable amount of blood from the head cavity into the mantle but in not less than 50 specimens of Cryptochiton injections from the head sinus failed to penetrate. 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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