. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 16 Bulletin Museum of Comparative Zoology, Vol. 150, No. 1 A. visceral ganglion hind gut post add. mus ant. add. muscle. stomach hind gut Figure 13. Spinula hilleri. A. Semidiagrammatic view of right side of animal showing an additional hind gut coil, as well as the position of the stomach with respect to the hind gut. B. Hind gut coils as seen from the dorsal side. teriorly, and there is a well-developed 'byssal' gland. Usually there are 9 coils to the hind gut, although we have seen a few whole mounts with 8 or 10 c
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 16 Bulletin Museum of Comparative Zoology, Vol. 150, No. 1 A. visceral ganglion hind gut post add. mus ant. add. muscle. stomach hind gut Figure 13. Spinula hilleri. A. Semidiagrammatic view of right side of animal showing an additional hind gut coil, as well as the position of the stomach with respect to the hind gut. B. Hind gut coils as seen from the dorsal side. teriorly, and there is a well-developed 'byssal' gland. Usually there are 9 coils to the hind gut, although we have seen a few whole mounts with 8 or 10 coils. From dissec- tion, we believe that in those which ap- pear to have 8 coils there is a hidden coil, while the single case of 10 coils is an ex- ception to the general rule. The coils, al- though close together in S. hilleri, spread in an overlapping sequence from a point just anterior to the umbo anteriorly to the anterior adductor muscle, the outermost coil abutting the posterior edge of the muscle (Fig. 13). Probably because the hind gut takes up so much anterior space, the stomach and style sac are far posterior within the bod\ and far over on the left side. The stomach in protobranch bi- valves is normally situated on the left, but usualK' not so far to the left as in S. hilleri. The first section of the hind gut. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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