. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Deep-Sea Protobranciis • Sanders and Allen 245 /. Figure 5. Lateral views of a series of specimens of Prhtigloma nifens to show changes in shape with increasing size. Features of the soft-part anatomy, seen through the shell, are indicated. plates. Palps very large (with approxi- mately 17 ridges) and take up much of the lateral area of the mantle, and cover most of the lateral surface of the body/foot; i^alp proboscides, in a contracted state, short and thickened. Foot large, differing from P. nitens in that the sole
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Deep-Sea Protobranciis • Sanders and Allen 245 /. Figure 5. Lateral views of a series of specimens of Prhtigloma nifens to show changes in shape with increasing size. Features of the soft-part anatomy, seen through the shell, are indicated. plates. Palps very large (with approxi- mately 17 ridges) and take up much of the lateral area of the mantle, and cover most of the lateral surface of the body/foot; i^alp proboscides, in a contracted state, short and thickened. Foot large, differing from P. nitens in that the sole is very broad and the fringing papillae are relatively large and few in number (Fig. 8), consisting of 5-6 broad laterals, 4-5 smaller posterolat- erals on each side and 5 smaller frontal papillae; heel very large, hooked ventrally, and widely separate from foot; "byssal" gland large, from which an elongate groove extends and terminates at the center of the sole of foot. The configuration of the gut is similar to that of P. nitens, except that there are five pairs of hindgut loops closely applied to each other* (Fig. 4c). Oesophagus lacks an anterior loop above adductor muscle and the anus does not extend as far into hypobranchial space as it does in P. nitens (Fig. 8). Stomach relatively large yet sim- ple with but tvvo sorting ridges. Ganglia * It is difficult to determine both from sections and from \\hole mounts whetlier some parts of the hind gut encircle the stomach rather than form loops as in P. nitens. Ne\-ertheless, as far as can be seen there are no encircling sections, but the loops to the right and left of the body overlap in front of 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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