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Show 142 MR. CYRIL CROSSLAND O N T H E [June 16, dorsally and only slightly convex ventrally. Posteriorly it narrows gradually to the anus, which has thick lips, is dorsally directed, and bears ventrally four cirri, two long and two very short. There is no pigmentation. The prostomium, the insertion of the tentacles, and the position of the eyes resemble their arrangement in M. simjylex, but the tentacles are much shorter (being but little longer than the prostomium) and the eyes much smaller (PL X V . fig. 13). The dental apparatus is quite of the ordinary type (see text-fig. 15). The numbers of teeth are given by the formula 5 - 5 : 5 -f-4 - 7. All are long and sharp, a character not shared by the laterals of any of the preceding species. The slender maxillae are straight proximally, bent towards each other distally. Text-fig. 14. Text-fig. 15. Text-fig. 14.-Marphysa simplex, sp. nov. Ends of lower or mandibular jaw-plates from the ventral side, X 22. Text-fig. 15.-Marphysa furcellata, sp. nov. Dorsal or inner aspect of ventral iaw-plates, X 22. The feet are normally developed, and carry bundles of seta? of moderate length. Dorsal and ventral cirri as in the preceding species and most others of the genus. Lip of seta-sac rounded in anterior feet, pointed in posterior. The seta? are as in M. simplex except the combs, which are of two kinds, both projecting very slightly. The one kind has few strong curved teeth (whence the name of the species), the other having the usual numerous minute teeth, and intermediates between these extremes are frequent (fig. 14, PL XV.). There are three or four acicula? anteriorly and one behind. The acicular seta has a simple point, is very slightly bent, and projects. The gill-region comprises the greater part of the body, continuing from the twentieth segment to near the anus. In both specimens |
