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Show 1903.] MARINE FAUNA OF ZANZIBAR. 137 M. acicidariam Webster. " Annelids of Bermuda," Bull. U.S. Nat. Museum, 25, 1884, p. 319. M.fallax Marion et Bobretsky. Ann. Sci. Nat. (6), 1875. 31. saxicola Langerhans. " Einige canarischen Anneliden," Nova Acta Acad. Caes. Carol.-Leop., 1881. M. striata Kinberg. ' Eugenies Resa,' &c. (These figures without text are of far more value than many verbose descriptions without figures.) M. corallina Ehlers. ' Die Anneliden des Magellanischen und Chilenischen Strandes.' Berlin, 1901, p. 131. (Kinberg gives figs, of head.) M. regalis Verrill. "Additions to Fauna of Bermuda," Trans. Connecticut Acad. v. pt. 2, 1900. M. januarii Grube. Sitz. der naturf. Gesell. Freunde zu Berlin, 1881, p. 111. M. parishi Baird. Journ. Linn. Soc, Zool. x. 1870. (See note also by Ehlers in U.S. Fishery Survey by s.s. ' Blake.') MARPHYSA MACINTOSHI, sp. nov. (Plate XIV. figs. 3-6.) Three specimens were obtained by digging in sand between tide-marks, on both east and west coasts of Zanzibar. The hind end is missing from all three, though the largest fragment has a length of 20 cms. Their breadth is very uniform (4 mm.), only the first half-dozen segments being rounder and narrower. There is no regular pigmentation. The prostomium is large and undivided, resembling in shape the outline of a horse's hoof. It is flat above, but deeply grooved below (PI. XIV. fig. 3). The tentacles are slender, smooth, and pointed, without differentiated basal portions. The median tentacle does not quite reach the anterior border of the prostomium, and the other two pairs, which are inserted close together at some distance on either side of it, are considerably shorter. Between the bases of the two latter can be made out with care a pair of small ill-defined eye-spots. The mandibles are curved outwards at their tips, their anterior ends marked by the lines shown in text-fig. 12, p. 138. The maxillary forceps are slender and strongly curved at their points. Great dental plates with 4 teeth on the left, 5 on the right, uppermost on both sides, are well developed. Curved laterals narrow, with 5 and 6 teeth on the left, 7 on the right. Feet normally developed, with rounded lip of seta-sac and long bunches of setae. The cirri are well developed for a member of this genus, their tips extending as far as the level of the seta-sac lip. The ventral cirrus has a thick base which almost hides the rest of the foot in a ventral view, to which is joined a smaller cylindrical tip, the whole roughly resembling a nereid palp (see fio- 4 PI. XIV.). There are three black aciculae anteriorly, at a short distance behind the beginning of the gill-region only two with an acicular ' hook' seta. This is bent and projects, and is simply bluntly pointed (PI. XIV. fig. 6). Over the greater part |
