1903.] MARINE FAUNA OF ZANZIBAR. 137 



M. acicidariimi Webster. " Annelids of Bermuda," Bull. U.S. 



Nat. Museum, 25, 1884, p. 319. 

 M.fallax Marion et Bobretsky. Ann. Sci. Nat. (6), 1875. 

 J/, saxicola Langerhans. " Einige canarischen Anneliden," Nova 



Acta Acad. Oa?s. Carol. -Leop., 1881. 

 M. striata Kinberg. ' Eugenies E,esa,' &c. (These figures without 



text are of far more value than many verbose desciiptions 



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 Sm-vey by s.s. ' Blake.') 



Marphysa macintoshi, sp. nov. (Plate XIV, figs. 3-6.) 



Three specimens w^ere obtained by digging in sand between 

 tide-marks, on both east and v/est coasts of Zanzibar. The hind 

 end is missing from all three, though the largest fragment has a 

 leng-th of 20 cms. Their bi-eadth is very uniform (4 mm.), only 

 the first half-dozen segments being rounder and narrower. There 

 is no regular pigmentation. 



The j)rostomium 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 dififerentiated basal portions. The median 

 tentacle does not quite reach the anterior border of the pro- 

 stomium, 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 ca.n 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, uppei'- 

 most 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 sets?. 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 chorus 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 Avhole roughly resembling a nereid palp (see 

 fig. 4, PI. XIV.). There are three black aciculse anteriorly, 

 at a short distance behind the beginning of the gill-region only 

 two, with an acicular 'hook' seta. This is bent and j)rojects, and 

 is simply bluntly pointed (PI. XIV. fig. 6). Over the greater part 



