142 



MR. CYRIL CROSSLAND ON THE 



[June 16, 



dorsally and only slightly convex ventrally. Posteriorly it nar- 

 rows 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. simplex, but the 

 tentacles are much shorter (being but little longer than the pro- 

 stomium) and the eyes much smaller (PI. XY. fig. 13). 



The dental apparatus is quite of the ordinaiy type (see text-fig. 

 15). The numbers of teeth are giA'en by the formula 5 — 5 : 5 + 4 — 7. 

 All are long and sharp, a character not shared by the laterals of 

 any of the preceding species. The slender maxillee are straight 

 proximally, bent towards each other distally. 



Text-fia-. 14. 



Text-fia. 15. 



Text-fig. 14. — Marpliysa simplex, sp. iiov. 



from the ventral side, X 22. 

 Text-fig. 15. — Marpliysa furcellata, sp. nov 



plates, X 22. 



Ends of lower or mandibular jaw-plates 

 . Dorsal or inner aspect of ventral jaw- 



The feet are normally developed, and carry bundles of setae 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 setfe are as in M. simjylex 

 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, PI. XV.). There are three or four aciculae 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 



