| OCR Text |
Show 1903.] MARINE FAUNA OF ZANZIBAR. 141 a lighter-coloured, bent, simply bluntly pointed acicular seta, in the posterior. The setae are thus exactly like those of M. macintoshi except in the greater size of the combs and the larger number of the aciculae. The dorsal and ventral cirri are very short, and the latter are also thick. Text-fig. 13. 3Iarphysa simplex, sp. nov. 15th foot, X 45. The gill-region extends over practically the whole body, the first thirty segments alone being without them. The gills increase rapidly in size, the largest having four or five filaments arranged comb fashion and long enough to be made nearly to meet over the back. In the smaller complete specimen gills of four filaments are found only near the beginning of the gill-region ; the remaining segments bearing gills of equal length but of three filaments or, more posteriorly, only two. MARPHYSA FURCELLATA, sp. nov. (Plate XV. figs. 13, 14.) The head and first 120 segments of one specimen were collected between tide-marks near the town of Zanzibar, and the whole of a second was dredged from 15 fathoms in Zanzibar Channel, the bottom beino- mud. The former measures 4 cms. in length and 4 m m . in breadth, the latter 12 cms. by 4 m m . in the anterior third after which the breadth decreases to 3 m m . Only the first few segments are round, the rest of the body being very flat |
