. Bulletin - United States National Museum. Science. ADDITION TO POLYCHAETOUS ANNELIDS 191 This differs from other genera in that it has only one row of paleae, the place of the inner row being taken by the V-shaped ar- rangement of hooks. Genotype.—Monorchos philippinensis, new species. MONORCHOS PHILIPPINENSIS, new species Figures IS to 20. A number of individuals were collected at D 5526, between Siquijor and Bohol Islands, 9° 12' 45" N., 123° 45' 30" E., August 10, 1909,. Figs. 13 to 20, Nereis masalacbnsis Grdbe. 13, prostomium X 20; 14, third para- podicm of male X 45; 15, tent
. Bulletin - United States National Museum. Science. ADDITION TO POLYCHAETOUS ANNELIDS 191 This differs from other genera in that it has only one row of paleae, the place of the inner row being taken by the V-shaped ar- rangement of hooks. Genotype.—Monorchos philippinensis, new species. MONORCHOS PHILIPPINENSIS, new species Figures IS to 20. A number of individuals were collected at D 5526, between Siquijor and Bohol Islands, 9° 12' 45" N., 123° 45' 30" E., August 10, 1909,. Figs. 13 to 20, Nereis masalacbnsis Grdbe. 13, prostomium X 20; 14, third para- podicm of male X 45; 15, tenth parapodium of male X 45; 16, modified para- podium x 45; 17, apex of compound seta X 250. Monorchos philippinensis, new species. 18, anterior end X ; 19, thoracic setae X 45; 20, uncinus X 185. 805 fathoms, (one, the holotype, bears Cat. No. 1920 F, ). Although none retained more than the anterior regions of the body, these are so characteristically different from other genera in this family that the formation of a new genus seems necessary. The type of the species measures 25 mm. from the anterior end of the operculum to the beginning of the uncinigerous tori and has an opercular width of 6 mm. Except for the median ventral in- cision, the opercular lobes are completely fused, and their dorsal surfaces are smooth except for indistinct ridges starting from the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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