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Show 1904.] rOLYCH.ETA OF THE MALDIVE ARCniPELAGO. 273 C, 37 m m . * The size of tlxe fore body, exclusive of the parapodia, is rrearly that of C. variopedatus, viz. 15 m m . X 11 mm., while the total length of the latter species is about 115 m m . The numbers of segments composing each region are 13, 5, and 22 respectively, the thirteen segments of A bearing eleven parapodia f. The cephalic segments and their eyes and tentacles are exactly as in G. variopedatus. The parapodia differ, however, in being longer, and, as they are slender, their length is exaggerated in appearance. In C. variopedatus the 1st is the shortest and the 7th (sometimes the 6th) the longest, the 9th or last being a little longer than the 1st. In C. longimanus, on the other hand, Text-fig. 38. H.4 -3 mm,. III. 5, X 5 7 m. m. VHI. 6 7m.m. IX . 6 5 m.m. I. 5 • 5m.m. W. 3 m.m. TK.6 XL 5 mm. C. variopedatus. C. longimanus. Diagrammatic representation of lengths of parapodia of the body-region A in C. variopedatus and C. longimanus. Roman numerals are the numbers of the feet whose lengths are given in m m . The inner curved lines represent the outline of the side of the body, the outer angular lines the curves made by the tips of the parapodia. Five times the natural size, but the whole length of each parapodium is not drawn, only its excess over that of the shortest being represented by the horizontal lines. the 1st is almost as long as the longest-the 9th, the 4th being tlxe shortest and the 11th slightly shorter than the 9th. This difference between the two species may be shown graphically by the diagrams of text-fig. 38. The first parapodium is thus longer than the last, which is * I follow Joyeux-Laffuie in his definitions of the three body-regions which I designate A, B, and C as being more convenient and better than writing their names in full, and avoiding such terms as " thoracic " and " abdominal." f This is possible in an extreme variation of C. variopedatus, but it is unlikely that the only specimen found in this large collection should be such a rare abnormality. P R O C ZOOL. Soc-1904, VOL. I. No. XVIII. 18 |
