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Show 280 MR. CYRIL CROSSLAND ON THE [Feb. 16, (PI. XVIII. fig. 6 and text-fig. 41), the presence of this number being a peculiarity shared only by P. claparedi. In all the other species the notopodia of C are, as in P. gardineri, clavate papillae containing a single seta. Text-fig. 41. Side view of a notopodium of Phyllochatopterus aciculigerus. s=setse; »i=muscle. The neuropodia are of fair size, though much smaller than those of the gill-bearing region. Their uncini are as shown in PL XVIII. fig. 7. Although the tube is unfortunately missing, the facts of the large size of the worm and that but one specimen was collected make it almost certain that it is straight and occurs singly. Locality. Mamaduvari, South Mahlos Atoll, the Maldive Archipelago. From the reef. PHYLLOCHATOPTERUS GARDINERI, sp. n. (Plate XIX. figs. 3-7.) This species is too closely related, to P. elioti (P. Z. S. 1903, vol. i. p. 172) for a concise definition to be possible. It is readily separable, however, by its much lax-ger size. The collection contains a single complete and beautifully preserved specimen, but the tube is missing. The species is of rather larger size than the majority of this genus, measuring 2-5 mm. across the anterior body-region. The head is of the same breadth, or nearly so, as the succeeding segments, the peristomial collar being but slightly developed. The prostomium is large and bears two very distinct eye-spots (PI. XIX. fig. 3). The region A bears 15 stumpy dorsally-directed parapodia. Their seta? are like those of Chcetopterxts, but their ends, as in the other species of Phyllochcetopterus examined by me, ax-e thicker and more strongly striated. The fourth notopodium contains three strong light brown setae, the flattened shape of which (PI. XIX. fig. 4 a) recalls that of the corresponding setae in Chaetopterus. These are straight, but some of the ordinary slender setae of this parapodium are bent (PI. X I X. fig. 4 b). The majority of tlxe setae of this region are of the usual fox-m, but tlxe last segment carries some which are bent at the head as shown in fig. 4 c, PI. XIX. The first three segments of the region B are muscular even |