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Show 286 ON THE POLYC'ILETA OF THE MALDIVE ARCHIPELAGO. [Feb. 16, EXPLANATION OF T H E PLATES. For lettering, see below. PLATE XVIII. Fig. 1. Chcetopterus longimanus (p. 272). Two of the thickened and flattened seta; of the 4th foot, showing the extreme forms met with in the same bundle. X70. 2. Uncini (a) from inner half of neuropodial torus of C ; (5) from outer half of the same ; (c) from the neuropodial torus of last foot of A. All X 350. 3. Phylloehatopterus aciculigerus (p. 278). Dorsal view of head and fore part of body. The long tentacles are lost. X 10. 4. The point of one of the acicula from the 4th foot. X 70. 5. Setae of the region A :-a & b from the 5th foot; c & d from the last. X 70. a is the normal form in the 5th foot, but dorsally are a few like b. In the last foot most are like c, others like d, and a few like a. 6. The mid-body (region B) together with adjoining segments of A & C. X 10. 7. A n uncinus from the ventral division of the fifth neuropodium of C. X 350. PXATE XIX. Fig. 1. Chatopterus longipes (p. 277). Uncini from various feet :- a & b two uncini situated near together on the first neuropodial torus of B ; c from an outer and d from an inner torus of C. X 350. 2. Strong seta; from the 4th foot of A. X 70. 3. Phyllocha:topterus gardineri (p. 280). Dorsal view of head and anterior segments. The specimen is a little contracted. X 10. 4. Various setae :-a, from the 4th foot of A ; b, a bent seta from the same ; c, from the last foot of A ; d, an uncinus from the first neuropodium of 15. a, b, & c, X 70; d, X 350. 5. Drawing of an excised segment of the region B, as seen from in front, showing parapodial gills, black gut, epithelium, &c. X 10. 6. Ventral view of three segments of mid-body, showing relative positions and sizes of the parts of the neuropodia. X 10. 7. One of the clavate notopodia of the region C as seen in optical longitudinal section. X 70. 8. Hyalincecia camiguina (p. 281). Upper jaw-plates. The darker shading represents brown chitin, the lighter calcareous matter. X 60. 9. One of the lower jaw-plates of a larger specimen. X 60. 10. Group of four kinds of setae, from a parapodium near the hind end of the worm. (The combs are often much more numerous.) 11. Group of special setae in situ from the 2nd foot. X 320. Explanation of the lettering. ece. = co?lom. d.cil.=dorsal ciliated groove. .</.=gut. gill.=triangular membranous flap between the noto- and neuropodia. #?.=glandular apparatus adjoining the gills. m.=muscle. ,- £ dorsal and ventral parts of the neuropodia. neur.v.= ) * * not.=notopodium. j9eri.=periston)]'al collar. pro.=prostomium. j3prf.+=fourth parapodium. s. = seta. £.,=second pair of tentacles. |