POLYCH^ETA. 287 



The general appearance of the anterior end resembles that figured by Carazzi* for 

 /'. ciliata. The ground colour is chocolate brown, and this pigment occurs upon the 

 peristomium and upon the greater part of the caruncle; the latter projects beyond 

 the front of the peristomium, terminating in two rounded lobes, divided from one 

 another by a shallow notch. The proportions of the caruncle are characteristic ; it is 

 inserted user the length of the peristomium and over the first two segments of the 

 trunk ; in the region of the first setigerous segment there is a slightly dilated pale 

 area causing an interruption of the brown pigment ; there is a patch of pigment in 

 the centre of this area which I shall call the ocular area, although I could not 

 distinguish definite eye-spots; on each side of the ocular area on the dorsum of the 

 first setigerous segment, midway between the caruncle and the margin of the body, 

 there is a very small cirrus ; at the outer margin of the same segment, on each side, 

 there is another cirriform appendage, below which occurs a capillary fascicle ; the 

 latter appendage is shown in Carazzi's figure, but not the former ; the portion of the 

 caruncle in front of the ocular area is longer than the portion behind it. The 

 remaining segments of the body carry notopodial and ueuropodial setae, the 2nd, 3rd, 

 4th and 6th segments with capillary seta? only. The notopodial setae of the 5th 

 setigerous segment are modified, consisting of an oblicpie row of eight large brown 

 acicular seta? with two not fully formed in reserve, each acicular seta being 

 accompanied by a delicate colourless spatulate seta. The acicular setae of the 5th 

 segment differ from those figured by Carazzi for P. ciliata; in P. hornetti these 

 seta? are not toothed, but a convex limbus or vane occurs below the curved apex 

 (Plate V., tig. 117). [See Mr. Arnold Watson's "Note" on p. 325 W. A. H.] 



From the 7th segment the neuropodial series of capillary setae are replaced by a 

 single row of about a dozen bidentate guarded acicular setae not differing in structure 

 from those of P. ciliata as figured by Professor McIntosh in 1868.1 The branchiae 

 also commence on the 7th setigei'ous segment, but the material is so fragmentary 

 that I cannot say where they end. The diameter of a large specimen is 1'5 millims. 

 No other dorsal setae beyond the modified seta? and their spatulate attendants were 

 observed in the 5th segment, but a bundle of very delicate neuropodial setae occurs at 

 their base. The 5th segment is firm and the fore-body porrect. The 2nd, 3rd, 4th, 

 and 6th setigerous segments carry a short cirriform notopodial ligule behind the 

 dorsal fascicle. The long peristomial tentacles are lost from most of the specimens. 



Family : CAPITELLID^E. 

 Notomastus zeylanicus, n. sp. Plate V., figs. 118 and 119. 

 Locality : East Cheval Paar, 8 fathoms. 

 Anterior fragment of small individual. The first two segments are achaetous ; the 



* D. Carazzi, " Revisione del genere Polydora, Bosc, e cenni su due specie che vivone siule ostriche," 

 ' Mitth. Zool, Stat. Neapel,' xi., 1893, see Taf. ii., fig. i. 



t See also T. Whitelegge, " Report on the Worm Disease affecting the Oysters on the Coast of New 

 South Wales," ' Rec. Austral. Mas. Sydney,' 1890, vol. i., No. 2. 



