278 MR. CYllIL CKOSSLAXD ON THE [Feb. 16, 



long (up to 2*5 mm. anteriorly), narrow at their bases, and broad 

 distall3^ In coiTespondence with this the outer division of the 

 neuropodium is found on the body- wall, not on the basal part of 

 the notopodium as in the other species (text-fig. 40, p. 277). The 

 neuropodial cirri of G. variopedatus &tg not present in C. longipes. 

 The notopodia project vertically upwards, each in contact with 

 its fellow above the back, giving this region of the body a stiiking 

 appearance. The first six ai-e long, but posteriorly they become 

 short and directed in a line with the axis of the body. The ventral 

 halves of the neuropodia are as usual. 



The setae of A resemble closely those of C. variopedatus, bvit 

 are fewer and stouter in proportion. Each notopodium contains 

 about 20, as against 60 in C. variopedatits. Their variations in 

 shape and stoutness, in correspondence with their positions, are 

 also as in this latter species. The nine ventral setas of the fourth 

 notopodium of A are broadened, but remain of a light bi-o.wn 

 colour. Their ends are of the usual shape, but they are all moi'e 

 strongly striated and roughened than are those of G. variopedattis 

 or even of G. longimanus, in spite of their very much smaller size 

 (PI. XIX. fig. 2). 



For the description of the uncini I refer to the table given 

 (p. 276) and to the figure 1, PI. XIX., and its explanation. 



Phylloch^topterus aciculigbrus, sp. n. (PI. XYIII, figs. 3-7.) 



Definition. — Of large size. Gill-region of ttvo {or three) segments 

 only. With eight strong setce in 4:th foot, and numerous slender 

 setce in the conical notopodia of the third hody-region. 



Glosely allied to P. major Gkq). 



The species is of large size for a member of this genus, being 

 7 mm. bi'oad. The greater pai't of the hind body is unfortunately 

 missing. It is thus, at any I'ate, as lai'ge as, if not larger than, 

 P. major Clap. 



The head is, as usual in Ch^etopterids, mainly formed by the 

 peristomium, besides which the jwostomiuni, though distinct, is 

 insignificant. Fig. 3, PL XVIIl., gives its shape and relation- 

 ships. I do not find eye-spots developed. The peristomial collar 

 is well developed, though low on the dorsal side, and the second 

 smaller pair of tentacles are seen to be continuous with it. The 

 long tentacles are lost. In all Phyllochaetopterids they are very 

 readily thrown off, and special precautions are necessary to ensui-e 

 their preservation. 



The regio7i A is 11 millimetres long by 7 broad, including the 

 parapodia., of which there are nine pairs. They are longer and 

 more tapering than in the other species, more like those of the 

 same region in Ghcetopterus. The fourth notopodium contains 

 eight thickened setae of a bi-own coloui-, proximall}' strongly striated 

 but without other markings. This number is very I'emarkable, 

 P. gracilis being the only species formerly known which pos- 

 sesses more than one. Xo other species has more than three, or, 



