238 MR. L. N. G. RAMSAY ON 
colour, the palps and anterior part of prostomium white, as also a 
prominent nuchal band. Tentacles and tentacular cirri brownish. 
In every segment a narrow anterior white band. Posteriorly the 
notopodia increase in size and become white in colour. Dorsal 
cirri flesh-coloured.” 
This remarkable species has been fully described and figured by 
Harrington and Johnson (6, pls. iv., v.). I have here to add only a 
few further notes on the sete and some remarks on its affinities. 
As to the bristles, both specimens under consideration exhibit 
an important feature, which bas either been overlooked by other 
writers, or as is perhaps less probable, occurs only in some spe- 
cimens. This is the occurrence of a curious homogomph faleate 
type of seta in the notopodial bundle of the posterior parapodia. 
This form of seta, which is not unlike that which occurs in the 
notopodium of the posterior parapodia of WV. procera Ebl., is 
figured (text-fig. 1). In the larger of the two, which measures 
Text-figure 1. 
Homogomph falcigerous seta from notopodial bundle of 50th parapodium 
of Nereis cyclurus. X 200. 
75 mm. in length, with 107 pairs of parapodia, and has the 
characters of the peristome and parapods fully developed, these 
falcate setze appear at the 32nd parapod. They are at first two 
in number, increasing to three or four about the 50th to 70th, 
and decreasing to one or two near the posterior end. The 
spinigers of the dorsal bundle, numerous anteriorly, decrease 
steadily in number, until by the 50th there are only two or 
three and further on none at all. 
Anteriorly the lower neuropodial bundle consists entirely of 
falcigers, but about the same region as in the case of the noto- 
podial falcigers, heterogomph spinigers appear in small numbers, 
and persist to the posterior end. 
In the smaller specimen, which is about 26 mm. long with 59 
setigerous segments (it is incomplete, and lacks perhaps 20 segments 
posteriorly), the peristome is not fully developed. The distri- 
bution of the sete agrees exactly with that given above, the 
notopodial falcigers commencing about the 29th pair. 
