POLYNOIDAE ,oi 



elytra are arranged as in Hormothoe : they are large, soft and smooth except for a patch 

 of small tubercles near the umbilicus. The dorsal bristles are stout and pectinated; the 

 upper and lower ventral bristles are long and slender, with rows of teeth and very 

 delicate forked tips. The middle ventral bristles are frilled and bidentate. Bergstrom 

 saw no transitional bristles of a character intermediate between the two types in the 

 neuropods. I cannot confirm this, for at the top of the sheaf of the middle bidentate 

 bristles there are a few bristles longer and more slender than the rest of the middle 

 bristles and with very delicate bidentate tips which are transitional between the two 

 types. In the lower part of the neuropod the two types of bristle are more abruptly 

 separated. 



Eucranta villosa, Malmgren, var. notialis, var.nov. (Fig. 1 1 a~h). 



Occurrence. St. WS 788 (i). 



Varietal characters. This variety is based on an anterior fragment measuring 

 9 mm. by 4 mm. without the feet for 25 chaetigers. There is a typical harmothoid head 

 (Fig. II a) with well-developed prostomial peaks. The anterior pair of eyes are almost 

 invisible from above and lie in the middle of the prostomium underneath its lateral 

 edges. The hinder pair lie at the postero-Iateral edges of the head. The median tentacle, 

 the palps and the tentacular cirri are all about equal in length and three times as long 

 as the head. The lateral tentacles are minute and just reach to the end of the ceratophore 

 of the median tentacle. 



The elytra (Fig. 1 1 b) are fringed on their outer and hinder borders and their surface 

 is dotted not only with cilia (much more sparsely, however, than in Malmgren's figure), 

 but also with small tubercles of variable shape (Figs. 11 c-e). Towards the anterior 

 border the tubercles are smaller than over the rest of the scale. The feet are of the usual 

 harmothoid type with a well-developed notopodial bristle-bundle and a triangular 

 neuropodium. The dorsal bristles are sabre-shaped and strongly pectinated. In the 

 ventral ramus the bristles are long, delicate, slender and carry rows of spines. Only the 

 two uppermost bristles (Fig. 1 1 /) show the minutely bifid apex characteristic of the 

 genus. The following half-dozen bristles are bidentate (Fig. 11 ^), for there is a very 

 slender second tooth below the curved tip : the remainder of the bristles are unidentate 

 (Fig. 1 1 //) and are similar to those of the stem-form. The dorsal cirri are long, reaching 

 well beyond the tips of the bristles: the ventral cirri reach to the end of the foot. 



Remarks. The only substantial difference between the present southern form and 

 the northern villosa is the presence in var. notialis of the bidentate bristles intermediate 

 between the characteristic bifid bristles at the top of the ventral ramus and the uni- 

 dentate bristles which form the great majority. I have never seen an example of 

 Malmgren's species, but as far as I can gather from the accounts there is no transition 

 between the upper bifid bristles and the unidentate bristles. 



Genus Polyeunoa, Mcintosh 

 Up to 100 segments and 30 pairs of elytra. The body is elongated and vermiform. 

 The lateral tentacles are inserted ventrally. The first 15 pairs of elytra are attached to 



