io6 DISCOVERY REPORTS 



Magellan by the Alert Expedition (Monro, loc. cif., 1924). In the smaller specimen 

 from St. WS 214 they are again not apparent, but in the large fragment from St WS 770 

 two ctenidia are clearly visible on the upper surface of the feet. Stylodes are numerous, 

 there being about half a dozen in each ramus. 



The dorsal bristles are of two kinds, the one very fine, long, minutely hispid capil- 

 laries; the other stouter and with spiral whorls of small teeth. It is possible that the 

 former of these two types of bristles is only a more delicate form of the latter, but even 

 under a very high magnification I cannot see whorls of teeth. The ventral bristles are 

 typical of the genus. They are compound, with pointed, canaliculated blades. 



Remarks. This is the genotype of Kinberg's Leanira. Willey's genus Sthenolepis 

 covers those Leanira which have a median tentacle having a ceratophore and ctenidia ; 

 and Willey wishes to restrict Leanira to those species which lack the ceratophore and 

 tentacular ctenidia. It is noteworthy therefore that Kinberg's genotype probably has a 

 median ceratophore, but whether the prostomial ridge with which the median tentacle 

 is continuous is in fact a ceratophore seems to me to be not yet settled. Anyhow I agree 

 with Horst and Fauvel that Sthenolepis is unjustified. 



Genus Psammolyce, Kinberg 



Body long, vermiform. Median tentacle on anterior margin of head. No tentacular 

 ctenidia. Lateral tentacles attached to first foot. A dorsal cirrus on the 3rd chaetiger. 

 Cirriform branchiae on every foot except the first. The back and elytra coated with 

 sand-grains. Dorsal bristles slender, barbed capillaries. Ventral bristles compound 

 falcigers. 



Psammolyce semiglabra, n.sp. (Fig. i\a-g). 



Occurrence. St. 936 (New Zealand) (i). 



Description. The single anterior fragment measures 55 mm. by 7 mm. without the 

 feet for 65 chaetigers. In spirit the dorsal surface is colourless for about the first 20 

 chaetigers; behind this it is pale brown, the colour deepening from before backwards. 

 The ventral surface is a uniform pale brown except in the neighbourhood of the head. 

 The body is quadrangular in section and somewhat convex dorsally. On the ventral 

 surface there is a deep median longitudinal groove, and on the dorsal surface there is 

 also a slight median longitudinal depression which maybe an artefact. The first three 

 pairs of elytra almost meet in the median line, but over most of the body the elytra 

 cover the deep sides of the body and leave most of the dorsum bare. About the first 

 30 segments are dorsally almost free from adhesive papillae and sand-grains: further 

 back they are rather sparsely dotted over the dorsum, being most abundant in the region 

 of the apex of the elytra. They increase considerably in density from before backwards. 

 The ventral surface is covered with small, globular papillae. There are no filiform 

 papillae on the ventral surface. 



The first pair of elytra are lost: they probably concealed the head. The prostomium 

 (Fig. 14 a) is long, soft, and conical and ends in a small median tentacle, about one- 

 third as long as the head. At about its middle and on its lateral edges there are two pairs 



