POLYCHJETA. BENHAM. 183 



Loc. Forty miles west of Kingston, South Australia, 30 

 fathoms. 



LEPIDONOTUS WILLEYI, sp. nov. 

 (Plate xxxviii., figs. 8-15.) 



? Lepidonotus carinulatus, Willey, Ceylon Pearl Oyster 

 Fisheries, part iv., Suppl. Rep., xxx., Polychteta, 

 1905, p. 248. Id., Potts, Trans. Linn. 8oc., Zool., (2), 

 xiii., 1910, p. 331. 



A single imperfect specimen which measures 9mm. by 

 4mm. over the chsetse, and only '2-5 across the body veiitrally. 

 It is imperfect posteriorly, as it contains only 19 pah's of 

 parapodia, and 10 elytrophores. The elytra are, with the 

 exception of 3 or 4 pairs, lacking. 



The specimen is a poorly preserved male. 



Under a lens the colourless elytra are covered in their 

 exposed regions by pale brown roundish tubercles of re- 

 latively large size on the lateral area, and 011 the areola, 

 which is somewhat raised. A patch of pale reddish brown 

 pigment occurs above the scar. 



The anterior concealed region is covered with much smaller 

 hemispherical tubercles (PI. xxxviii., fig. 8). The large 

 tubercles, which appear to be round under a lens, are on 

 focussing seen to be polygonal at the base, and to be produced 

 into a variable number, and variably arranged short blunt 

 processes. 



Perhaps these correspond to Willey 's " echinulate ' 

 tubercles, though the spines shown by him are sharper at 

 the point. 



Towards the external margin there occur a few rows of 

 " spinulate " tubercles, short columns of various sizes, ter- 

 minating in a variable number of sharp spines (PI. xxxviii., 

 figs. 9, 11). 



The elytra are fringed only on the external margin with 

 coarse, relatively long cylindrical processes. 



All these outgrowths of the elytra are covered by abun- 

 dance of very fine particles, which masks their details to a 

 great extent. 



The prostomium is relatively long, narrowed posteriorly, 

 with the anterior eye laterally at the greatest width, which 

 is about midway along the side ; the posterior eye is about 

 midway between this and the hinder end of the prostomiium 



