BY C. HJiDLEY AXD A. F. BASSET HULL. 273 



1 . Lepidopleurus xokfolcensis, n.sp 

 (Plate xi., figs.l,la,16,lc.) 



Shell small, elongated, low. Colour butf. 



Anterior valve ornamt'nted by i-adial and concentric rows i>f 

 small close pustules, increasing in size and spacing towards the 

 margin. 



Posterior valve: mucro prominent, central; posterior slope even; 

 clothed with close concentric rows of pustules. 



Median valves: lateral areas slightly raised, not distinctly 

 diff'ei'entiated. Tlie pustules on the central areas are inclined to 

 longitudinal arrangement, those <>n the lateral areas are more 

 transverse. 



Girdle broad, beset witli small scales and spicules, tlic latter 

 developing a marginal fringe. 



Length 6 mm., breadth 3'5 mm. 



Station. — Under loose stones at low tide. 



Habitat. — Norfolk Island. 



Remarks. — This shell is not common. Tt differs from the Aus- 

 tralian species L. badius HetUey li: Hull, in the mt)re regular 

 arrangement and larger size of the pustvdes. 



2. Lepidopleurus catenatus, n.sp. 



(Plate xi., figs. 2, 2a, -26, 2c.) 



Shell small, elongated, low. Colour cream. 



Anterior valve witli nmnerous i-ows of pustules, arranged 

 radially and connected by short links, giving the appearance of 

 concentric rings. The posterior margins raised, and more densely 

 and irregvdarly pustulose 



Posterior valve : mucro prominent, slightly behind the middle, 

 the anterior half sculptured with longitudinal rows of pustules, 

 the posterior half with radial rows. 



Median valves : lateral areas raiseil posteriorly; latero-pleural 

 areas sculptured witli 12-14 longitudinal rows of rounded pustules 

 connected each to its fellow in the neighbouring row by low, 

 slijiiit, transverse links. On the central areas the rows are 



