200 MB. W. PEECT SLADEN ON THE 



protrusive tips of the spinelets impart a granulose appearance to 

 the dorsal area, the whole being covered vrith a thin ileshy mem- 

 brane. The oscular orifice is small, closed by a number of sub- 

 papillate spinelets, rather longer, more prominent, and more 

 robust than those of the paxillse proper. 



Ambulacral furrows narrow and deeply sunken. Ambulacral 

 combs quite within the furrow and below the level of the test, 

 with 3 to 5 spinelets, which are short, rather robust, webbed 

 together, — the membrane being very slightly indented and with a 

 slight knob over the end of each spinelet. Ambulacral suckers 

 completely hidden by the overarching combs. 



Mouth-plates deeply sunken ; mouth-spines longer than the 

 ambulacral spines, 3 on each plate, the whole six being webbed 

 together into a continuous comb. Each plate bears one large 

 isolated secondary or superficial spine, longer than the mouth- 

 spines, very robust, covered with a thick membrane, except at the 

 tip, which is translucent and sharply pointed. 



Segmental apertures elongate and narrow ; papillae free on the 

 aboral side only. 



Actino-lateral spines very short and robust, almost hidden 

 within the furrow, of which they appear to form the sides, and 

 only protrude a short way beyond the level of the test, standing 

 nearly perpendicular to the plane of the ray, and in some parts 

 showing a tendency even to arch over the furrow slightly. This 

 disposition, together with the aborted character of the fringe, 

 imparts a feature very different from that usually presented by 

 this structure in Pteraste^ndce. In the immediate angle, near the 

 peristome, the actino-lateral spines are somewhat longer, and are 

 laid over upon the rounded surface of the interbrachial area, their 

 web being continuous and forming a smooth fleshy triangular 

 area leading up to the mouth-angle. 



Colour, in alcohol, yellowish or greyish white. 

 Station 311. Lat. 52° 50' S., long. 73° 53' W. Depth 245 

 ims. ; bottom temperature 7°*7 C. ; mud. 



Eetaster insigwis, n. sp. 



Marginal contour stellate, five-rayed. luterradial angles well 

 rounded. Minor radial proportion 44*4 per cent. ; .5=45 millim., 

 f=--20 millim. (in another example j5:r as 70:31). Eays very 

 shghtly tapering, obtusely rounded at the extremities. Dorsal 

 surface moderately convex, rays uniformly roimded from the 



