240 ME. W. PEECT SLADEN- ON THE 



basally, with an elongate acicular prominence in its outward 

 prolongation. Near the extremity of the ray this central shaft 

 of the papilla is greatly lengthened, being little shorter than the 

 lateral spines. 



Mouth-plates short but extraordinarily broad, the lateral flanges 

 being developed to an abnormal extent. The keel at the junction 

 is feebly represented, only flatly rounded, slightly prominent 

 aborally, adoral peak well developed. One moderately robast, 

 short, conical spinelet, very wide at the base, sharply pointed, and 

 covered with membrane, is placed near to the adoral extremity of 

 each plate and rather above the actual margin. No other secon- 

 dary surface-spine present. Mouth-si)ines 3, about equal in 

 size to the ambulacral spines, placed on the extreme outer portion 

 of the margin of the lateral flange ; and sometimes the outer one 

 is doubled. 



Actino-lateral spines delicate and well spaced, 16 on each side 

 of a ray, the third or the fourth from the mouth usually the 

 longest, the rest gradually diminishing in size as they approach 

 the extremity of the ray. 



Colour, in alcohol — dorsal surface white with the faintest shade 

 of ]Dink, actinal surface scarlet, the suckers white. 



Station 146. Lat. 46° 46' S., long. 45° 31' E. Depth 1375 fms. ; 

 bottom temperature 1°'5 0. ; Glohigerina-ooiQ. 



Htmenaster pe^coqtjis, n. sp. 



Marginal contour subpentagonal, interradial angles very feehly 

 incurved, the radii slightly attenuated at their extremity. Minor 

 radial proportion 65 per cent. ; ^=10 millim., ?'=6"5 millim. 

 The dorsal surface forms a uniform convex curve of low elevation, 

 the membrane arching over from margin to margin, and the radial 

 areas being in no way specially defined externally. No lateral 

 fringe. Actinal surface flat. 



Supradorsal membrane very fine and semitransparent. Mus- 

 cular tissue very feebly developed, no definite series of fibrous 

 bands being present, although under considerable magnification 

 the existence of aggregated fibres may be discerned. Spiracula 

 comparatively large, numerous and equally distributed, with con- 

 spicuous white ring. Paxillae large, robust, closely placed, usually 

 with five (sometimes six or seven) spinelets, which are thick and 

 widely expanded from the pedicel. The spinelets do not taper at 

 their extremities, but expand somewhat and are flaring, elevating 



