224 ME. W. PEECT SLADEN ON THE 



cylindrical moutK-spines, slightly curved, rounded at tlie tips but 

 not tapering. 



Actino -lateral spines delicate, those included within the disk 

 being short and not reaching up to the median interradial line, 

 but leaving a rather vv^ide space. The longest spine is about the 

 fifteenth from the mouth ; but even these do not meet in the 

 arm-angle, v^here a considerable amount of thickening and de- 

 formity of the membrane occurs. The tips of the spinelets are 

 rather tapering, and not thickened or nobbed. Margin of the 

 web slightly thickened, not indented or festooned. 



Colour in alcohol, white, tinged with yellow where the mem- 

 brane is thickened in the arm-angles. Sucker-feet yellow. 



Station 300. Lat. 33° 42' S., long. 78° 18' W. Depth 1375 fms. ; 

 bottom temperature 1°'5 C. ; GloMgerina-ooze. 



Htmeitastee ineeenalis, n. sp. 



Marginal contour substellate ; interradial angles well indented 

 and somewhat angular, the lesser radius being in the proportion 

 of 43 per cent. ; JB = 28 millim., r=12 millim. approximately. 

 Eadii broad at the base, but greatly attenuated outwardly. 

 Greneral form depressed. 



Supradorsal membrane very thin. Paxillae having long pe- 

 dicels, with 8 to 10 elongate delicate spinelets. Muscular fibres 

 extremely fine and thread-like, rather numerous, radiating from 

 the tips, which are more or less prominent, suggesting the cha- 

 racter of the same structure in S. pullatus, the fibres, however, 

 being much more delicate and less numerous. Spinelets forming 

 the valves o£ the oscular orifice rather robust. 



Ambulacral furrows narrow. Ambulacral spines 2, long and 

 needle-shaped, placed slightly oblique to the line of the furrow. 

 Innermost aperture-papillse very large and comb-formed, com- 

 posed of a number of radiating shafts. Adambulacral plates 

 elongate. 



Mouth-plates with prominent and rather angular keel along line 

 of juncture, and bearing two short and moderately robust super- 

 ficial secondary mouth-spines, the anterior pair close to the adoral 

 margin. Several (three or more) mouth-spines on the margin of 

 the lateral expansions. 



Actino-lateral spines short, robust, and placed wide apart, 

 the Gth or 7th from the mouth being longest. Character 



