r.U.t'AHKA. 19 



SpicuIeS (Figs. 55 and 56). 

 The Oxea are of one sort : 



(n) Very large bent projecting oxea, of all .sizes from 400 M to l,830/x long, x 

 20 M to 33 M thick, pointed at both ends, usually straight for about two- 

 thirds of their length, then bent at two or three points angularly, the cud 

 being often bent through a total angle of 125 from the axis of the 

 straightcr portion of the spicule. The points where the angular bends 

 occur are often marked on the convex side by flattened areas, as if the 

 spiculc had been deflected by contact with a plane surface. 



The Triradiates are of one sort : 



(ft) Alate triradiates of very variable ,-hape. There is no distinction between 

 the gastral, body wall and dermal triradiates. Basal ray straight, tapering, 

 sharply pointed, 190 M to 360 M long x 10 /u to 14 M thick. Paired rays 

 straight or bent slightly up or down, 160 M to 220 M long x 10 M to 14 M 

 thick. Tapering slightly and rather bluntly pointed. Oral angle 110 to 

 145. 



Qufidriradiates. There is one sort of quadriiadiate : 



(c) Alate quadriradiates from the gastral cortex, basal rav straight, tapering to 

 a sharp point, 280 M long x 12 /u thick. 1'ahvd rays equal, slightly bent 



upwards, 140 to 220 M long X 10 to 12 // thick. Oral angle about 130 

 folded backwards, i.e. away from the face bearing the apical rav. An^Ie ..)' 

 fold about 170. Apical ray 40 M long X 8 to 10 ^ thick, sharply pointed, 

 bent orally. 



Oscular xj>ic/ifi-x. 



(/) The oscular fringe consists of short club-shaped oxea tapering to a point at 

 the inner end and bent near the outer end, which is rounded, l.~>0/t to 

 230 /u long X 12/t to 45/u thick. The thicker spicules arc the commoner. 

 The triradiates at the cdue have an oral angle of nearly 180. 



LKI i AM'iiA niP.r.nxA.* 

 (Plate XXXI., Kiu-. 57 58.) 



There are two specimens of this new species in the collection, one straight, vase- 

 shaped, 7 mm. x 1^ mm., the other bent through at right aii-h-. C. mm. x 1 mm. In 

 colour they are dull yellow as preserved in spirits, and appear minutely hispid to the 

 naked eye. 



The structure of the body wall, which surrounds a large gastral cavity, is shown in 



* Most of the specimens wore collected at the Discovery's ' Winter (.Huirters. 







