f'AT/'Ar.KA. 41 



The oscular collar is thick and densely packed with spicnles. <>n tin- inside are 

 quadriradiates lying tangent ially with the basal rays downwards. and outside are 

 trixadiates. The rim, which has no fringe, is formed of tri- and quadriradiatcs. with 

 oral angles of nearly 180. There is a diaphragm in one specimen. 



Spicules (Fig. 128). 

 Oxea. There are three sorts of ( >xea : 



(a) Large projecting oxea. straight for about two-thirds of their length, then 

 bending smoothly to one side. The inner (straight) end tapers gradually 

 to a point. The outer cud is lilunt, shaped like the end of a thumb. 

 Most of the oxea are aliout the same size, 4dO p. long x '2-1 p. thick. 

 Maximum size, 640 p.~X 25 p.. There are a few smaller, imperfectly formed, 

 possibly young, oxea. 



The minute spined oxea scattered throughout the body and forming the flagellated 

 chamber skeletons are of two forms : 



(f>) Straight, refringent, thin, slightly spined, M p. X - p.. 



(<} Curved, hastate, thicker and well spined, f>0/z to (\0 p. X 2'3/i to 3' I p. 



The junction of the spear-head is marked b\- a ring of four or more large 



spines. 



The T>'>ni(liiif,-x are of one sort : 



('/) Alate triradiates from the dermal cortex and body-wall. These varv very 

 much in size and proportions. Most have the paired rays only slightly 

 shorter than the basal ray. but occasionally there is -real disparity. ISa-.-d 

 ray straight, tapering uniformly to a sharp point, 130 p. to 330 p. long x 

 8 p. to 15 p. thick. Paired rays equal, nearly straight, but slightly 

 irregular, 90 /x to 320 /u. long x 8 /A to Up. thick. Oral angle 108 to 115. 



(r) C// iiicl/in *. Basal ray straight, tapering uniformly to a sharp point. 4(!0 p. 

 to 580 p. long X 14 p. to 18/u, thick. Paired rays straight, bluntly pointed, 

 1(50 p. to 280 p. long X 1 4 /j. to H', p. thick. Oral angle K'.n . Angle of fold 

 155 to 1(')5. Apical ray nearlv straight, jxiinted. \00p. long X 1 1'// 

 thick. Set-over small. Angle bet ween apical ray and basal ray 175. 



CKISPATUS.* 

 (Plate XXVII., Fig. 2, and Plate XXXVIII.. Figs. |:;i-13fi.) 



There are four specimens of this new species in the collection, all found 

 The sixes are 9 mm. X :> mm. : C> mm. x 2 mm. ; (i mm. x 3 mm. ; 4 mm. x 2 mm. 

 They are vase-shaped, white or pale orange as prc.-crved in spirits, with a curly surface 



* CrisjHi/us, curly -haired. 



2 N 2 



