700 



THKTIS SCIENTIFIC RESULTS. 



The innermost ossicle is near the interradial line, about 5 mm. 



from its fellow of the adjacent ray. Second ossicle 12-20 mm. 



from the first, and about same distance from the third. The 



third ossicle about 30 mm. from the large plate at tip. Each 



ossicle is circular, and convex, tiie first and second about 4 mm. 



in diameter, the third about 3 mm. Each is encircled by a row 



of bead-like granules. Large plate at end of ray nearly circular 



(8 mm. across) tumid, and encircled by a ring of small oblong 



granules. Infermarginal plates 9 to 10 ; separated (at base of 



ray) from supermarginals by about 8 mm. of test, covered with 



tubercles, and granules. The five innermost ossicles generally 



bear a large tubercle on their upper edge, while the eighth to the 



tenth bear on the lower surface a conical ossicle. Each infero- 



marginal ossicle is encircled by a row of small, irregular granules. 



The last three plates are wedged in between the large terminal 



supermarginal and adambulacral plates. Actinal area paved 



with fairly regular rows of rounded, acorn-shaped tubercles. 



Each tubercle surrounded by a row of large, irregular granules. 



Adambulacral armature composed of: (1) a furrow series of four 



(towards extremity of ray three) subcylindrical, blunt-pointed, 



spines, subequal except the adoral, which is smaller. (2) On 



the actinal surface of the plate a transverse series of two (towards 



extremity of ray one) stout, four-sided spines. The outer spine 



smaller, and often three-sided. On inner side of each armature 



are three or four irregular granules (fig. 



124). Mouth plates with a furrow series 



of seven or eight spines, similar to 



tho.se of the adambulacrals, except the 



inner one, which is stouter. A row of 



four large, blunt spines on the actinal 



surface, parallel with the furrow series, 



theadoral onesmaller. Pincer-shapedpedi- 



cellarias (fig. 125) occur on both series of 



marginal plates, and are plentiful on the actinal 



interradial areas. One is rarely found on the 



adoral side of an adambulacral plate, between 



the two spines. They are also not uncommon on 



the dorsal surface. Madreporite conspicuous, 



situated about one-third distance from centre 



to the margin, on the interradial line. Stria- 



tions convoluted. Anus subcentral, surrounded 



by seven large, pear-shaped granules. Colour 



in alcohol, light chocolate. 



Obs. A larger specimen (R=130 mm.), collected 

 Fisheries Investigation Vessel " Endeavor," has tlie 





Fig. 124. 



by the 

 larger 



tubercles of the dorsal surface flat-topped. Also six of the super- 



