ECHINODEKMATA — CLARK. 549 



sizes and forms ; the large ones are rounded, bufc some of the 

 small ones are quite angular. The largest are at the bases of the 

 arms, but no radial shields are visible, and it is probable that the 

 large pair of plates shown at the base of one arm in the figure 

 given, are really bare spots from which the granules have been 

 rubbed ofi". Upper surface and sides of arms completely covered 

 with half-circles of hook-bearing granules, alternating with 

 much coarser, smooth granules ; there are two or three 

 series of granules in each half-circle ; the smooth ones are much 

 larger than those bearing hooks. Oral surface of disc and arms 

 covered with a rough pavement of small granules. Each jaw 

 carries at apex several sharp, flattened, tooth-like papilL^. 



Genital slits minute. First pair of arm-pores without tentacle- 

 scales, but all subsequent pores with two (three'?) small, peg-like 

 tentacle-scales, rough at the tip. Colour, uniformly light brown. 



1 specimen from Station 48. Off Wollongong, 55-56 fathoms; 

 sand and mud to rock. 



Although this species is obviously nearly related to the pre- 

 ceding, it does not seem possible to place it in the same genus, 

 the character of the disc is so different. It seems to be necessary^ 

 therefore, to institute a new genus for its reception. 



CONOCLADUS AMBLYCONUS,^! sp. nov. 



(Plate Iv.) 



Diameter of disc, 15 mm.; length of arm, about 50 mm.; width 

 of arm at base, 7 mm.; height of arm at base, 3-5 mm. Disc 

 wholly made up of five wedge-shaped divisions, each composed of 

 a pair of radial shields ; no distinct line of division between disc 

 and arm. Each wedge-shaped area carries eight — ten lai'ge,. 

 rounded tubercles, 1 — 2 mm. in diameter and rather less than that 

 in height ; the largest ones are crowded at centre of disc ; among 

 these tubercles are scattered twenty-five — thirty more or less 

 circular, bare plates, the spaces between which are filled by- 

 minute rounded granules. Arms dichotomously branched four or 

 five times, the basal, undivided portion about equalling diameter 

 of disc ; upper sui'face and sides of arms covered by tubercles, 

 plates and granules like those of the disc ; there are about four" 

 series of the large tubercles on basal portion, two above and one 

 on each side ; the latter series hardly extend bej'ond the first 

 fork, but the upper ones may be traced at least to the third fork, 

 and usually beyond. Lower surface of disc and arms covered 



**■ a/A/3Xvs = blunt + Kmvos = a cone, in reference to the blunt, conical 

 tubercles on the disc and arms. 

 I I 



