SEA LILIES, STARFISHES, ETC. — CLARK. 85 



fifth, 30 mm. ; sixth, 27 mm. ; seventh, 37 mm. ; eighth, 30 

 mm. ; and ninth, 25 mm. Radial shields distinct, well 

 separated, but in pairs ; distance between distal ends of a pair, 

 6 mm. ; width of shield at distal end, 3 mm. ; distance between 

 distal ends, across an interradius, 12 mm. Disk covered by a 

 smooth, thick skin without calcareous plates, even at margin ; 

 all over the surface, but chiefly along the radial shields, are 

 scattered minute, pimple-hke elevations, not at all crowded, 

 but where thickest there may be 7 or 8 in a space 3 mm. square; 

 large parts of the surface, especially near margin have none. 

 Oral surface covered by the same smooth, thick, non-calcified 

 skin, but with no pustules. Madreporite single, small, but 

 distinct. Genital slits only 5 mm. long, but very distinct. 

 Teeth and teeth -papillae indistinguishable, rather flat, about 

 three times as long as wide. Mouth-papillae none. First 

 tentacle pore of arm without any protecting scale ; succeeding 

 pores of basal portion of arm with two small peg-like scales ; 

 on first division of arm, there are three scales to each pore, the 

 inner one nearly a milUmeter long and .50-. 66 mm. thick, the 

 second about as long, but more slender, the outer distinctly 

 smaller in every way ; all three have rough, prickly tips when 

 dry. Distally the outer spine disaj^pears and then the second, 

 while the inner one becomes transformed into the character- 

 istic hook. The half-circles of booklets are very narrow, con- 

 sisting of only 2 series of granules ; they are incomplete on the 

 second arm-division and on the first are represented only by 

 httle patches ; on the third and distal thereto they are com- 

 plete. Colour (in alcohol) nearly uniform reddish flesh- 

 colour ; the pustules and tentacle -scales are somewhat darker. 



This species is easily distinguished from either of the other 

 species in this restricted genus by the characteristic disk- 

 covering and the tentacle-scales. It is so utterly unlike any 

 other known Australian euryalid that there is no possibility 

 of confusion with any of them. 



Loc. — East of Fhnders Island, Bass Strait, 100-300 fathoms. 

 Genus Astrothamnus, Matsumoto. 



ASTROTHAMNUS RUGOSUS,! Sp. nOV. 



(Plate XXXV., fig. 1-2.) 



Disk 20 mm. in diameter ; arms 5, approximately 140 mm. 

 long, but the tips are so closely spirally coiled, it is not possible 

 to measure them exactly. Disk covered by coarse, rounded 



1. Eugosus=TOugh. ; in reference to the rough character of the disk- 

 covering. 



