NO. II ECHINODERMS CLARK I 5 



are continued to the tip ; there is no felted covering, and the granules 

 are indicated only by slight elevations over which the fine striations 

 run uninterruptedly. The milled ring is low and not conspicuous ; it is 

 of the same color as the collar. 



The topmost primary spine in each interambulacrum is rudimen- 

 tary, consisting of a broadly truncated cone about as high as broad 

 at the base with strongly convergent sides and the edges of the base 

 broadly rounded. The surface is somewhat spongy, with very numer- 

 ous and very fine striations. There are 5 of these rudimentary spines 

 about the apical system. 



The oral primaries are about 4.5 mm. long with a very long collar 

 occupying about their proximal half, beyond which they are smooth 

 and more or less polished. The second is transitional to the ambital 

 spines. 



The secondary spines are slender and flattened. The scrobicu- 

 lar spines are 3 mm. long, strongly flattened, broadly truncate or 

 with the distal end more or less convex, and have parallel sides that 

 in the proximal quarter converge to the base. 



The marginal ambulacral spines are 2.5 mm. long, resembling the 

 scrobicular spines but much narrower. The miliary spines are small, 

 delicate, and sharply pointed. 



The pedicellariae resemble those of related species. Small globifer- 

 ous pedicellariae are numerous and conspicuous, large globiferous and 

 tridentate rather uncommon. 



The color is bright brownish red, the tips of the scrobicular and 

 ambulacral marginal spines sometimes showing a purplish tinge. The 

 primary spines are light at the base, becoming darker in the outer 

 two-thirds, where they may be obscurely banded or blotched with 

 lighter. When dry, the spongy covering gives them a frosted ap- 

 pearance between the granules. The collar is brownish red, some- 

 what lighter than the adjacent scrobicular spines, and the neck is of 

 the same color. The oral primaries have whitish tips. 



The test is dull creamy white, with the peristome and the inter- 

 poriferous areas of the ambulacra tinged with dull yellowish. The 

 apical system is pale brownish red, fading to whitish on the border of 

 each plate. The plates surrounding the apical system are faintly tinged 

 with greenish. 



Locality. — Galapagos Islands : Tagus Cove, Albemarle Island ; 

 from the anchor chain in 50 fathoms (91 m.) of water; July 26, 1938. 

 Six specimens (type, U.S.N.M. no. E.5604; the other five specimens 

 under U.S.N.M. nos. E.5605 and E.5606). 



