BARBADOS-ANTIGUA REPORTS 111 



that the coloration is more striking and more distinctive than 

 was suggested by the types. Each of the five specimens deserves 

 separate consideration. 



The smallest is only 7 mm. in diameter and 4 mm. high. The 

 whole abactinal surface is more or less reddish with indefinite 

 and inconspicuous blotches in the ambulacra and interambulacra. 

 The periproct, the proximal part of the oculo-genital ring and a 

 large blotch at upper end of each interambulacrum are greenish- 

 white. The abactinal spines are nearly all coral-red, but some 

 have whitish tips. 



The next specimen is 9 mm, by 5, and has a somewhat different 

 coloration, very similar to that of a third specimen, 11 mm. by 

 6.75. In these individuals, the general color abactinally is green- 

 ish-white but this is largely obliterated by the development of 

 the red blotches in both the ambulacra and interambulacra. 

 These blotches are more or less coalesced so that the median two- 

 thirds of each interambulacrum and about half of each ambu- 

 lacrum are quite reddish. The larger spines are greenish with 

 red only at the base but the small spines are often tinged with 

 red throughout. 



The specimen 17 mm. in diameter is 10 ram. high and its 

 coloration is much like that of the largest specimen but it is 

 somewhat greener, the red shades are paler, the markings are 

 less distinct and all the spines, even the actinal, have a reddish 

 tinge. 



The superb specimen from station 35 is 20 mm. in diameter 

 and 12 mm. high ; the abactinal system is not quite 6 mm. across 

 but the heavily plated peristome is 9; the primary spines are 4-5 

 mm, long. There are 14 interambulacral and 15 ambulacral 

 plates in each column. Ocular I is broadly insert but the other 

 oculars are completely excluded from contact with the periproct. 

 The test is greenish-white, nearly white abactinally, with large, 

 squarish but irregular blotches of orange-brown or rusty-red at 

 and above the ambitus. The shade varies according to moisture ; 

 it is brightest when wet. There are typically three blotches in 

 each interambulacrum but the one at ambitus is low and im- 

 perfect. There are four in each ambulacrum but the one at 

 ambitus is rather faint. In both series, the next to the lowest is 

 largest and brightest. The periproctal plates are nearly white 



