42 " ENDEAVOUR " SCIENTIFIC RESULTS. 



Superomarginal plates nearly or quite vertical in position,, 

 and hence scarcely to be seen from above, 30-32 in number, 

 the interradial ones much higher than long, covered with 

 granules similar to those on the abactinal plates ; there are 

 about 200 granules on one of the big interradial supero- 

 marginals. Terminal plate small, nearly circular, consider- 

 ably swollen. Inferomarginals very similar to supero- 

 marginals in number, position, size and form ; they have the 

 same granular covering. In the holotype and in some other 

 specimens intermarginal plates of irregular size, shape and 

 position occur in considerable numbers, but this is not a 

 constant feature, since in some individuals such plates appear 

 to be rare if not altogether wanting. Ac tino lateral plates in 

 about 7 series ; the jfirst, adjoining the adambulacrals, extends 

 nearly or quite to the arm-tip, the second goes about the 

 three-fourths of the way, and the third more than half ; all 

 the actinolateral plates are covered by granules distinctly 

 coarser than those on the abactinal surface. 



Adambulacral plates about 60, longer than wide, with a 

 fairly straight margin ; on this margin is a series of 4 sub- 

 equal, squarish, blunt spines, about 2 mm. long (occasionally 

 a fifth, adoral, much smaller spine occurs) ; outside this 

 series is a second, consisting of 3 or 4 shorter, but thicker 

 spines, and external to these is a series of 4 much smaller 





Fig. 4.x 10. 



spines or angular granules, which do not much exceed the- 

 granules on the actinal plates. Oral plates not conspicuous, 

 or pecuhar ; even the oral spines are not strikingly larger 

 than those on the adjoining adambulacrals. No pedicel- 

 larise were detected anywhere. 



