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peromarginals in the distal part of the arms are larger and more 

 projecting than the others, so as to call forth a somewhat irregu- 

 larly moniliforni appearance of the arms when seen either from 

 above or below. The superomarginal plates are produced toward 

 the abactinal side in tlie shape of a wedge, and are here 

 separated from one another by pore areas lying between them. 

 The plates are completely covered over with flattened polygonal 

 granules, which are larger and more flattened in the central part 

 of the plates and smaller, more rounded, and comparatively thicker 

 in the more peripheral parts. On some of the plates, especially 

 those nearer the tip of the arms, there are many minute granules 

 between the larger granules. The superomarginals are entirely 

 destitute of pedicellarige. 



Infer omarginals. — The inferomarginals are very distinct and 

 regular. The first two plates next the interradial line are fre- 

 quently smaller than the others, but the rest are subequal in size 

 with the exception of the last four or five at the tip of the arms. 

 The plates are nearly rectangular in form, with either a rounded 

 or wedge-shaped border towards the ventrolateral plates. The 

 granules are fiattened and polygonal, and although those in the 

 central part of a plate are larger than the more peripheral ones, 

 the difierence is not so conspicuous as on the superomarginals. Oc- 

 casionally there are one or more granules on some of the infero- 

 marginal plates, which are larger and more elevated than others ; 

 these may be looked upon as rudimentary spines. 



Adamhulacral lolates. — The adambulacral plates are small, there 

 being about two and a half or three of them corresponding to one 

 inferomarginal plate. The armature consists of two rows of spines, 

 a row of granules and a padiccllaria. The inner row consists 



