A. E. Verrill on Starfishes and Ophiurians. 131 
ginal plates 22 to each margin, the median ones smooth, con- 
vex, nearly twice as high as wide, the lateral edges straight and 
im contact; those toward the ends of the rays become rounded, 
about as broad as high, and the last four or five plates bear sin- 
gle, stout, blunt tubercles. The marginal plates are surroun 
y either one or two rows of granules. The plates of the 
lower surface are closely covered with polygonal, round-topped 
granules, smallest toward the edges of the plates; a few plates 
near the mouth bear one or two stout central tubercles; others 
have a smooth central area, perforated by one or more small 
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Similar pedicellarize of smaller size exist at the base of many — 
of the dorsal spine 
Mangular, obtuse, the last upper marginal plates larger than the 
others and more swollen. Plates of the upper surface smaller 
nd more numerous than in the p , and more coarsely 
and j arly granulated. Spines smaller, but much more 
humerous, the clusters scarcely separated covering most of 
the central part much larger than the others, in the form of small 
Tound Sibercive, No pthc re observed. Interambulacral 
