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clegi'ee, by which means tlie sntiu'al divisions of the ssgments are clearly 

 marked out, and a somewhat auuulated appearanca is given to the ray. The 

 terminal plate is large and conspicuous, appearing somewhat tubercular and 

 directed slightly upwards when viewed in profile, and oval in contom* when 

 seen from above. This plate bears three short and rather robust s^jinelets — 

 one at the terminal extremity of the plate, situated in the median dorsal line, 

 pointing in the direction of the prolongation of the ray, and diverging but 

 little from the horizontal. Below this spine, and at either side of it, at the 

 angle formed by the ventral edge of the plate and the external extremity, is 

 a somewhat smaller s^nnelet, joointing in the direction of the prolongation of 

 the veuti-al margin of the plate. Cribiform organs 7 in number, narrow and 

 well defined ; structm'e papilliform. 



" Ambulacral fmTOWs narrow and straight, almost completely closed-in 

 by the over-arching adambulacral plates and spines, the sucker-feet, which 

 are arranged in simple pairs, being entirely concealed from view. The 

 adambulacral plates are about half as broad as long, but diminish in size as 

 they j)roceed outwards ; and form along the ray triangular prominences pro- 

 jecting into the f m-row. Each plate bears 3 to 4 spines, rather short, rapidly 

 pointed, more or less compressed, invested w^ith membrane, an-anged in line 

 along the fm-row-margin of the plate and sometimes slightly oblique to the 

 com-se of the furrow. The row of spinelets can be raised at a right angle 

 to the sm-face of the plate, so as to allow the sucker-feet to be protruded. 

 Ti-aces of an aborted secondary or external spinölet, represented by a mere 

 granule, may be detected at the adorai extremity of the adambulacral plate, 

 away from the fmTow-series. 



" Mouth- plates moderately large, the inner margins which fall in the 

 median sutm-e being elevated so as to form a rounded elongate tubercular 

 protuberance, the lateral margins being flattened out. Mouth-spines 7 or 8 

 on each side, similar to the ambulacral spines, excepting the innermost one, 

 wliicli is much larger and stouter. Two large spines are thus conspicuous at 

 each mouth-angle and are directed towards the centre, tlie series entirely 

 closing the peristome, which is remarkably small. The small mouth-spines 

 upon the margin of the plate interlock with those of the adjacent mouth- 



