KNOTTY CUSHION-STAR. 



127 



tubercles surrounds their margins. The under surface is 

 bordered by similar but natter rows of spiniferous plates 

 with those above. These plates are pentangular. The 

 triangular spaces between the avenues are covered with 

 mammiform tubercular spines, similar to those on the 

 upper side, but smaller, and not placed as on the upper 

 surface in the centre of plates. The intermediate spaces 

 are interspersed with minute tubercles, which, however, 

 do not surround the bases of the spines in a regular manner 

 as they do on the upper side. Forceps-like spinules, simi- 

 lar to but larger than those on the upper side, are arranged 

 in regular transverse and longitudinal rows in each of 

 the triangular spaces. The margins of the avenues are 

 bordered by longitudinal rows of spines arranged in pairs, 

 and an outer series of plates, each bearing from three to 

 five long obtuse blunt spines, placed in transverse rows. 

 Each arm is terminated by a blunt and regular tubercle. 

 When fresh, Mr. Wingate states his specimen was of a 



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