205 



Having but a single specimen of this character, I hesitate 

 at present to designate it as a distinct species. 



Glyptaster inornatus (Hall). 



Body somewhat nrnshaped, abruptly spreading at the base, 

 with the sides nearly straight or moderately expand- 

 ing; pentangular, the angles corresponding to the rays, 

 becoming ten angled above the division of the rays. 

 Basal plates much developed, distinctly pentangular, with 

 the lower margins expanded and thickened, with a double 

 or triple node on each one, and spreading beyond the 

 column. Subradials large, six-sided, except the one on 

 the anal side which is seven sided. First radials about 

 equal in size to the subradials ; heptagonal (as usual in 

 the genus). Second radials much smaller, quadrangular, 

 and pentangular in the postero-lateral rays. Third 

 radials a little larger than the second, heptagonal. Supra- 

 radial series consisting of four or more plates before be- 

 coming free, with an inter-supraradial space which is 

 occupied by five or more plates. First interradial plate 

 but little smaller than the first radial, octagonal, and sup- 

 porting much smaller plates in the second range, three 

 in the third range and several smaller plates above. 

 On the anal side the first plate is octagonal, as large or 

 larger than the first interradial plate, and resting on the 

 heptagonal subradial plate, supporting four plates in the 

 second range, with ten or twelve plates irregularly dis- 

 posed above. 



The subradial plates are prominent in the middle, with 

 low undefined angular ridges extending to the sides of plate, 

 the intermediate spaces depressed. The ridges from the 

 centre to the upper sides of the plate are a little more pro- 

 minent, and meet at the sutures with similar ridges on the 

 lower sides of the first radials, these uniting on the centre 

 are continued in a stronger ridge along the centre and fol- 



[Trans. iv.) 2S 



