Il6 FISHER 



spinelets in fasciolar grooves. Superomarginal covering is to 

 be considered as a spinelet rather than granules. 



Inferomarginal plates much wider than long, encroaching 

 more onto actinal area than do superomarginals onto abactinal, 

 and corresponding in position to superomarginals. Spinelets, 

 densely covering surface of plates, larger than those of supero- 

 marginals, and increasing in size toward outer end of plate 

 which projects slightly beyond adjacent end of superomarginal, 

 thus defining the ambitus. Inferomarginal spinelets granuli- 

 form in middle of plate, often attaining a squamiform appear- 

 ance at outer end; spinelets in fasciolar furrows, slender. No 

 enlarged spines of any sort on either marginal series. Termi- 

 nal plate small, granulose, deeply notched below. 



Actinal interradial areas large ; intermediate plates low-pax- 

 illiform, arranged in chevrons, the series adjacent to adambu- 

 lacrals extending about three-fourths length of ray or to eighth 

 inferomarginal. Plates decrease in size toward margin, are 

 strongly imbricated internally, and the paxillar crowns which are 

 composed of about 25 to 30 clavate obtuse, not very crowded, 

 spinelets (slender when dry) surmount a low convex elevation 

 or tabulum. Well-defined fasciolar channels separate these 

 tabula. 



Adambulacral plates about as wide as long, with a slightly 

 rounded, angular furrow margin, the angularity being more 

 pronounced in vicinity of mouth plates. Armature consists of 

 (1) a furrow series of 4 (sometimes 3) terete or slightly flat- 

 tened bluntly pointed tapering spinules about as long as plate 

 and graduated in length orad, the longest spine being on aboral 

 end of plate ; or the spinules may be disposed like rays of fan 

 and graduated in length toward either end of series. (2) On 

 actinal surface are about 3 longitudinal series of smaller spine- 

 lets, decreasing in length toward outer edge of plate where the 

 spinelets are like those of actinal intermediate plates. Four 

 spinelets commonly occur in the inner actinal series and about 

 3-5 in each of the outer; or the 2 latter series may be wanting, 

 the spinelets, instead, forming ah irregular group, especially on 

 outer part of ray where there are frequently upwards to 16 or 

 20 actinal spinelets. 



