CRINOIDS AND BLASTOIDS. 195 



GENUS SCAPHIOCRINUS Hall (emend. W. & Sp.) 



SCAPHIOCRINUS ELEGANTTILUS (nOV. Sp.) W. & Sp. 

 PL XVII, Fig. 13. A beautiful specimen with arms and portions of the stem. 



This small and elegant Crinoid resembles very closely Scaphio- 

 crinus nanus M. & W. from the Lower Burlington limestone, 

 and perhaps should only be considered a variety of that species. 

 The Burlington form, however, differs in having a more de- 

 pressed calyx, larger underbasals and higher brachials. 



The LeGrand specimens are always light in color. 



Calyx turbinate, the sides very slightly convex ; a little wider 

 than high; without ornamentation. Underbasals projecting be- 

 yond the column; the upper angles turned upward to meet the 

 basals. Four of the basals are hexagonal, about as wide as 

 high, the fifth one heptagonal, and larger throughout. Radials 

 but little larger than the basals, and almost as high as wide; 

 the upper face truncated throughout the width of the plates. 

 Brachials one to the ray ; axillary ; nearly twice as high as the 

 radials; obtusely angular for the reception of the first arm- 

 joints; not constricted in the middle, and, when the arms are 

 closed, their lateral faces almost meeting with those of their fel- 

 lows from adjoining rays. 



Arms dividing once from the brachials up, the division taking 

 place generally from the sixth plate. The arms are com- 

 paratively strong, waving in outline, and composed of cuneate, 

 slightly convex and rounded pieces, about as high as wide or 

 nearly so. Pinnules very conspicuous, long, unusally stout, 

 and composed of cylindrical joints twice as long as wide. Azy- 

 gous side exceptionally wide. The posterior basal extends to 

 one-half the height of the radials, and supports upon its trun- 

 cate upper side the anal plate, which to a large extent forms a 

 part of the ventral tube. The azygous plate, to the right of 

 the anal plate, is also unusually large, pentagonal, and extends 

 very nearly to the top of the right postero-lateral radial, 

 although that plate, as in most of the Poteriocrinidae, occupies 

 a higher level than the radials of the other rays. 



