Echinoid Radioles, Anaulocidaris. 
153 
Text-fig. 23. C 
4 '*n 
/rrrrffö Jr 
CD 
Length of blade in median line .... 
7 
9-0 
5-0 
575 
Greatest length of radiole ...... 
9-25 
5-2 
5-8 
Greatest width. 
19‘2 
12-8 
11-45 
Distance of greatest width from distal end 
5-0 
3-0 
3'5 
Length of N. side. 
13‘5 
9-0 
8-0 
Length of S side. 
10-5 
7T5 
7‘4 
Median vertical thickness at equator . . 
1-2 
ro 
0-8 
Greatest thickness along the line x-y . 
L3 
075 & 0'9 
07 
Width at annulus. 
325 
2-2 
24 
Thickness at annulus ....... 
2-5 
1-5 
1-4 
The outline of r is heptagonal; on 
its outer 
face striae pass 
towards the 
centre from S., SW., SE., and E. margins. 
The outline of s is subheptagonal. 
It is very difficult to draw any line between the radioli trulliformes and the 
paletiformes. There are two criteria that may be roughly employed. The trulli¬ 
formes may include: first, all specimens in vvhich the acetabulum remains visible 
vvhen the radiole is placed on a horizontal plane, with its outer face uppermost, 
and viewed vertically from above; secondly, all specimens in which the width of 
the blade (E.—W.) is more than tvvice the length (N. —S.). These two characters, 
however, are not strictly correlated. 
4. Radioli paletiformes. 
(Pl. X, figs. 270—272.) 
From among the 23 specimens of this form found at Jeruzsälemhegy and 
lettered a — w, 13 are selected for measurement (in millimetres) and outline drawings. 
All these figures shovv the inner face only. 
Length of blade in median line 
Greatest width of blade . 
Length of N. side . . . 
Length of S. side . . . . 
Thickness at the centre of 
the blade. 
Greatest thickness along the 
line x —y . 
Width at annulus . 
Thickness at annulus . . 
a 
c 
8-2 
9'2 
1275 
157 
9-3 
107 
5'5 
74 
1-2 & LO 
L3 & 07 
L2 
1-2 
2'8 
3-0 
27 
2-8 
e h 
7-4 
Tb 
107 
10-9 
8'2 
8-25 
4-5 
4'2 
0-9 
ro 
14 
ro 
2-3 
L9 
L9 
1 '5 
