_ Echinoid Radioles, Anaulocidaris. — 153 
es oral ca? 
Text-fig. 23. 
Length of blade in median line . oO O75 
Greatest length of radiole . Die 5:8 
Greatest width ; 12°8 11°45 
Distance of greatest width a sista ena 50 30 3:5 
MenotimomiNeassides 0 8. a.) = & SiS 9:0 80 
Renate Ole SmiSICCi ue) - ape, LOD 775 74 
Median vertical thickness at eanator Pues ep 1°0 O's 
Greatest thickness along the line x-y . 13 O75 & OO O7 
NVidtheateannulice mem 2 5 se ewe 83 25 ie) ual 
ithicknesssateannulus™ = 2° 2 ye 235 15 14 
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 which the acetabulum remains visible 
when 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 twice 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 Jeruzsalemhegy and 
lettered a—w, 13 are selected for measurement (in millimetres) and outline drawings. 
All these figures show the inner face only. 
Pai ‘a 
a 
Length of blade in median line 8:2 9:2 74 73) 
Greatest width of blade . . 12°75 15°7 10°7 10°9 
WensthwofeN sides. eta io 10°7 8 8°25 
WengthionS, sides (20). }) 55 fea 45 4:2 
Thickness at the centre of 
UaerInIEVoleS es Seah Wane os Lied) 1°3& 0.7 0-9 10 
Greatest thickness along the 
Li Cui Mists toy ks es bre 132 11 10 
Width at annulus. .. . 2°8 370 2a} 19 
Thickness at annulus. . . 2°1 2°8 19 itt 
