—_— 
Echinoid Radioles, Anaulocidaris. ‘141 
which are the more numerous, and, on the whole, better preserved. But what is 
said applies equally to the rest. 
Although a large number of radioles collected at random presents a continuous 
series of varying forms, uniting without a break the vastly different extremes of 
the series, still there are four main shapes into which the radioles can easily be 
sorted. These are, beginning with the adoral radioles, which are the least modified, 
and passing upwards: 
1. Radioli remiformes, corresponding to the Cidaris remifera of MunsveEr, 
narrow, slightly curved, with the handle in the same curve as the blade. 
2. Radioli spatuliformes, corresponding to the Cidaris Buchi of Munster ; 
the blade is subcircular and forms an obtuse angle with the handle. 
3. Radioli trulliformes, corresponding to the shape figured by Brnrckr 
(1884), trowel-shaped, the blade hexagonal, wider than long, forms an angle of 
60°—70° with the handle, which is marginal. 
4. Radioli paletiformes, corresponding to the supposed Anaulocidaris 
interambulacrals of Zirre. (1879), shaped like a plasterer’s palette, blade hexagonal 
or pentagonal, not much or not at all wider than long, nearly or quite at right 
angles to the handle, which is removed from the margin and may even attain a 
subcentral position. 
These forms, as manifested in A. festudo, will now be more minutely described. 
1. Radioli remiformes. 
(Pl X, figs. 256—261.) 
From among the 58 specimens of this form found at Jeruzsalemhegy, 7 are 
selected for measurement (in millimetres). 
Text-fig. 12. ‘ 6 \) % 
\y 
a b c € 
: VE g h 
(Genetic aeelute sili. ios 13°9 GPF 191 ° 17°8 17:0? ilie/se3} 
Greatest width. . . . 3°5 PD Gib 85 105 8°8 10°5 
Distance of greatest width 
from distalend .. . . 34 yt) 67 83 82 73 78 
Thickness at same level . 1°3 1°75 153} 2:0 Dail iO) 18 
Greatest thickness. . . 1°5 21 le 2°4 2:3 2:3 2°20 
Distance of same from 
Gistalvendiena ie saves) Or 81 67 Nees) eRe 11°4 Mire 
Least width at collerette 1°45 2°0 — —_ _- — — 
Thickness at same place 1°1 14 -- — — = == 
Width at annulus. . . 2°1 2°0 18 — 30 = 2°8 
Thickness at annulus . 1°7 a7 i161] -— 22 — 2:0 
Distance of annulus from 
ACELADUNIMN ae etn fe SlES ee — — = == = 
Width at acetabulum . 0°75 08 - a — — ae 
Thickness at acetabulum 0°5 O'7 == = 
