Echinoid Radioles, Anaulocidaris. 
141 
vvhich are the more numerous, and, on the whole, better preserved. ßut 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 vvhich the radioles can easily be 
sorted. These are, beginning with the adoral radioles, which are the least modified, 
and passing upwards: 
1 . Radioli rem i form es, corresponding to the Cidaris remifera of Münster, 
narrovv, slightly curved, with the handle in the same curve as the blade. 
2. Radioli spatuliformes, corresponding to the Cidaris Buchi of Münster; 
the blade is subcircular and forms an obtuse angle with the handle. 
3. Radioli trulliformes, corresponding to the shape hgured by Benecke 
(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 Zittel (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. testudo, will now be more minutely described. 
1 . Radioli remiformes. 
(PI X, figs. 256—261.) 
From among the 58 specimens of this form found at Jeruzsälemhegy, 7 are 
selected for measurement (in millimetres). 
a 
b 
c 
e 
/ 
s 
h 
Length ...... 
12-5 
13-9 
157 
197 ? 
17'8 
17’0? 
17-3 
Greatest width .... 
Distance of greatest width 
3-5 
7'5 
6'5 
8-5 
10-5 
8‘8 
10-5 
from distal end . 
3‘4 
5-5 
67 
8'3 
87 
7'3 
7'8 
Thickness at same level . 
1-3 
175 
1*3 
2-0 
27 
2'0 
1-8 
Greatest thickness. 
Distance of same from 
1*5 
27 
D3 
2‘4 
2-3 
2'3 
2'25 
distal end. 
6'2 
87 
67 
11 '5 
127 
1L4 
11'3 
Least width at collerette 
1 ‘45 
2'0 
— 
— 
— 
— 
— 
Thickness at same place 
IT 
L4 
i B 
— 
—• 
— 
■— 
Width at annulus . 
2-1 
2-0 
1 '8 
— 
3-0 
— 
2'8 
Thickness at annulus 
Distance of annulus from 
X'7 
17 
17 
— 
27 
— 
2'0 
acetabulum .... 
L3 
D2 
— 
— 
— 
— 
— 
Width at acetabulum 
075 
0-8 
— 
— 
— 
— 
— 
Thickness at acetabulum 
0-5 
07 
— 
—. 
— 
_ 
_ 
