Echinoid Radioles, Cidaris alata. 
177 
the pustules are widened and appear as though their ends had been worn into a 
slight concavity, e. g. specimen h from Jeruzsälemhegy (fig. 294). This should 
not be confused with the structure found in certain radioles called C. scrobiculdta. 
ln these peripheral radioles the sagittal line of the adoral face is curved concavely 
in the proximal half of the blade and convexly in the distal half. 
The micro-structure of one of these radioles has been described above (see 
p. 174, PI. XIV, fig. 441). 
The beginning of the modification that affects the radioles presumed supra- 
ambital is shown by specimen e from Jeruzsälemhegy (fig. 295). The adapical 
face is slightly excavate in its distal half, and the pustules, which tend to lie in 
oblique transverse rows, begin to assume the form of adpressed spinelets. 
From Cutting I comes a fragment of the distal end of a small radiole, lettered 
a (figs. 296—298). This is very thin and the adapical face bears a few large 
irregulär pustules, vvhile tovvards the margin it is slightly plicated and not pustulate. 
Towards the distal end of its adoral face the pustules increase in size and are 
extended, producing the appearance of cylindrical spinelets prone on the surface. 
This may be the distal end of a radiole similar in form to specimen / from Jeru¬ 
zsälemhegy, (figs. 299—300) but of larger size. In j is a curious extension of the 
vanes into the body of the shaft, producing a form like that described later on as 
Radiolus penna. 
The supra-ambital radioles show greater differences from the Cassian forms. 
A good example is the finely preserved holotype from Jeruzsälemhegy, lettered f 
(figs. 301, 302). This has a beautifully serrate (distally almost plicate) margin all 
round the blade The smaller pustules on the adoral face are 3 or 4 within a 
length or width of 2 mm. The pustules in the proximal - half of the adapical face 
are widened and flattened almost like scales in four transverse rows, occupying a 
length of 7 mm.; at the distal end of the face is a sort of shallow cup, in the 
middle of which are smaller pustules. A similar feature is observed in other 
radioles from Jeruzsälemhegy, and in one of those ( b ) from Cutting I. In the latter 
(figs. 303, 304) the distal end of the adapical face is slightly depressed, and an 
irregulär curved band of pustules forms a proximal border to the depression. 
In radioles supposed to come from the adapical region, the further develop¬ 
ment of this depression or cup has produced the goblet shape that has suggested 
the name of the mutation. In one of these (c), from Cutting I (fig. 305), the bilat¬ 
eral symmetry of the blade is still manifest, the proximal border of pustules is 
continuous with the distal border of the radiole, and encloses a shallow cup, in 
the middle of which are a few ridges of pustules. In the other adapical radiole 
from Cutting I, lettered d (figs. 306, 307), the original bilateral symmetry is scarcely 
to be detected; the bands of pustules are more continuous, almost right round 
the radiole; the edge of the cup is irregularly plicated in places. The general 
appearance is that of a cup-coral, with the aspect of an irregulär columella produced 
by the tubercles within the cup. 
The radiole last described might well belong to C. dorsata , but, since normal 
examples of that species are not known from Cutting I, it is more likely to 
be C. alata. There is, however, a similar radiole from Jeruzsälemhegy, where 
C. dorsata is fairly common. This radiole, (lettered g figs. 308, 309), has a more 
clearly marked, broad, shallow cup, almost at right angles to the long axis of the 
12 
Resultate der wissenschaftl. Erforschung des Balatonsees 1 . Bd. 1 . T. Pal. Anh. 
