220 
Triassic Echinoderms of Bakony 
Description of St. Cassian specimens. — Münster described the 
radioles as rare. Koechlin-Schlumberger had fifteen in bis collection ; the British 
Museum bas fifteen from the Klipstein Collection (regd. 36486) and two from the 
J. E. Lee Collection (regd. E 1023). Other specimens are in most of the large 
collections. The species therefore is not among the rarest of Cassian forms. 
The radiole consists of a massive shaft and a relatively small base. 
The shaft consists of a stout ornamented blade, and a short smooth handle 
tapering rapidly towards the base. 
The blade of the shaft increases equably in diameter from the handle to the 
distal end or crown It was described by Münster as very triangulär, and this 
has been interpreted (e g. by Schlumberger) to refer to the cross-section. Laube 
(1865) also described the cross-section as markedly three-sided, usually with the 
form of an acute isosceles triangle, and sometimes extended in a vane on the acute 
angle I have never seen a section of this form, nor has one been figured. 
Schlumberger said that the section might have one straight side and a rounded 
back, and this is the shape of the section figured by Münster. It is in fact the 
usual shape, and the Variation mainly consists in the greater or less elevation of 
the back, and in the slight concavity of the flattened face. Increase of the concavity 
and depression of the back would perhaps produce the flattened symmetrically 
bicarinate form also mentioned by Schlumberger and compared by him with C. alata ; 
but I have never seen a form that really resembled that species. The flattened side 
was probably in the transverse plane, and comparison with other species, such as 
C. alata or Anaulocidaris leads one to regard it as the adapical face. Quenstedt, 
however (1875), seems to have taken the peculiar view that one of its margins 
was uppermost. The occasional concavity of this face suggests that it received 
the rounded back of the adjoining radiole, whether the one above it (as 1 suppose) 
or below it. Such a rational Interpretation is not permitted by Quenstedt’s Orien¬ 
tation. The outline of this side may be compared to an isosceles triangle, with 
apex below varyingly truncate by the handle, and with base concave upwards 
vvhere it meets the crown. Its margins are generally sharp, but scarcely carinate, 
and occasionally one may be truncate, probably where it abutted on an adjoining 
radiole at the side. The section of the shaft may be bilaterally symmetrical, but 
often one slope is longer or flatter than the other. 
The distal end of the shaft forms a distinct crown, gently swollen, usually 
highest at about one-third of the distance from the rounded back, and always 
sloping more steeply to the back; it meets the sides of the radiole usually in a 
clear-cut angle, particularly the flattened side, and the edge of the angle may be 
raised in a slight rim. 
The ornament of the shaft is variable, but it has a character of its own and 
the variations are not so haphazard as Schlumberger maintained. Taking as the 
simplest, though not necessarily the primitive form, a surface irregularly but closelv 
strewn with small rounded granules like those common in C. dorsata, we note that 
such an Ornament rarely, or (pace Schlumberger) never, covers the whole surface. 
There is a tendency for these granules to lie in transverse rows, and this is more 
marked on the flattened face Even where least obvious, the tendency can still be 
detected in the proximal region of that face. Usually the granules in the proximal 
rows on that face run together so as to form transverse ridges, and these may 
