92 
‘Triassic Echinoderms of Bakony. 
tract. The ring comprises 18 distinctly mamelonate, imperforate tubercles, relatively 
small and widely spaced, alternating with pairs of miliaries radiately disposed, the 
adcentral of each pair usually being the smaller. These tubercles and miliaries are 
fairly clear and regular in the lateral tracts, but are less differentiated in the upper 
and lower tracts. From the scrobicular tubercles faint folds pass towards the boss 
and meet slight folds continuing the crenellae; but it is not clear whether these 
two. sets of folds merge, or alternate, or are indifferent. The appearance suggests 
that in an earlier stage either of individual or racial development, when the scro- 
bicule was circular, each crenella was connected by a fold with each scrobicular 
tubercle, but that, with the compression and distortion of the ring, this connection 
became obscured. Further remarks on the relations of tubercles to folds will be 
found on page 98, the last paragraph under Anaulocidaris testudo. 
The extra-scrobicular surface is covered with coarse miliaries of varying size. 
In the adradial tract, which has a transverse diameter of about 2.2 mm., these 
miliaries are irregular; but in the interradial tract, with a transverse diameter of 
about 1.1 mm., they tend to run in rows. 
The adradial margin is bevelled on the inner surface to a thin edge, and is 
marked by about 16 faint grooves, separating broad flattened denticles. The other 
sutural surfaces are slightly bevelled and grooved. 
Relations of the Species. — This is another form that exemplifies the 
difficulty of distinguishing Eotiaris from Miocidaris; indeed it would have been 
placed in Eotiaris had the retention of that genus proved possible. From the species 
hitherto assigned to Eotiaris, it differs in the scrobicular ring and extra-scrobicular 
miliaries, and these characters also separate it from Miocidaris verrucosus. It is 
distinguished from J. Cassiani by the greater width of the plate, the greater relative 
size of the mamelon, the flush and sub-elliptical scrobicule, the more prominent 
scrobicular tubercles, and the less regular extra-scrobicular ornament. In the flush 
sub-elliptical scrobicule, it approaches the specimen figured by Lauper as Cidaris 
Klipsteini (vide supra, p. 84), but in other respectsis quite different. From M. subcoronata 
it differs in the shape of the boss, the smaller size of the scrobicular tubercles, the 
less sunk scrobicule, the width of the plate, and minor points. 
Miocidaris sp. indet. %. 
(Plate VII. fig. 160.) 
Material. — An interambulacral from the Raiblian beds of Cutting I on the 
Veszprém-Jutas Railroad. 
Description of the Specimen. — The plate is pentagonal, with adradial 
margin oblique to the transverse axis; the transverse margins curved, one convex 
the other concave. The convex margin is that towards which the adradial margin 
slopes ; it appears to have been slightly bevelled underneath. The opposite concave 
margin is grooved. If the convex margin be adapical, and the concave margin 
adoral, as the bevels lead one to infer, then the convexity and concavity are not 
in harmony with SpanpDEL’s account of M. Keyserlingi, which, however, we have 
already discussed (pp. 86-—88) and found inconsistent Of the two interradial sides, that 
next the convex (adapical) margin is slightly the longer. Transverse diameter of 
plate, 13.2 mm.; meridional diameter, 8.8 mm. 
The main tubercle, of which the centre is 5.5 mm. from the adradial margin 
