180 
Triassic Echinoderms o f Bakony. 
« Cidaris » dorsata marginata mut. nov. 
(Plate XI, figs. 312—333 and Plate XIV, fig. 439.) 
D i a g n o s i s. — C. dorsata in vvhich the micro-structure is coarser than in 
the norm, and the radiate septa of the inner layer become adcentrally so irregulär 
as to resemble an axial complex ; in which the pustules on the adapical face of 
the radioles are well marked and frequently produced into depressed spinelets, 
especially in the supra-ambital radioles; in which the distal end of the supra-ambital 
and adapical radioles tends to be excavate. and is frequently limited by a rim of 
confluent pustules. 
Material. — It is probably correct to refer all the Raiblian radioles of 
C. dorsata to this mutation, although a few cannot be certainly distinguished from 
the norm of the species. Thus, I would place here the specimen from the Raibler 
Schichten of the Wettersteingebirge ügured by Schafhäutl (1865, pl. v, f. 3) as 
«Cidaris pirifera Agassiz» ; the original is in the Palaeontological Museum, Munich. 
Similar specimens from the Cardita Schichten of Issjöchl are at Vienna (Geolog. 
Reichsanstalt). A list of Raiblian localities is given by Wöhrmann (1889). The frag- 
ments from Rammelsbach (Seehaus) which he figures (pl. v, f. 14) as Cidaris Brauni 
seem more probably to be this form or possibly C. alata poculiformis. Here may 
also perhaps be placed the « Cidaris alata Goluf.» of Schafhäutl (1863, Süd- 
Bayerns Leth. Geogn. p. 341, pl. lxv /, f. 23 a, b, «im schwarzgrauen Thonmergel, 
der Schachenalpe am Wetterstein». 
The following localities in Bakony have yielded specimens: Jeruzsälemhegy, 
about 33; Veszprem-Jutas Railway, Cutting I, 3 ill-preserved fragments. 
Holotype. — Specimen o from Jeruzsälemhegy (pl. XI, figs. 319—321). 
Description of the specimens. — The radioles from Jeruzsälemhegy 
present an almost complete series, from the small presumably infra-ambital forms, 
and the pyriform or subclaviform ambital radioles, all of them differing but slightly 
from the corresponding radioles of the norm, through the more flattened, distally 
excavate, supra-ambital forms, up to the adapical radioles with truncate excavate 
ends, closely similar to the adapical radioles of C. alata poculiformis. Examples 
of these different forms from the Jeruzsälemhegy material will now be described 
in order. 
In any well-preserved radiole, from any region, the adoral face is distinguished 
from the adapical by the smaller size of its pustules, except at the distal end, 
where the pustules resemble those on the adapical face. Thus in the shaft of a 
small infra-ambital radiole, lettered a (figs. 312, 313), fine pustulation extends about 
7'5 mm. out of a total length of 1T2; these pustules are low and about four lie 
within a length of 2 mm. The distal region of the same face is occupied by two 
transverse rows of adpressed spinelets, of which three occupy a width of 2'5 mm., 
and the length of each may be as much as 1'4 mm. The adapical face is irreg- 
ularly covered by pustules similar to those last described, but not quite so long 
or so adpressed, especially in the proximal region, where about four occupy a 
width or length of 2'5 mm. At the sides the pustules are slightly longer and 
slightly flattened, thus showing a faint tendency to the formation of vanes. 
