Echinoid Radioles, Cidaris decoratissima. 
215 
granules; the next stage is a ridge broken up into pustules, vvhich, as the ridge is 
followed distalwards, seem to fuse, until the distal portion of the ridge is a bare 
unornamented keel: any of these stages might be rriore dominant in an older or 
vounger radiole, or in one from a different part of the test. The obliquity of the 
basal structures is almost certainly a feature correlated vvith position on the test, 
and a constant character of no species. 1 The crenelation of the acetabulum, when 
so irregulär as in this specimen, has rarely great importance. 
Material from Bakony, — The preceding remarks may explain why 
it is that the follovving specimens are dealt with here, although they do not closely 
resemble the lectotype. They are 4 complete radioles and 3 fragments from the 
Raiblian of Jeruzsälemhegy, and one fragment from a limestone at Veszprem, Also 
Erdö (lower wood) assigned to the horizon of the Reingrabner Schichten, presum- 
ably Lower Raiblian. 
The last mentioned fragment is exceedingly imperfect, but shows on one side 
six ridges, apparently composed of fused pustules and like those of C. decoratissima. 
Of the specimens from Jeruzsälemhegy, the one superficially most like the 
lectotype is the proximal half of a radiole (PI. XIII, flg. 393.', with a similarly oblique 
base and curved handle. The collerette, however, is much shorter, so that the 
curvature affects the proximal region of the shaft. The ribs of the shaft number 
11, and are broken up into pustules proximally, while distally they form plainer 
ridges. It is in this last respect that the specimen seems to approach C. decora¬ 
tissima rather than C. parastadifera. 
Another proximal portion from Jeruzsälemhegy has about 20 pustuiace ribs ; 
some of them, which are finer and more broken up than the rest, are grouped in 
two longitudinal depressions, asymmetrically placed one on each side. The broken 
distal end shows a central marking suggestive of a large axial complex or lumen 
filled with secondary calcite. The looseness of the interior may have led to some 
crushing during life, and thus given rise to the depressions with their finer ribs. 
For the rest, the Ornament resembles that of C. decoratissima, and the measure- 
ments are greater than in C. parastadifera. The collerette, however, is quite short. 
Diameter at annulus, 3'4 and 3‘8 mm.; at distal end, 3'6 and 4'5 mm. 
The four fairly complete radioles from Jeruzsälemhegy are ill-preserved and 
weathered, and at least one of them was rolled before fossilisation. Therefore, 
though the ribs are clearly shown, the pustulation is but obscurely indicated. In 
one of the specimens (hg. 396), which is short, and rather swollen, the ribs are 
strongly marked, and probably were but slightly pustulate. Between some of them 
are indications of lines of granules. Two of these radioles have a deep hollow at 
the distal end, indicating an axial lumen. 
The remaining specimen from Jeruzsälemhegy is marked IX 57 by the collcctor, 
Professor Laczkö, and was sent to me as « Cidaris Braunit’> (figs. 394, 395). 
Though only a distal half, it is well preserved and shows clearly the characters 
that were probably possessed by the four complete radioles. Length 133 mm.; 
diameters at proximal end, 3'8 and 3'9 mm.; thence the shaft tapers in fusiform wise 
distalwards. Though the dorsoventral compression is almost nil, there is a difference 
1 It is considered to be a diagnostic character of C. Hausmanni; but see the discussion of 
that species (p. 206 & p. 213). 
