Echinoid Radiales, Cidaris Hausmanni. 
205 
Material from Bakony. — A single radiole from the Cassian beds of 
Cserhät (Leitnerhof). (PI XII, figs. 368, 369.) 
Shape between pyriform and fusiform. 
Length, 4'8 mm. Greatest diameter, 17 mm. Diameter at annulus 0"8 mm. 
3 ribs, and 3—3'5 pustules, in a width of 1 mm. The characteristic basal struc- 
tures, though somewhat worn, can be distinguished (fig. 369). 
«Cidaris» Hausmanni mut. nov tofacea } 
(Plate XII, figs. 370, 371.) 
1904. Cidaris Hausmanni Wissm., Broili : Palaeontographica L, p. 154, pl. xvii, ff. 25, 26. 
D i a g n o s i s. — C. Hausmanni of smaller size, the average length being 
3'5 mm.; ridges obscure and changing into obscure, irregulär pustules at the distal 
end of the shaft, with intervening grooves relatively narrovv, pustules of ridges 
obsolete or nearly so; base less oblique than in the typical form. 
Holotype. —- The specimen flgured Pl. XII, figs. 370, 371. (Brit. Mus. P2 
4697 a), from the Pachycardientuffe of the Seiser Alp. 
Broili States that the radioles are common on the Seiser Alp; he describes 
them as small and as easily recognised by the regulär rows of pustules. 1 have 
examined his numerous specimens at Munich, and have more closely studied three 
taken therefrom at random and now in the British Museum (E 4697 a, b, c.) 
Broili 
Broili 
B. M. 
B. M. 
B. M. 
f. 25 
f. 26 
a 
b 
C 
Swollen 
Irregulär 
Oblique 
Swollen 
Shape Pyriform 
fusiform 
swollen 
thyrsiform 
fusiform 
Length. 3'4 
37 
3'2 
3-2 
3'4 
( 1 >8 
Greatest diameter.^ 
L8 
♦ 275 
2-2 
2-0 
2'0 
2-4 
Diameter at annulus. 0'5 
07 
0-9 
L0 
ca. 0'8 
Number of ribs in a width of 1 mm. 4 
3 
2-5—3-5 
3’4 
ca. 3 
Number of pustules in a length of 1 mm. — 
— 
? 3*5 
— 
— 
As regards size, the preceding table, 
based on 
Broili’s 
figures and 
on the 
three British Museum specimens, shows that these radioles are considerably shorter 
than the Cassian forms, the respective averages being about 3'5 and 6 mm. Their 
diameter is also less, but not so much less, for their shafts are relatively stouter, 
rarely thin fusiform, but swollen and rather irregulär. 
An extreme regularity in the ridges is indeed depicted in Broili’s figures; but 
in the first place this, as already shown, is not characteristic of C. Hausmanni 
iypica, and in the second place, it is not constant or even common in the radioles 
from the' Pachycardientuffe. Here the ridges are quite as vvavy and anastomosing 
as in the Cassian radioles, and have the further irregularity that none passes clearly 
to the distal end, which is covered with confused pustules. 
As for the pustules, «Körner», said to compose the ridges, they are conspicuous 
by their absence in Broili’s own figure 26, and scarcely to be detected in a fused 
Tofaceus or iophaceus, because found in tophus, tuff. 
