Echinoid Radioles, Cidaris Hausmanni. 205 
Material from Bakony. — A single radiole from the Cassian beds of 
Cserhat (Leitnerhof). (Pl XII, figs. 368, 369.) 
Shape between pyriform and fusiform. 
Length, 48 mm. Greatest diameter, 1°77 mm. Diameter at annulus 0°8 mm. 
3 ribs, and 5—35 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., Broii: Palaeontographica L, p. 154, pl. xvii, ff. 25, 26. 
Diagnosis. — C. Hausmanni of smaller size, the average length being 
3°5 mm.; ridges obscure and changing into obscure, irregular pustules at the distal 
end of the shaft, with intervening grooves relatively narrow, pustules of ridges 
obsolete or nearly so; base less oblique than in the typical form. 
Holotype. — ‘The specimen figured Pl. XII, figs. 370, 371. (Brit. Mus. E 
4697 a), from the Pachycardientuffe of the Seiser Alp. 
Bromr states that the radioles are common on the Seiser Alp; he describes 
them as small and as easily recognised by the regular rows of pustules. I 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, 8, c.) 
Brot Broiit B. M. Bevis B. M. 
f, (29 f. 26 a b c 
Swollen Irregular Oblique Swollen 
Shape : Pyriform fusiform swollen thyrsiform fusiform 
engstirsie) cA stn ame TER RT 3°4 37 32 on 3°4 
: 1°8 1°8 Ole Dae 2:0 
Greatestndiameter; : = = . . ) 2-0 2-4 
Diameter at annulus . “2. es. ; Ord O'7 og 1°0 ca. O'8 
Number of ribs in a width of 1 mm. 4 3 2°5—3'5 34 Cay 
Number of pustules inalengthof 1mm. — — ?3°5 -- — 
As regards size, the preceding table, based on Bromi’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 6mm. _ Their 
diameter is also less, but not so much less, for their shafts are relatively stouter, 
rarely thin fusiform, but swollen and rather irregular. 
An extreme regularity in the ridges is indeed depicted in Brow’s figures; but 
in the first place this, as already shown, is not characteristic of C. Hausmanni 
typica, and in the second place, it is not constant or even common in the radioles 
from the Pachycardientuffe. Here the ridges are quite as wavy 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, «K6rner», said to compose the ridges, they are conspicuous 
by their absence in Bromi’s own figure 26, and scarcely to be detected in a fused 
1 Tofaceus or tophaceus, because found in tophus, tuff. 
