210 Triassic Echinoderms of Bakony. 
enough to show that Wourmann was probably correct in referring the form to 
C. parastadifera. (Figs. 376, 377). 
The pustules have in general the shape described by ScuaFHAuTL; in many 
specimens they closely resemble his figure 8 d. The lateral series in compressed 
radioles and the distal-most pustules of subclavate radioles are more thorn-like, and 
in some specimens the pustules have longer stems with cylindrically rounded backs. 
In nearly all specimens the pustules are mounted on ridges; but occasionally, on 
the adoral face or near the distal end of a subclaviform radiole, the pustules seem 
to rise directly from the body of the shaft. Sometimes on the adoral face the 
pustules can scarcely be detected, while the ridges, especially in the distal region, 
are quite well marked. These ridges generally pass almost straight from their com- 
mencement at the proximal end of the shaft to the distal end, where they may 
die out or merge. Occasionally they curve, sometimes without apparent reason, 
sometimes to admit the intercalation of fresh ridges in a rapidly swelling shaft, 
or to take the place of ridges that die out in a tapering shaft. 
ScHAFHAUTL gives the number of pustules to a ridge as 9 in a radiole of 85 mm. 
In the Bakony material this number is found in the lateral series of some specim- 
ens of the same length, but the number in the other rows is greater, namely, 10 
or 11 on the adapical face and about 14 on the adoral face. In the long radiole 
from Cutting IV, one of the ridges on the adapical face is 11°5 mm. long and bears 
18 pustules; these are small and close together in the proximal region, but half- 
way down the shaft 3 go to every 2 mm. A stouter radiole from Jeruzsalemhegy 
has 20 pustules in a ridge 11 mm. long on the adapical face, the increased number 
being due not to greater closeness but to the curvature of the ridge. 
The pustules are occasionally in transverse rows on one face of the radiole, 
if not all round it; but it follows from the different sizes of the pustules in the 
different ridges that this arrangement can not be «usual», as ScuarnAuTL calls it. 
Frequently the difference between the ridges is such that the pustules of adjacent 
ridges are in no obvious relation. In the subclaviform radioles, where the pustules 
are of more equal size, they are often so disposed as to form oblique series crossing 
one another. 
The base is small in proportion to the size of the radiole; the acetabular 
cavity deep; the acetabular margin a raised rim, not crenelate, though occasionally 
irregular in consequence of weathering (fig. 379); the base then swells slightly, again 
is slightly contracted and then passes into the smooth, prominent, rounded annulus 
the collerette is a smooth low depression between the annulus and a step where the 
shaft begins (figs. 382, 389). The rapid succession of these smooth, low rings and 
depressions explains W6urMANn’s curious description of the base as «mit concentrischen 
Rinnen bedeckt» All the structures of the base, but especially the annulus, usually 
slope from the adoral face towards the adapical in a proximal direction. This indicates 
a normal downward slope of the radiole, with exposure of its adapical face. 
The following are measurements of the base in millimetres: 
Greatest: diameter of shafts "Sy. 5.2 aes eee 2°0 31 
Total height .of hasev 2.3) =) ). hielo te OG 1:0 
Height to’ top of annulus:. .) = 4) cee OD 0°85 
Diameter of annulus) (i.e, <2 ces ad ple: 
Outer diameter of acetabular margin . . . . . O8 O6 085 
