Echinoid Radioles, Cidaris Wissmanni. 
199 
Cidaris Wissntanni var. nov. rudis. 
(Plate XII, figs. 359—366, & Plate XV, fig. 446.) 
D i a g n o s i s. C. Wissmanni in which the micro-structure of the primary radioles 
is finer and less distinct than in the type-form, the meshes of the outer layer not 
smaller towards the axis; in which the shaft of the peripheral radioles has a dia- 
meter (estimated) about 0'14 of the radiole length, and is closely set with pustules 
very irregulär in size and distribution. 
Material. — The Cassian beds of Cserhät (Leitnerhof) have yielded 155 
fragments, a few of which might prove to be the normal C. Wissmanni, or even 
other species, if it were worth while to clean them all front the closely adherent 
matrix. Four good fragments come front Giricses-domb, Lower stratified Limestone. 
Section VI near Veszprem has produced one fragment front bed e 4, and 9 very obscure 
and doubtful fragments labelled bed e. Front bed i of Section XI, Veszprent, come the 
proximal and distal ends of a radiole, possibly to be placed here. All the preceding 
seem to represent somewhat elongate radioles, peripheral or infra-ambital. There are 
also sonte shorter, rather ovoid radioles, possibly circum-apical, represented by speci- 
ntens or fragments from Section VI, one labelled bed e 4, and 6 labelled bed e. Thin 
transverse sections have been made of three characteristic specimens from Cserhät. 
Hol o type. — A radiole from Cserhät (PI. XII, fig. 359). 
A few of the more nearly complete specimens have been selected front the 
Cserhät material and cleaned so far as possible. The following account is based 
on these and on the holotype, except where otherwise stated. 
Description of Specimens from Bakony. — The ntost obvious 
feature of the more cylindrical radioles is the roughness and irregularity of the shaft. 
Not only are the pustules placed without Order, but they vary in size and shape, 
and frequently a shaft may bear a few prominent pustules and other groups of 
small ones. The general appearance of roughness is no doubt often due to the 
adherence of matrix, but this in its turn is probably due to the roughness of the 
radiole surface, and in some instances the foreign substance may in part be com- 
posed of the remains of sponges, hydrozoa and the like, parasitic on the radiole 
during life. This is notably the case with two specimens from Giricses-domb. 
The fragments are too short to enable one to base on them any satisfactory 
estimate of the length of the radiole. The longest fragment measures 15'9 mm., 
with a greatest diameter of 3'2 mm.; it is imperfect at each end, and must have come 
from a radiole at least 23 mm. long. The holotype, in which the base is preserved, 
is 15.5 mm. long, with a diameter of 2'8 mm., and must have attained a length 
of at least 20 mm. The diameters include the pustules. These estimates of length 
are much the same as those of the stouter radioles of C. Wissmanni from Cser¬ 
hät, of which the thickest had a diameter of 2‘8 mm. That thickness is often 
equalled or exceeded in this variety, the greatest diameter noted being 3'9 mm. 
(fig. 360). Of course there are fairly elongate fragments with diameters less than 
those above given, e. g. a fragment 6 mm. long from near the distal end of a 
shaft has a maximum diameter of L2 mm. On the whole, however, these radioles 
are relatively stouter than the more normal C. Wissmanni from the same locality. 
