200 
Triassic Echinoderms of Bakony. 
A distal fragment from Section XI, bed i (PL XII, fig. 361), has a length of 
12 4 mm., and a greatest diameter of 4 mm. Since the pustules are low and 
smooth, and may therefore have been worn down, the diameter including pustules 
may have really been even more. 
The account of the base in the specimens of C. Wissmanni from Bakony 
applies also to this variety. A rather large and fairly preserved base was found at 
Section XI, apparently close by the shaft-fragment just described (PI. XII, fig. 362). 
lt may, therefore, have belonged to it. The annulus, which has a diameter of 
2'9 mm., is a somewhat squarely projecting band 0'6 mm. high. It shows no 
traces of crenelation. 
The micro-structure has been studied in sections of two characteristic speci¬ 
mens from Cserhät. These proved to be rather obscure, but the essential features 
are adequately represented in (Plate XV, fig. 446). The axial complex is of loose 
composition and may in places break down into a lumen ; as in the typical C. Wiss¬ 
manni, it occupies about one fourth of the total diameter and is transversely elong- 
ate. The layer of large irregulär meshes forming the border of the complex is 
is not quite so well developed as in the normal form, and passes more suddenty 
into the outer layer composed of radiating septa. These septa dichotomise at inter- 
vals, but not to such an extent as to become closer together near the periphery. 
With their trabeculae they form a meshwork, which is more irregulär than in the 
normal form and increases in irregularity towards the periphery. Near the periphery the 
septa are about 44 to the millimetre, and about 50 nearer the centre. The structure 
is therefore finer than in the normal form where the corresponding numbers are 
37 and 32. 
Six specimens from Section VI, Veszprem, labelled bed e, and one labelled 
bed e 4, seem to represent a short ovoid form of smoother surface, which may 
have come from the circum-apical region of C. Wissmanni or of its var. rudis. 
That from bed e 4, though lacking the proximal end, appears to have had 
all the characters of var. rudis exeept length and cylindrical shape. Its length is 
5'7 mm. (slightly broken since being measured), its diameter increases from 2 to 
2'3 mm. and then lessens gradually. The pustules are intermediate between rounded 
and thornlike, and on one face tend to a transverse arrangement. 
Of the fragments labelled bed e, two are almost complete, though lacking the 
actual base. The shorter (PI. XII, figs. 363, 364) is 5'3 mm, long, slightly flattened, 
with greatest diameters 2'7 and 3'5 mm.; the diameter of the collerette may be 
estimated at 1 mm.; the shaft swells out more rapidly than it tapers to the end ; 
on one face the pustules are more prominent than on the other. The other 
specimen (PI. XII, figs. 365, 366) is of like character, 7'2 mm. long, with greatest 
diameters 2'9 and 3'3 mm., and tapering at the end rather more rapidly than does 
the former specimen ; the larger pustules tend to a longitudinal arrangement. Of 
the other fragments, three are distal ends, tapering rather rapidly, with smooth 
surface and distinct, often pointed pustules. 
This ovoid form is very distinct, but there is at present no reason why it 
should not belong to C. Wissmanni. 
