| 90 : = ______ Triassic Echinoderms of Bakony. 
surface striae; but on the pustules they swell out to a thickness of only 40 to 
the millimetre. 
In the section figured, the stereom-strands of the axial complex seem chiefly 
to lie parallel to the transversal plane. This fact, though at present isolated, when 
considered in connection with the greater persistence of the lateral rows of pustules, 
suggests a fundamental and primitive bilateral symmetry. Some small elongate 
radioles, apparently belonging to C. alata, are in fact very like some of the more 
compressed C. similis. 
The bilateral form is perhaps best retained in such a variety of C. similis 
as that to which Kuipstein (1848) gave the name C. bispinosa. This name, being 
preoccupied by Derrance (1817), was changed to C. subbispinosa by A. dOrpicny 
(1849). The form was retained as an independent species by Drsor (1855), but was 
made by Lause (1865, p. 291) a synonym of C. Wissmanni, with the remark that. 
the species was founded «auf ein schlechtes Bruchstiick». Lauber presumably never 
saw the fragment, which Kurpstein described as <h6chst niedliche». Lause’s action 
was followed by Brom (1904, p. 156). The holotype cannot be traced in the 
British Museum, and, since it was not mentioned in Kurpstein’s Ms. list of his 
collection as sold to the Trustees, it had probably been lost before the collection 
was received. It is, however, clear from Kurpstemn’s description that the shaft was 
dorso-ventrally compressed, with two longitudinal rows of thorn-like pustules on 
each side, as represented in Kutpstein’s f. 120 (incorrectly taken by Drsor to show 
the upper, i. e. adapical, face); and that the flattened faces were covered with a 
fine, scarcely visible, longitudinal striation. These features agree so much better 
with C. similis than with C. Wissmanni that it seems more reasonable to regard 
C. bispinosa as an individual variation of the former species. In the absence of 
the holotype, however, it is safer to suspend a decisive judgment, especially as 
that decision would result in the name Cidaris similis giving way to C. sub- 
bispinosa. 
An even more markedly bilateral form was found in the Geologische Reichs- 
anstalt, Wien, among a number of radioles labelled C. Wissmanni, and has since 
been presented to the British Museum (E 4700). It is a fragment of shaft 8 mm. 
long, with diameters 1°9 mm. and 1°2 mm. On one side is a row of 5 pustules, 
on the other side a row of 3. The rest of the surface is covered with a fine 
striation. 
Brom (1904) says that Cidaris similis, which he regards as only a thin 
variety of. C. Braunii (i. e. Waechteri), occurs in the Pachycardientuffe of the 
Seiser Alp. I do not recall the specimens, but his figures 27 and 29 have not the 
regular appearance characteristic of C. similis: the pustules in his f. 27a are quite 
irregular. 
In spite of the difficulty in deciding from their external form whether certain 
radioles should be referred to C. similis, C. Waechteri, or even to C. Wissmanni, 
it is not so hard to discriminate between the normal Cassian radioles; and the 
micro-structure observed in specimens referred on general grounds to C. similis is 
so distinct that there can be no doubt of their specific independence. Probably the 
true C. similis did not persist into Raiblian times, 
Material from Bakony. — Cserhat (Leitnerhof) yields two proximal 
ends of radioles. From bed e 4 at Section VI, Veszprém, come three fragments, 
