178 
Triassic Echinoderms of Bakony. 
radiole, but the shaft shows clearer traces of the original dorso-ventral differentiation 
than does the poculiform radiole d from Cutting I. 
Relations of the Mutation. — As previously explained, this is regarded 
as the last term at present known in the alata series, and that series is supposed 
to have developed parallel to the dorsata series. On this view one can understand 
why, at any stage, there should be a difficulty in distinguishing the least modified 
or infra-ambital, and the most modified or adapical, radioles of the 6. alata series 
from the corresponding radioles in the C. dorsata series. The distinction between 
the normal peripheral radioles will be made clear in the description of C. dorsata. 
The poculiform radioles with their expanded excavate ends, truncate at right 
angles to the axis, afford a far truer subject for comparison with the adapical 
radioles of Goniocidaris clypeata than do the paletiform radioles of Anaulacidaris 
Bucht. Indeed figures 17 and 18 on Taf. vi of Doederlein (1887) might almost 
pass for representations of the radioles described above, so far as mere form is 
concerned. When Doederlein wrote, the Triassic rocks had yielded no radiole with 
an «Endkrone», and these from Bakony are the first of that age to be described. 
1t is also interesting to note the intensification of the pustules into fiattened 
spinelets in this mutation, and to compare it with the flattening of the lateral 
spinelets in the radioles of Goniocidaris clypeata and G. mikado, to which Doederlein 
( p. 34) drew special attention. 
The recent Japanese species with adapical radioles resembling those of C. alata 
poculiformis were dredged in Sagami Bay, on a muddy bottom, at a depth of 
120—160 fathoms. 
« Cidaris » dorsata. 
1841. Cidaris dorsata (ex Bronn Ms.) Münster : Beitr. z. Petrefactenk. IV, p. 46, pl. iv, f. 1 a —/ 
1855. Cidaris dorsata Braun in Münster, E. Desor, Mars: Synops. Ech. foss. p. 19, pl. ii, f. 4. 
1863. Radiolus dorsatus Münst., H. E. Beyrich : Monatsber. preuss. Akad. Wiss. Berlin, Jahrg. 
1862, p. 30. 
1865. Cidaris dorsata Braun, G. C. Laube : Denkschr. Akad. Wiss. Wien, Math.-Nat. CI. XXIV, Abth. 2 
p. 283, pl. ix, f. 12. 
1875. Radiolus dorsatus Münst, F. A. Quenstedt : Petrefactenk. Deutschlands, III. p. 193, pl. Ixviii, 
ff. 66—78 ; excl. C. Hausmanni, which, however, does not appear to be represented by any 
of Quenstldt’s figures. 
1875. Cidaris foratus F. A. Quenstedt: tom. cit., p. 195, pl. Ixviii, ff. 79—81. 
1889. Cidaris dorsata Braun, S. v. Wöhrmann: Jahrb. Geol. Reichsanst. Wien, XXXIX, p. 193, pl. v, 
f. 12. Including synonyms, except perhaps C. gigantea Corxalia. 
1889. Cidaris Braunii Desor, S. v. ^Wöhrmann, pars, loc. cit. pl. v, f. 14 non f. 13. 
The ascription of this species to Braun, by Desor, Laube, and others, is an 
error. Agassiz & Desor (1847, Catal. raisonnee, p. 27) even went so far as tö 
maintain «Cidaris dorsata Braun in Münster» and to make «Cidarites dorsatus 
Bronn» a synonym of C. alata. The two are the same species, and the proper way 
of quoting it is shown in the first entry above. Proof of this Statement is afforded 
by the citation « Cidaris dorsata Bronn» in the footnote signed by Braun on p. 16 of 
Münster’s «Beiträge» IV, and by the entry « Cidaris dorsata Br. mss.; i. Mü. 
Beitr. &c.» in Bronn’s «Nomenclator», 1848. 
Diagnosis. — A Cidaroid in which the radioles have an irregulär micro- 
structure, with no distinct axial complex, radiate septa of inner layer irregularly 
