qn 
; Echinoid Radioles, Cidaris alata. 1 
dorso-ventrally compressed, the compression being greatest in the peripheral radioles 
which have slight lateral vanes (alae) separating a more pustulate adapical face of 
the blade from a smoother adoral face. Collerette short, with fine longitudinal striae. 
Type-description: Acassiz, 1840, Nouv. Mém. Soc. Helvet. IV, p. 74. 
Type-figures: tom. cit. pl. xxi a, ff. 5 a, b. 
Type-locality: Buchenstein in Ampezzo district, Tyrol. 
Lectotype: following Drsor, 1885, I take the original of Acassiz’ cast 
X 23 (Pl. XI, fig. 273), said to be in the Berne Museum. 
This is divided into three sub-species, probably to be regarded as mutations. 
«Cidaris» alata typica. 
(Plate XI, figs. 273, 274.) 
Diagnosis. — _ C. alata in which the peripheral radioles are sub-claviform 
or sub-baculiform, with vanes very slightly developed, pustules subequal on ad- 
apical and adoral faces, of relatively moderate size and irregularly disposed; with 
long axis slightly or not at all bent. 
Type-description, type-figures, type-locality, andlectotype, 
same as for the species. 
Material from Bakony. — Perhaps to this form should be assigned 
two radioles from the Cassian beds of Cserhat (Leitnerhof) lettered a & b. These 
are flattened, but with no vanes; the adapical face bears the coarser granules 
(fig. 274). 
«Cidaris» alata subalata vp’ Ors. 
(Plate XI, figs. 275—279, and Plate, XIV, fig. 440.) 
Diagnosis. — OC. alata in which the peripheral radioles have the blade 
clearly compressed; with distinct vanes or side-keels, which may meet proximally 
on the adapical face; with pustules of adoral face usually in longitudinal rows and 
tending to form longitudinal ridges distally; with coarser pustules on adapical face, 
displaying a frequent tendency to lie in rows; with longitudinal axis of blade bent 
more adorally than that of the handle. 
Ty pe-description: Munster 1841, loc. cit. supra. 
Type-figures: Munster 1841, pl. iv, f. 2. 
Type-locality: St. Cassian. 
Lectotype: the original of Munster 1841, pl. iv, f. 2c. 
., Material from Bakony. — Three radioles from the Cassian beds of 
Cserhat (Leitnerhof), lettered c to e, and one from Section XI, bed 7, lettered a, 
seem appropriately placed under this form. 
The chief specimen from Cserhat (c) is a peripheral radiole (figs. 275, 276), 
devoid of base, 162 mm. long, approaching cylindrical, with slight but distinct 
vanes; its adoral face bears a fine shagreen ornament, with a slight tendency to 
run in longitudinal rows; its adapical face bears ornament more pronounced and 
more linear: the distal end is rounded and bears coarser pustules. 
The two other radioles from Cserhat (d & e) are obscure. In both of them 
the ornament is markedly linear (fig. 277). 
