a 
Triassic Echinoderms of Bakony. 
Comparison of Striation and Lumen. 
Striae 
to 1 mm. Lumen ~ 
C. flexuosa, specimen figd. Kurpstem [B. M. 36510]. . 12 large 
C. linearis, specimen figd. Kustem [B. M. 36511]. . 20 large 
C. linearis, Kurstew Colln. 686 [B. M. E4683] . . . 18 medium sized 
C. Meyeri, holotype [B. M. 36496a@] . . . ... . 24 small 
C. Schwageri, holotype [Pal. Mus. Miinchen] . . . . 14—I16 apparently small 
R. lineola major, thin section from Jeruzsalemhegy. . 24—28 rather large 
R. lineola minor, thin section from Quarry near Cutting 1 16—18 rather small 
By «large» is meant a lumen more than half the diameter of the shaft; by 
«small» is meant a lumen less than one-quarter the diameter of the shaft. 
Radiolus lineola n. sp. 
Diagnosis. — Radioles with elongate shaft, cylindrical, or compressed 
dorso-ventrally, or bicarinate; with medium-sized axial lumen, surrounded by a 
dense layer of exceedingly fine, waving and inosculating septa, which, as they 
radiate to the periphery, thicken and become regular; with surface usually plain, 
but sometimes bearing small irregularly placed pustules, and always marked by fine 
longitudinal striae (30—82 to 1 mm.), broken into pits by the interseptal trabeculae; 
the same striae pass over the collerette, which may or may not be separated from 
the shaft by either a ridge or a depression, and is usually wider than the shaft at 
its proximal end; annulus still further projecting, marked by striae and obscure 
crenellae; base conical-truncate, or with concave sides; acetabular margin a coarsely 
crenelate projecting ring. 
Owing to the fragmentary nature of the material, proportional measurements 
cannot be given. 
Holotype, the original of Pl. XIII, fig. 420, from the Raiblian of Jeruzsalem- 
hegy; this is also the holotype of var. major. The species occurs in rocks of both 
Raiblian and Cassian age, at the localities mentioned under the varieties. 
Description of Specimens. — As stated above, the radioles assigned 
to this species fall into two groups according to size, and bearing no obvious 
relation to either locality or horizon, though the larger ones have not yet been 
found in beds of Cassian age. 
The number of specimens of the larger size is not enough to permit of the 
construction of graphic curves; still there is hardly reason to doubt the distinctness 
of the group. Taking the specimens associated at a single locality, e. g. Jeruzsalem- 
hegy, we find that, out of 102 radioles, 24 have an average diameter of 2°55 mm., 
being almost equally distributed on either side of this number between the limits 
1°85 mm. and 3°45 mm., of which the mean is 2°65 mm. The remainder have an 
. average diameter of 1°04 mm., being unequally distributed so that three-quarters of 
them lie at or below 1°05 mm., between the limits 065 mm. and 169 mm., of 
which the mean is 117mm. Of these, 15 are bicarinate; and if they be elimin- 
ated, the average becomes 0°96 mm. and the mean also 0°96 mm. Even with 
