Crinoidea, Pentacrinidae. 19 
however, shows 23 crenellae, and I have counted 25 in a circular columnal of 
2:15 mm. diam. In surfaces with the larger numbers, a few of the ridges do not 
quite reach the central area, but are intercalated between the others. The ratio of 
the central area to the diameter of the columnal varies from 1:3 to 1: 1°7. The 
ridges are longer towards the distal end of the stem. In the pentagonal proximal 
portion the ridges are numerous (25 or perhaps more) and short; and, since they 
remain at right angles to the sides, the first effect is to throw them into radial 
groups; but, with increasing radial indentation of the sides, the groups become inter- 
radial, as in Jsocrinus. The essential elements are, however, the same throughout 
the stem. 
Dadocrinus ? sp. 
(Plate I, fig. 28.) 
A single entrochus from Cserhat, consisting of 2 columnals (one destroyed 
during examination), may belong to this genus. The specimen is much worn, with 
only one joint-face at all fairly preserved, and is coated with an iron-stained patina 
which obscures the suture between the two columnals. Its stereom, moreover, is more 
darkly stained than is usual in the Cserhat specimens. It is, therefore, probable that 
the fossil is derived from an older bed, possibly from one contemporaneous with 
the Muschelkalk, from which alone Dadocrinus has hitherto been recorded. 
Sides of columnals very slightly convex. 
Diameter 1 mm. 
Height of columnal 0°7 mm. 
Number of crenellae 8, with apparently a new one arising to make 9. 
The ridges are relatively coarse and have the peculiar notched appearance so 
distinct in Dadocrinus. They meet close to the lumen in a central area level with 
their tops. 
As already said, some of the small specimens (h—!/), referred doubtfully to 
Encrinus cassianus, may belong to Dadocrinus. Specimen / appears to resemble 
the present specimen, but its preservation is unsatisfactory. The joint-face of i is 
the most like that of Dadocrinus, but in the height of its columnals this specimen 
is the least like. 
Entrochus quinqueradiatus n. sp. 
(Plate I, figs. 29—34.) 
Diagnosis. — Trochitae cylindrical or barrel-shaped, smooth, and of small 
diameter (1°2—3°65 mm.). Joint-faces with 5 strong ridges, or the corresponding 
grooves, radiating from the level central area to near the periphery, and in some 
cases accompanied by bounding grooves, or the corresponding ridges. Lumen minute. 
Material. — Eight specimens from the Cassian beds of Cserhat lettered 
a—h, seem to be distinguished by the above characters, and to require a name. 
They consist of 1 (a, d, e, g, h), 2 (b, f), or 3 (c) trochitae each. Specimen d is 
selected as holotype. 
Description of the specimens. — The appearances of the joint-faces 
may be explained thus: — In the simplest form are 5 ridges (shown in a, g, h), 
Q* 
