Crinoidea, Pentacrininae. 55 
that name in the Palaeontological Museum, Munich, differ from both J. propinguus 
and J. Hercwuniae in many respects. It is enough to mention that they have no rim 
or radial triangle, but a suture-line therefore crenelate all round; side-faces concave 
or concavo-convex with raised suture-lines; a regularly elliptical cirrus-facet, not 
occupying the whole height of the nodal. 
Isocrinus Hercuniae, then, appears to be a mutation of J. propinquus, 
probably originating in Raiblian times from immigrants of that species into the 
Bakony area. 
These two species J. propinguus and I. Hercuniae are of interest because, 
though true Jsocrini, they possess in the well-marked radial triangle a feature that 
is conspicuous in Pentacrinus (s. str.), while the arrangement of the radial ridge- 
groups, as already noted, occasionally approaches that found in Balanocrinus. 
Isocrinus sp. 
Material. — A fragment of reddish rock from Vaszoly, Zalamegye, Agas- 
magas, contains numerous white fragments of a Pentacrinine stem. It is labelled 
«Muschelkalk». 
Description of the Specimens. — No joint-faces and no side-faces are 
exposed, but there are a few transverse sections, varying from sub-pentagonal to 
slightly quinquelobate. 
Diameters: 2°3 mm., 2°l mm., 1°6 mm. Height of last specimen, 1°0 mm. 
Diameter of lumen about 0°2 mm. 
Relations of the Specimens. — Of the species described in this memoir, 
Isocrinus sceptrum is that which these fragments most resemble. 
General note onthe Pentaciinine columnals from Bakony 
It is somewhat remarkable that, among the thousands of specimens collected, there 
should be scarcely a trace of anything but stem-fragments, the only exceptions 
being the single patina and the single brachial, next to be described. Even when 
the fragments have been still in the matrix, as in the specimen last described, 
I have been unable to detect anything but columnals and occasional cirrals. From 
the Quarry near Cutting I on the Veszprém-Jutas Railway there are several fragments 
of Isocrinus Hercuniae preserved in matrix. These show that the rock is largely 
composed of the remains of this crinoid; but that they are not in the position 
in which the animal grew. The stems are all in short pieces, lying in different 
directions. The extraordinary number of stem-fragments of Jsocrinus sceptrum 
suggests that they also were found in disorder close together, forming a large pro 
portion of the rock. 4 
The probable explanation of all these occurrences is that the death of the 
animals was followed by the partial decay and separation of the skeletons, and 
that the fragments were then sorted out according to relative size by the action of 
currents. Possibly a lenticle or pocket almost entirely filled with brachials of one 
or other of these species may be found some day; but, since those fragments are 
less conspicuous, such a bed is likely to be overlooked. We now proceed to the 
only two such fragments that have been found. 
