48 
Triassic Echinoderms of Bakony. 
Isocrinus Hercuniae * n. sp. 
(Plate IV. figs. 103—112, Plate V., figs. 113—117.) 
Diagnosis. — Transverse section varies from pentagonal, through stellate 
and concavistellate, to quinquelobate with shallow re-entrant angles; the lobation is 
greater in columnals just above the nodes; in a few the section departs from concavi¬ 
stellate by a slight radial convexity. Diameter observed to ränge from 2‘5 mm. to 
7'2 mm. Diameter being taken as 100, height of internodals is from 32 to 13; mean 
of extremes 22 5; average of 20 specimens, 21. Nodals nearly half as high again 
as internodals, and hypozygals slightly higher than adjacent internodals. Side-faces 
smooth, slightly convex or, in basaltiform columns, almost straight; nodals not 
swollen. Suture-lines depressed, especially in re-entrant angles, where is a cavity; 
crenelate only at interradial angles, and that obscurely. Internodes long (as many 
as 14 internodals observed). 
Joint-faces. Normal: lumen minute, subcircular; central area raised, usually 
smooth, merging into perradial crenellae; petal-floors sunk, smooth or granulate, 
lozenge-shaped to lanceolate, with short diameter at half the distance or nearer the 
centre; radial ridge-groups vary from crenellae, which inosculate or meet gablewise, 
to granules, which become regulär and may fuse into two ridges radially disposed, 
or into a series of ridges at right angles to the radius, or into reversed gables; 
peripheral crenellae vary in length inversely as the radial excavation, Vary in number 
from 6 to 15 according to size of columnal and depth of radial excavation, sub- 
confluent, diverge from interradius either parallel or fan-wise; a marginal rebate 
broadening into a radial triangle with obtuse apical angles and with base often 
raised perradially into a lip. Syzygial: as usually seen, resemble normal joint-faces 
with the sculpture less accentuated; but in some (perhaps all if well preserved) 
the original sculpture is overlaid by a fresh series of very fine crenellae all round 
each petal; epizygal radial triangle reduced or absent, petal-floors sunk as usual; 
hypozygal petal-floors gently swollen. 
Cirrus-facet occupies whole height of nodal, sometimes indenting hypozygal 
and supranodal, about fiush, directed very slightly upwards; transversely elliptical 
with well-defined rim, tending to be flattened below and somewhat compressed 
at ends; fulcrum well above centre, swollen at ends and around lumen, and 
sometimes grooved. 
Material. — This species is abundant and widely dispersed within the Veszprem 
district. The greater part of the material, over 400 stem-fragments, with some 
pieces in matrix, contes from the quarry near Cutting I on the Veszprem-Jutas 
Railway. The 14 specimens figured, lettered a — o, are all from this locality. There 
are also 8 fragments, of which the bed is not stated, from Cutting I; 2 fragments 
from bed e, Cutting I; and 47 fragments from Jeruzsälemhegy. From Cserhät 
(Leitnerhof) there coine a nodal, with three of its cirrus-facets worn off, and two 
internodals, apparently rolled; but these specimens are doubtful. One ill-preserved 
columnal occurs in a small piece of limestone from Kökepalja near Veszprem, 
Cutting VII, bed d 1, while a similar specimen is labelled «Veszprem, Lanczi». 
Specimen a (figs. 102, 103), from the quarry near Cutting I, is taken as holotype. 
* Hercunia. the ancient name of Bakony. 
