_ Echinoid Tests. Cidaroida. 79 
mentioned as lying at the upper and lower margins, and an occasional faint suggestion 
of radiating folds or ridges. 
Relations of the Specimens. — There is nothing to prove that these 
plates belong to a Triadocidaris; indeed they do not resemble characteristic plates 
of any Cidaroid. The tubercle, however, is so much like that of Triadocidaris 
praeternobilis, that these plates might come from the adoral region of an individual 
of that species. 
Triadocidaris cf. subnobilis ? 
Material. — A fragment consisting of portions of three interambulacrals, much 
weathered as well as obscured by tenacious matrix, from the Raiblian Bed g at 
Cutting IV on the Veszprém-Jutas Railroad. 
Description of the Specimen. — Two main tubercles are exposed, the 
third being hidden by matrix. The mamelon is perforate, relatively small, 0.7 mm. 
diameter, on a rather broad platform 1.6 mm. diameter, with apparently a slight 
parapet. From this the bosses slope rather steeply with a concave curve. Scrobic- 
ules very slightly, if at all, sunk, elliptical with meridional diameter 3.2 mm, 
confluent; scrobicular ring probably not strongly marked. Several small mamelonate 
tubercles are visible. 
Relations of the Specimen..—- This, when collected by Prof. Laczk6, was 
labelled by him <Cidaris cf. .subnobilis Miinst.», and so [| have left it; but it is quite 
as likely to be 7. praeternobilis. 
Triadocidaris immunita' n. sp. 
(Plate VI. figs. 141—149.) 
Diagnosis. — A Triadocidaris with test (probably) depressed; each interamb- 
ulacral column contains numerous (certainly more than 8) plates, of which the width 
being taken as 100, the height is from 72 to 50;” scrobicules indefinite, non-con- 
fluent, but those near the poles are usually contiguous and transversely elliptical, and 
all are flush or very feebly sunk; distance from centre of tubercle to adradial margin 
from 37 to 50; approximate diameter of boss from 37 to 31; diameter of mamelon 
from 20 to 14; platform distinctly wider, flat, or with very slight parapet; no scrob- 
icular ring; extra-scrobicular surface crowded with miliaries of two sizes, which 
tend to radiate from the tubercle. Transverse sutures of interambulacrals slightly 
grooved or bevelled, but non-imbricate. About 11 ambulacrals to each ambital inter- 
ambulacral. 
Material. — (a) Holotype, adoral portion of an interambulacrum (figs. 141—143); 
() a similar, but less complete fragment, marked in ink «IX, 63» (figs. 147—149); 
(c) an isolated interambulacrel, large and almost complete; (d) a smaller fragmentary plate, 
referred here with some doubt; (e) two interambulacrals, firmly united in meridional 
series (figs. 144—146); (f) two interambulacrals and part of third, similarly united: 
all these come from the Raiblian beds of Jeruzsalemhegy. (g) An interambulacral, 
closely resembling c, from the Raiblian beds a—b of Cutting IV on the Veszprem— 
Jutas railroad. 
1 Un/ortified, i. e. with no scrobicular circle or ring. 
* In each of these measurements the former is the more adoral. 
