132 
Triassic Echinoderms of Bakony 
Outer surface (fig. 227) narrow (not so much as b), convex. Length 8'3 mm.; 
greatest width, just belovv fovea arcualis, 2’8 mm. External outer margin thickened, 
especially towards the ends. Admedian outer plane smooth, about 09 mm. wide. 
Fovea magna externa narrow, more deeply excavate than in b, and without the 
convexity obvious in that specimen ; the sulci consequently are not so well defined. 
The upper end of the outer admedian plane is cut off obliquely by the boundary of 
the supra-alveolar process, which forms a slight re-entrant angle. 
Symphysial face very narrow, broadening below to 0‘5 mm. at the widest 
point. Length of symphysis 7‘7 mm., the full height of the hemi-pyramid being 
8'3 mm. The union therefore is through 0‘92 of the whole length. 
The internal face (fig. 228) shows a rather wide central canal, coming to an 
end where the symphysis widens. Lineae eminentes strongly pronounced. The 
dental slide appears to be marked in its lower half by three slight furrows. As 
these die out above, it appears convex rather than concave. Styloid process rounded 
but clear. Above it the sulcus and ridge, as seen in b, are not clearly defined. 
The differences observable in almost every detail show that this cannot belong 
to the same species as b. 
yeruzsdlemhegy (e). 
A left maxilla with adoral end broken off. Raiblian. 
Interpyramidal joint-face narrow (?), but, being broken and worn on the 
oesophageal border, its greatest width cannot be given. For the same reason the 
slope of the aboral margin cannot be distinguished. The transverse ridges slope rather 
sharply downwards and inwards, with a slight curve, convex downwards, in their 
outer half; 6 ot* 7 to l'Omm. Fossa arcualis apparently somewhat weathered; at 
least 1‘2 mm. wide at base of supra-alveolar process, which is 2'7 mm. high. 
Outer surface resembles that of d, but is not quite so convex, and external 
margin not quite so thick. 
Symphysial face very narrow, broadening below. 
Internal face as in d, except that the dental slide appears simply concave 
below, not furrowed. 
Probably this specimen belongs to the same species, though not to the same 
individual, as d. 
Vesrjp rem-Jn tas Ry., Cutting I. (a) 
(Plate IX, figs. 229—231.) 
A left maxilla, from bed e. Raiblian. 
Interpyramidal joint-face (fig 229) 7 - 2 mm. high, 3'3 wide at widest part, 
where, however, it appears to have lost the oesophageal margin. The aboral margin, 
which for the same reason is incomplete, seems to have sloped downwards and 
outwards. The transverse ridges are too much worn for description. The fossa 
arcualis seems to have been narrow, while the supra-alveolar process rises 
2‘7 mm. above it. 
The outer surface (fig. 230) is narrow, with slight convexity. Length 9'6 mm.; 
greatest width 2'5 mm. External margin sharp. The admedian outer plane is smooth 
