OF SOUTHERN INDIA. 
27 
but appear to bo nearly equal ; the anus is vertically elongated, ovate ; it lies at the 
posterior end, on about the level of the middle height of the tost. 
The aperture is very much anterior from tlio centre ; it appears to he irregularly 
pentagonal, slightly broader than long ; hut, as the superficial part of the shell is 
entirely removed, it is not seen ■whether any lobes were presenter not. On the upper 
side the entire surface of tlie test is also very much worn off, and hence the difficulty 
in characterising the species, but its form is so -well marked that it will ho compara- 
tively easy to recognize it, should any better specimen bo found in future. 
Locedity . — In a 'wbitish calcareous sandstone near iVrrialoor. 
Formation . — Arrialoor group. 
VII. STIGMATOPYGUS, F'OrhUjny, 1855. 
Pal. Fian5. terr. cret., vol. vi, p. 3*31. — Desor, Synop. Ecliinid, foss., p. 290. 
Test of moderate size, ovate in circumference, hcmispberical, lower side flat, 
mouth nearly central, irregularly five-sided, surrounded hy five elongated, buccal, 
tubercles, alternating with smaller ones, which are superseded by very distinct 
phyllodia ; apex subcentral ; madreporiform plate large, porose, but not provided 
with a large pore like the other three genital plates ; ambulacra petaloid, of 
moderate length, the outer row of pores in each zone elongate, groove-like ; 
anus vertically elongately ovate, situated at the upper end of a long bottle-shaped 
depression ; upper surface finely, equally granular, lower with coarse mammillated 
tubercles, except along the entire median length, this being only finely granular. 
As remarked by D’Orbigny, this genus is closely allied to Casskhdus, although 
the above noted characteristic somewhat differs from that recorded by tbe celebrated 
French author. The position, of the anus is in both genera very much the same, 
at the upper end of a longitudinal depression in the test, while the principal differ- 
ence lies in the form of the apical disc and the composition of the petala. In 
this character the genus agrees with Fcliinantluis, differing from it, however, by the 
position of tbe anus. 
D’Orbigny, when framing his characteristic of the genus, evidently regarded 
the Indian fossil as the type of it, but he also referred to the same a European 
species under the name of St. yaleatns. Desor (Synop., p. 288) places the species 
in Rhynchoiyyyns, but, strictly speaking, it does not agree much better with that 
genus than with the present one. It would be useless to speculate on the generic 
determination of St. galeatus, until we know whether the size and form of the 
anus is strictly correct, and not misrepresented, as it certainly had been in the Indian 
species ; besides this it is necessary to know the character of the granular structure 
of the lower surface. 
The only other species which Desor (1. cit., p. 297) admits in Stigmatojiygns is 
Nncleolites analis, Sorign., which specific name, although coupled Avith a different 
generic one, is quite unnecessarily changed by Desor into Bervillei. 
H 
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