OF SOUTHERN INDIA. 
11 
On the lower side the surface of the test is not preserved in the single speci- 
men. The aperture lies rather close to the anterior end, the distance of the upper 
lip from it being two-elevenths of the total length. The anus is large, rather near 
the upper edge of the posterior flattened end. 
Locality. — Ootatoor, in a brown compact limestone ; apparently very rare. 
Formation. — Ootatoor group. 
The only knowm species to which the present form hears a close resemblance is 
from the Cenomanian beds of the Department A'onne, and is figured* by Cotteau as 
Ilemiasler Ferroni, Etallon ; it differs from the Indian fossil by a more posteriorly 
situated apex, greater height and stronger convexity of the upper surface. 
2. IIemiasteb expaxsijs, (Forhes). PI. I, Eig. 2. 
1846. Brissus expansus, Forbes, Tran.s. Gcol. Soc., Loud., VII, p. 160, pi. 19, fig. 7. 
1855. UemiasUT Id., npud d’Orbigny, Pal. Fran?, terr. cret., vol. VI, p. 266. 
1858. Periaster id., apud Desor, Synops. Ecliin. loss., p. 388. 
There is unfortunately no specimen of this remarlvahle species in our collection, 
hut when examining in 18G7 Prof. Forbes’ original, I found the specimens to 
accord with the figure and description given by Forbes, and I can, therefore, do no 
better than transcribe his notes with slight alterations. 
Hem. testa ambilK, suhorbiculari, supra modiee conrexiuscida, vertiee centrali ; 
ambulacris impressis, truncatis, antero-lateralibus lonyissimis, antico breviore, poris 
minutis instructo ; spaiio post-orali late ovato ; superficie undixpie (jranulifera, 
fasciola polyyona, dimidio postico mullo angustiore. 
Length G6 m.m., loidlh G7, greatest height 33 m.m. 
“Nearly round, or very broadly cordate, depressed by convex. The dorsal 
“ ambulacra are all petaloid and narrow, the antcro-laterals being to the posterior 
“ ones as three to two. The former have about thirty-two pairs of pores, connected 
“ by grooves, in each series ; the latter about twenty-three. The ambulacral im- 
“ pressions are flat centrally, and the lowermost pore of each pair is advanced a 
“ little towards the centre of the plane. The junction of the ambulacral plates in 
“ the centre of the depression is rather narrow and has very steep parallel sides. 
“ The anal end is very obtuse, and the truncation slopes rapidly towards the under 
“ surface.” 
The pores in the anterior ambulacrum are very small, close together in each 
pair, and about IG in number in each series ; this ambulacrum is shorter tlian 
one of the antcro-laterals. The latter diverge under an angle of 105, and the pos- 
tero-laterals under an angle of 78 degrees. The entire surface is granular, the gra- 
nules being somewhat stronger below than above. “ Tlie post-oral space is liroadly 
ovate and rather convex, l)ut the checks arc nearly flat.” 
No locality is given, but the specimens appear to be either from the calcareous 
sandstone at Pondicherry, or from near Ootatoor, belonging to the Ootatoor group. 
* Etudes sur les Echiuides fossiles du Dejit de I’Voune, jJ. 70, figs. 1 — 1. 
D 
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