' OF SOUTHEFN INDIA. 
23 
2. CAKDiASTEa iiEauLARis, Sluliczka. PI. IV, Figs. 3 — I. 
Card, testa amhitu regularlter cordato, depresse convexmscida, ad periplieriam 
suhrotimdata, apice suhcentrali ; snlco antcriori gradatim profundiore, ^ltrinq^^e 
angulato, regione centrall post-apicali paulo elemla, convexiuscula, declivi, postice 
fere verticalitcr trancata ; aperlura immersa, area post-orali elongata, convexa ; 
superfcie %na>qualiter gramdata, ad angulos sulci anterioris tuhercidata ; apice 
elongate, suh-tnbercnlifero ; amlndacris antero lateralihus valde (140°) dicergentibus, 
p>osticis app)roximatis, poris seriem anlicam cuj usque ambulacri lateralis coniponen- 
tibus Us seriem posticam formantibus minor ibns. 
The very regular cordate shape of this species, with its slight upper convexity 
and rounded i)eriphery, readily distinguish it from any other known one. From the 
last species it also differs hy a somewhat more elongate or extended apical disc, hcliind 
which there is a low crest running in an easy curve to the anal end, whicli appears 
in a side view somewhat hent downwards, as are also the antcro-latcral lohes. The 
post-oral area is elongate and very distinctly convex. The anterior amhulacral 
furrow gradually increases in width and depth, until near the periphery it rapidly 
descends to the mouth. The pores in the anterior zones of the ambulacra are 
conspicuously smaller than those of the posterior. 
Bc'sides the typical larger specimen, there is another from the same locality, 
very similar in form and in the distribution of tlie ambulacra, hut the anterior 
furrow has the lateral angular edges much loss distinct ; this, however, may he 
accounted for hy the specimen having the entire surface very much worn off. 
None of the specimens shew the extent of the lateral fasciole. 
Localitg. — Near Karapaudy, in coarse sandstone. 
Formation . — Arrialoor group. 
IV. Genus. — IIOLASTER, Agass., 183G. 
Desoi-, Synop. Eebiiiid. foss., p. 330. 
Test cordiform, with the anterior amhulacral sulcus generally shallow and 
broad, not distinctly angulatcd at the sides ; the other ambulacra not impressed, 
scarcely pctaloid ; pores equal or more often unequal, and poriferous zones extending 
to the periphery; apical apparatus elongate, with four genital and five ocular 
perforated plates ; apertewe transversely ovate ; anus near the posterior upper end ; 
surface unequally granular above, more or less coarsely tubercular below; no 
fascioles are present. 
The genus is almost confined to tlie cretaceous deposits. Forbes described one 
species from the beds near Pondicherry in Trans. Geol. Soc. of London, vol. VII, 
p. 159, pi. xix, fig. 4 ; there are three specimens of it in the Geological Society’s 
collections, but unfortunately none in our Museum. I, therefore, give copies of 
Prof. Forbes’ account of the species and of his two figures. 
G 
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