OF SOUTHERN INDIA. 198 
Locality.—In light coloured, gritty sandstone of Karapaudy in the Trichinopoly 
district ; very rare. 
Formation.—Arrialoor group. 
2. Crrirutum (FIBULA?) InauGuRATUM, Stoliczka. Pl. XV, Figs. 15, 19, 20. 
Cerith.testa elongato-conica ; anfractibus planis, spiraliter minutissime striatis, tri- 
liratis : lira posteriori juata suturam posita, lata, crassa, 12-18 tuberculis in uno circuitu 
ornata ; liris anticis duabus multo tenuioribus atque minute granulosis ; ultimo anfractu 
antice abrupte contracto; basi applanata, obsolete striata, sew levigata; apertura 
quadrangulari, antice canali brevi et lateraliter curvo terminante ; columella solida, 
biplicata, plica antica multo crassiore, postica in junioribus speciminibus obsoleta. 
Spiral angle 20°—25°; sutural angle 0°—4° 
Approximate height of last whorl : total of shell (considered as1‘00) ... ... 0:24 
Height of penultimate whorl : height of spire ( 5 6 60a) aco? Onl) 
op Bs : its width ( s * ) Sisare sess O44 
The more conical form, the angular and at the base less produced last whorl, the 
two thinner, only finely granulated, keels below a very strong one on the suture, 
ornamented with 12—18 tubercles, and the presence of at least two columellar plaits 
distinguish this species easily from Cerith. hispidulum. With respect to those 
characters, it approaches much more the Alpine-Gosau form Cerith. hispidum, Zek. 
(Abhandlg. d. Geol. Reichs-Anst., Wien, 1852, Vol. I, Pt. 2, pp. 115 and116, Pl. XXIV, 
Figs. 1, 2 and 6, 7; Stoliczka, in Sitzgb. Akad. Wien, 1865, Vol. LIT, Revision, etc., 
p- 110), but in this species only one thinner keel on each whorl and one median 
columellar fold is known. Unless it can be proved that both these forms show 
direct variations as regards these two points, they must be retained as distinct. 
The more minute striation of the shell is very sharp in well preserved specimens, 
but it becomes easily obliterated. The tubercles show on the different keels great 
variations, and those on the posterior sutural keel occupy occasionally nearly half of 
the total height of one whorl (Fig. 20), while in other cases they are not so large, but 
more pointed (vide Fig. 19). Cast-specimens exhibit clearly the angular section of 
the whorls, but the columellar folds are not so easily traceable in young shells. 
Localities—Comarapolliam, Serganoor, and Karapaudy, in soft whitish sand- 
stones ; not rare at the first named locality ; S. W. of Alundanapooram. 
Formations.—Arvrialoor and Trichinopoly groups; only the last named locality 
refers to the latter. 
