202 CRETACEOUS GASTROPODA 
very broad, the spiral ridges close to each other and more numerous. Geinitz’s des- 
cription is not clear on these points. Iam unable to refer to Woodward’s Geology 
of Norfolk, which Prof. Reuss quotes, but I cannot find that name of Sowerby in 
D’Orbigny’s, Bronn’s, or Morris’ catalogues. 
Localities.—Near Alundanapooram, in blueish calcareous and shelly sandstones ; 
the species is rare, but it occurs oftener near Arrialoor and Comarapolliam in 
whitish soft sandstones. From a similar sandstone there are two specimens 
labelled in the Madras Museum as from Pondicherry ; if so, they must have been 
got there from the upper or Arrialoor beds, pointed out by Mr. H. Blanford. 
Formations.—Trichinopoly and Arrialoor groups; to the former the first named 
locality refers. 
13. CERITHIUM (SANDBERGERIA) ANTECEDENS, Séoliczka. Pl. XVI, Fig. 5, and 
Pl. XIX, Fig. 4. 
Cerith. testa turrita; anfractibus denis seu duodenis, convexis, transversaliter ob- 
solete costulatis spiraliter liratis: liris mediantis tenuioribus alternantibus.atque omnimis 
im costulis transversalibus spinulosis sew subtuberculatis ; apertura ovate-rotundata, 
antice paulo producta atque late effusa, marginibus integris, parum dilatatis, mtus 
levigatis ; labro extus varicoso. 
Spiral angle 40°—42° ; sutural angle 4°—5° 
Height of last whorl : total of shell (considered as 1:00) ... .. 0:40 
» of penultimate whorl : height of spire (considered as 1:00) 0:30 
y o3 ” 3 : its width (considered as 1°00)... we 048 
The transverse ribs are always very thin, and often only apparent through the 
fine tubercles, which are formed by the spiral striz. Of the latter six are generally 
stronger, and except those running along either of the sutures the others alternate 
with finer strize. Those on the greatest convexity of the whorls are, generally speak- 
ing, the strongest. The margins of the aperture are united posteriorly, somewhat 
expanded, internally smooth; and the outer lip is externally varicose. A second. 
varix is occasionally preserved in larger grown specimens, and placed at about two- 
thirds the distance of the volution from the aperture. On the place of the anterior 
canal the margins are only somewhat produced and form a broadly effuse channel. 
An allied species is Cerith. Lallierianwm, D. Orb. (Pal. France. crét. II, Pl. 229, 
Figs. 7-9), which differs merely by stronger transversal ribbings, somewhat more 
numerous spiral strize and more produced anterior canal. Forms very similar to the 
Indian fossil are to be found among living American and Indian species of Cerithidea, 
like OC. Mazatlanica, Carp., C. Wérchii, Adams, C.iostoma, Pfeiff., and others (vide 
Reeve, Conch. Icon., Monog. of Cerithidea, 1866); we have, however, already 
referred to the probable distinctions between Sandbergeria and Cerithidea. 
Localities—Karapaudy, N. E. of Shillagoody, and east of Andoor, in soft 
conglomeratic sandstones. 
Hormation.—Arrialoor group. 
