420 CRETACEOUS GASTROPODA 
Casts are always attenuated in front, and show near the anterior termination of 
the last whorl a broad and shallow furrow, as usual in species of Trochacteon. 
Localities —Kolakonuttom, 8. W. of Koloture, 8. of Serdamungalum, 8. E. of 
Parchairy, near Andoor, etc.; mostly in a coarse grained, light brown, calcareous 
and siliceous sandstone; very common. 
Formation.—Ootatoor and Trichinopoly groups; the first named locality refers 
to the former group; the species is here, however, very abundant, while rather 
rare at the other localities (see Blanford’s Report, Mem. Geol. Sury., India, vol. IV, 
p. 88). z 
CII. BULLINULA, Beck, 1840. 
1. BULLINULA optustuscuLA, Stoliceka, Pl. XXVII, Fig. 14, and Pl. XXVIII, 
Fig. 25. 
Bull. testa sub-ovata, spira subturrita, sepissime irregulariter torta ; apice 
mammillato, applanato, levi; anfractibus convexis, ultimo maximo, postice inflato, 
antice attenuato ; superficie spiraliter costellata; apertura perlonga, postice acwimi- 
nata, antice producta et effusa, labro tenui, labio moderate calloso, spiram partim 
tegente, columella crassa, cortorta, antice oblique truncata. 
Spiral angle approximately 74°. 
Height of spire : total of shell ... (considered as 1:00) 000 oe §=0'24. 
Width of last whorl : height of shell ( . cp. 4) a0 or 0:62. 
The spire is in this species very remarkably formed; the apex being flattened, 
terminating in a pointed ridge; the two first whorls are inflated and quite smooth, 
the next finely spirally striated and convex, and the last whorl, which is much 
higher than the spire, is strongly inflated posteriorly and attenuated anteriorly ; 
the surface being covered with numerous, smooth ridges, only crossed by very fine, 
slightly bent striz of growth. The aperture characterizes this species as a true 
Bullinula, being pointed posteriorly, produced and effuse anteriorly; the columellar 
lip is thick, twisted, and obliquely truncate in front. 
_ The species in general form much resembles the recent Bull. Bruguieri. 
Localities.—Arrialoor, in softish sandstone; Pondicherry, in grey calcareous 
sandstone ; rare. 
Formation.—Arrialoor group. 
CIII. AVELLANA, d’Orbigny, 1842. 
1. -AVELLANA AMPLA, Stoliczka, Pl. XXVI, Fig. 8; Pl. XXVIII, Fig. 20. 
Avell. testa rotundata, globosa, spira moderate elevata; apice acuminato ; anfrac- 
tibus convexis, postice ad suturam paulo constrictis, adpressis, spiraliter striatis : 
striis tenuissimis, acutis, duabus alternatim approximatis, interstitiis transversaliter 
striolatis ; apertura lata, postice anguste subcanaliculata, antice sub-obtusa; labro 
extus moderate varicoso, prope terninationem posteriorem sub-angulato, lateraliter 
