OF SOUTHERN INDIA. 227 
12. TURRITELLA (ZARIA) VENTRICOSA, Forbes, Pl. XVII, Fig. 15, and Pl. XIX, 
Figs. 22-23. 
1846. Zurr. ventricosa, Forbes, Trans. Geol. Soc., Lond., Vol. VII, p. 123, Pl. XIII, Fig. 3. 
Turr. testa conica, brevi ; anfractibus convexis, suturis profundis sejunctis, 3-6— 
liratis ; liris levigatis, mediis maxime prominentibus, acutis ; striis incrementi minutis ; 
basi convexa, 3-5—lirata ; apertura rotundate ovata. — 
Spiral angle 30°- 35°; sutural angle 10°. 
Height of last whorl -: total of shell (considered as 1:00) pee 500 COBY, 
Height of penultimate whorl : height of spire (considered as 1:00) .., 0°27. 
iD < | on 3 : its width ( 3 op) cog. AUnaKOE 
The short spire, greater convexity of the whorls and a larger spiral angle 
distinguish this species readily from 7. muitistriata. In young specimens there are 
often only three spiral ridges, as in the last named species, but they are always 
much closer to each otherand sharper. On the succeeding whorls there are very soon 
traceable two additional ridges, one along each suture; and towards the last volu- 
tion a sixth one appears along the anterior margin, while the posterior margin is 
only somewhat more thickened, without forming a distinct ridge. The last whorl is 
evenly rounded, and the basis is provided with three to five ridges, the outer one 
being stronger than those nearer the centre. The striz of growth obtain, only on 
the last volution generally, a somewhat greater strength, so as to produce a fine 
cancellation between the ridges; they are as usual insinuated. The aperture is 
roundish oval, the outer lip being somewhat produced anteriorly. 
Locality—In the white, sandy limestones at Ninnyoor, where the species does 
not appear to be rare, occurring with Turr. elicita, n. sp. Nerinea Blanfordiana, 
n. sp., and others. 
Formation.—Arrialoor group. 
13. TURRITELLA (ZaRiA) Breantiana, D’Orbigny, Pl. XVII, Figs. 2-6. 
1846. Turritella monilifera, Forbes, (non Desh.) Trans. Geol. Soc., Lond., VII, p. 123, Pl. XIII, Fig. 2. 
1847. - Breantiana et simplex, D’Orb., Voy. d’Astrol. Atl. Paléont., Pl. IT, Figs. 36-37, and 
Pl. III, Fig. 26. 
1850. Ss Breantiana et subsimplex, D’Orb. Prod. II, p. 218. 
Turr. testa elongate conica; anfractibus numerosis, convexis, suturis profundis 
sejunctis, tribus liris sub-granulosis ornatis : lira mediana ceteris sepe fortiori, aper- 
turam versus omnibus seu nonnullis evanescentibus ; striis incrementi minutissimis, 
valde insinuatis ; basi convexa, sub-levigata, ad peripheriam obsolete carinata. 
Spiral angle 22°- 24°; sutural angle 8°. 
Height of last whorl : total of shell (considered as 1:00) cco oc . EAS 
Height of penultimate whorl : height of spire (considered as 1:00) ... 0°20. 
” ” ” ” : its width ( ” cry) ) tee 0°61. 
The three sharp keels, placed at equal distances on the space of the whorls, 
are very characteristic of this species. The sutures are always very deep, and 
the median convexity increases in proportion, as the strength of the keels or 
ridges lessens. The tuberculations of the keels are never very strong, sometimes 
