OF SOUTHERN INDIA. Aq 
tions in his Report on the cretaceous deposits of Trichinopoly and South Arcot— 
Mem. Geol., Surv. India, Vol. IV, Pt. I. p. 140—‘two or three’ species of Ovulum 
and repeatedly in other places quotes the name of the same genus. He undoubtedly 
adopted here D’Orbigny’s views, thinking that the Cypree described by Prof. 
Forbes had been correctly re-determined by him as Ovule. In this, however, Mr. 
D’°Orbigny was totally misled, as I shall have occasion to prove hereafter, affirming 
Prof. Forbes’ determinations. 
1. Ovuta AntTiqguata, D’ Orb. Pl. IV, Fig. 1. 
1847. Ovula antiquata, D’Orbigny, Voy. Astrolabe et Zélée, Paléont, Pl. IV, Figs. 4—6. Z 
1850. Fr Fe x) in Prod. II., p. 225 non Cyp. Cunliffei, Forb,—Ovula idem, Gabb, Pictet, ete. 
Ov. testa pyriformi, postice truncate rotundata, antice attenuata, depressa, invo- 
luta, levi atque polita; apertura angusta, antice latiore atque vix emarginata; labro 
inflexo, arcuate expanso, margine in medio latissimo, ad extremitates gr adatine 
angustiore, trtus obsolete denticulato. : 
The pear-shaped form, being dorso-ventrally somewhat depressed, the curved 
and in the middle thickened outerlip, and a scarcely perceptible notch at the anterior 
termination, form the chief characters of this interesting species. The aperture is 
narrow and widens considerably in the anterior portion. The outerlip is inflexed 
and becomes much thinner towards each end; the dentition on this is so fine, that it 
is hardly perceptible. The posterior canal is scarcely marked, the outer lip being only 
on its posterior termination considerably thinner, although still thicker than in the 
corresponding place on the anterior extremity; both terminations are very slightly 
notched. A comparison of our figure with that of D’Orbigny (loc. cit.) will, we 
think, place the identity of the two beyond doubt. Forbes’ figure of Cyprea Cunliffei 
(loc. cit.) is certainly not very clear, but it could scarcely be confounded with the 
former, as it is evidently far less wide and more cylindrical in its total aspect. 
Locality —S. EB. of Arrialoor in the Trichinopoly district, where the single 
figured specimen was obtained. -D’Orbigny procured his specimen at Pondicherry ; it 
is, however, a question, from where it was brought to that place, although Arrialoor 
beds occur not far off. 
Formation.—Arrialoor group. 
e. Sub-family—CYPRMINA (CYPRAIDA, H. and A. Adams.) 
The species belonging to this sub-family consist of shells, which are either in all 
stages of growth convolute, or only and usually in the first period of their age, becoming 
afterwards involute, through a stronger development of the last whorls. The involution 
is, however, often caused merely externally by a large secretion of enamel coating, 
apart from the extent of the last volution, and when it is removed, a more or less 
distinct spire becomes visible on the shell. In some Cypree (sensu restricto, Gray), 
which are often distinguished by a thinner shell, the spire remains visible even in 
full-grown specimens. The enamel covering, which exhibits usually the varied 
