GASTROPODA. 63 



moderate limits; but the chief distinguishing features are, that the posterior 

 canal does not ascend along the spire in Fugnellm giganteus, and that the aperture 

 is much broader towards the anterior end in the latter than in the former. Whe- 

 ther there existed differences as regards the ornamentation of the shell, I am unable 

 to say at present. 



Family : CTFBJEIDJE. 



Genus : OVULA, BrugiSre. 



OvULA EXP ANSA, d'Archiac and Haime. PI. XVII. fig. 3-3c ; 

 PI. XVIII, fig. 2-2b, 3-3c, 4.4c. 



1853. Ovttla expansa, d'Archiao and Haime ; Descr. des Anim. foss. des Groupe Numm. de I'Inde, page 330, 

 pi. XXXIII, fig. 3. 



The shell attains a considerable size, the largest specimen teing 90 mm. in 

 height, having a transverse diameter of about 65 mm. It is nearly globular, but 

 slightly elongated in the anterior and posterior direction, attenuated at the an- 

 terior, expanded at the posterior end ; general shape turbinoid. It is difBcult to 

 say whether, in specimens which have the substance of the shell preserved, the 

 spire is completely concealed or not ; to judge from some ill preserved specimens 

 it was not externally visible, and its position was only indicated by a short pro- 

 traction of the last whorl. The casts, however, expose a low, nearly flat spire, 

 composed of at least four slightly inflated whorls rapidly increasing in height and 

 thickness. The last whorl is ventrioose and strongly inflated towards its end. 

 Aperture sinuous, very narrow and slit-like at the posterior, but slightly broader at, 

 the anterior end. Posterior canal very narrow, anterior one short, broad, slightly 

 turned upwards, and transversely cut ofE. Outer lip smooth, thick and inflated, 

 apparently bearing a flat ridge on the inside ; inner lip smooth and not crenulated. 

 Surface apparently smooth. 



Looality and stratigrapUcal position. — Mazar Drik, Des valley. 



'Bemarhs. — Messrs. d'Archiac and Haime have described six species of the genus 

 Ovula, but it seems that they themselves were in doubt as to their specific independ- 

 ence. In fact it seems difficult to understand what difference exists between Ovula 

 depressa Sow., and Ovula expansa d'Arch. and Haime. 



Mr. Fedden^ lin his list of the distribution of fossils described by Messrs. 

 d'Archiac and Haime considered 0. murchisoni, d'Arch. and 0. elUpsoides, d'Arch. 

 as eocene species ranging from the Ranikot to the Khirthar beds. The horizon of 

 Ovnla depressa^ 0. elongata and 0. cyUndroides, d'Arch., is unknown, and Ovula 

 expansa is with some doubt said to occur in the cretaceous and Ranikot bed. 



In the collection of fossils from the Cardita beaumonti beds from Sind, two 

 species of Ovula are found, which differ distinctly from each other, and which 

 therefore represent decidedly different species. The latter one agrees in every 

 detail with the medium sized specimens from Baluchistan, so that there is no 



^ Mem. Gaol. Sarv. Ind. XVII. 209. 



