14 MOLLUSCA FROM THE CRAG. 



1. OvuLA Leathesii. /. Sotv. Tab. II, fig. 1, a — d. 



OvTJLA Leathesii. J. Sow. Min. Con. t. 478, 1824. 



— Nyst. Coq. foss. de Belg. p. 005, pi. 43, fig. 19, 1844. 



Calpurna Leathesii. Flem. Brit. An. p. 331, 1828. 

 OvuLA Leathesii. S. Wood. Catalogue 1842. 

 OvuLUM Leathesii. Morris. Catalogue, p. 15.5, 1843. 

 Bulla spelta. Linn. 

 0. Testa ehngato-ovatd, fusiformi, medio ventricosd, idrincfie sitbacuminatd ; aperturd 

 superne lineari, in/erne suh-effusd ; labro intus incrassato, subtus rotmidato-a?i^ulafo ; 

 columella mperne uniplicatd. 



Shell elongato-ovate, fusiform, smooth, rather ventricose in the middle, slightly 

 acuminated at each extremity ; aperture contracted above, and a little expanded at the 

 lower part, with a very short canal ; outer lip thickened within, reflected on the 

 exterior ; inner lip thin, expanded, with an obtuse fold upon the upper part, above the 

 spire. 



Axis, '4 of an inch. 



Locality. Cor. Crag, Sutton. 



Red Crag, Walton Naze. Recent, Mediterranean. 



This is at present rare in the Red Crag, and I have only a fragment from the 

 Coralline Formation. It is in an altered condition, some of the outer coating has gone, 

 leaving the reflected outer lip separated from the shell. There are some faint traces of 

 denticulations upon the inside of the outer lip, as well as a few striae upon the lower 

 part of the shell ; the inner lip is depressed, slightly concave, with a projecting 

 callosity inward. So far as the altered state of this shell will allow of a fair com- 

 parison, I do not see any good specific character by which it can be separated fi'om 

 Bulla spelta of Linnaeus, which is given as a Touraine fossil by Dujardin (Mem. de la 

 Soc. Geol. de France, 1837, p. 302.) 



Gen. CypRjEA,* Linn. 1740. 



Pekibolus (spec.) Adanson. 1/57. 

 Coccinella, Leach. 1820. 

 Trivia. Gray. 1830. 



Gen. Char. Shell oviform, oljlong, or subglobular, with a short depressed spire, 

 visible only in the young state ; covered with a coating of enamel in the adult. Aper- 

 ture linear, as long as the shell, crenulatcd or denticulated on both sides, terminating 

 at both extremities in a short canal, with an inflected and inflated outer lip, generally 

 smooth, sometimes pustulous, or transversely ribbed. 



In my Catalogue the species belonging to this genus were enumerated under the 

 name of Trivia, proposed by Mr. J. E. Gray, for the reception of those species which 

 are transversely ridged or sulcated upon the exterior ; as the animals, however, are known 

 not to differ in any essential character from true Cyprsea, I have accordingly restored 



* Etym. Cypris, one of the names of Venus. 



