44 MOLLUSCA FROM THE GREAT OOLITE. 



NATICA VERNEUILI, Archiac. Plate VI, figs. 6, 6a, 7, la. 



NATICA VEENEUILI, Archiac. 1843. Mem. Soc. Geol. France, t. 5, p. 378, pi. 30, fig. 3. 

 Bronn. 1848. Index Palaeont., p. 788. 

 D'Orb. 1850. Prod. Paleont., p. 299. 



.A 7 ! Testa subhemisphericd, spird data, anfractibus (5) angustis et convexiusculis, apice 

 acuto ; anfractu ultimo per magno, ventricoso ; aperturd magnd scmilunari ; basi laid et 

 rotundatd. 



Shell subhemispherical, spire elevated, whorls (5) narrow and slightly convex, apex of 

 the spire acute, last whorl very large and ventricose, aperture large, semilunar, base wide 

 and rounded. 



The planking has supplied the only good specimens of this rare species. It would 

 also seem to occur in the calcareo-arenaceous beds of the upper portion of the formation, 

 judging by the aspect of casts. Length 23 lines, breadth 22 lines. 



Locality. Minchinhampton. Eparcy, France. 



NATICA MICHELINI, Archiac. Plate VI, figs. 2, 20, 3, 3. 



NATICA MICHELINI, Archiac. 18-43. Mem. Geol. Soc. France, t. 5, p. 377, pi. 30, fig. 1. 

 Bronn. 1848. Index Palseont., p. 785. 

 D'Orb. 1850. Prod. Paleont, p. 299. 



N. Testa ovatd, spird parva, apice submamillato ; anfractu ultimo elongato, basi lata ; 

 aperturd superne angustatd ; labro interno cattoso convexiusculo. 



Shell ovate, spire small ; apex submamillated, last whorl elongated, its base wide ; 

 aperture narrow above ; lip somewhat thickened, straight, and convex. 



The straight border of the inner lip, its convexity, and the minute spire, sufficiently 

 characterise it. The spire consists of 5 or 6 whorls, of which the first two or three form a 

 minute mamillated apex. Our figures sufficiently represent the varieties of form, of which 

 the more elongated is the most common. The planking contains it not unfrequently ; and 

 some beds in the upper limestones contain numerous casts, which can scarcely be referred 

 to any other shell. 



Length of the globose variety 18 lines, width 16 lines; length of the elongated variety 

 18 lines, width 13 lines. 



Locality. Minchinhampton. Eparcy and Sancerre, France. 



NATICA AMBIGUA. Plate VI, fig. 5. 



? CASSIS EPARCYENSIS, Archiac. 1843. Me"m. Soc. Geol. France, torn, v, p. 385, 



pi. 31, fig. 10. 

 ? ACTEONINA EPAKCYENSIS, D'Orb. 1850. Prod. Paleont., p. 299. 



