DTJNBEY GASTEEOPODA. 53 



Shell depressed, widely umbilicate. Whorls about 6, angular 

 and prominent at the band, concave above and below this ; 

 ornamented with numerous costae (about 40), which are prominent 

 on the edge of the last whorl, but are interrupted by the salient 

 sinus-band. The base of the last whorl has numerous costaa 

 radiating from the open umbilicus, these are crossed by spiral 

 lines, giving a somewhat cancellated appearance. These spiral 

 lines are continuous over the whole shell, and the cancellation in 

 the younger whorls is beautifully marked. The base of the last 

 whorl has also a concave depression just below the angle of the 

 whorl, from this again it rises somewhat convexly towards the 

 umbilicus. 



The sinus-band is very salient ; it bears a medium longitudinal 

 line, and a pair of side ones, all crossed by cuiwed transverse lines. 



The specimen figured is in the collection of Mr. Stoddart, 

 F.G-.S. There is a badly preserved one in the Museum. 



Locality — Yeovil and Dundry. Inf: Ool. 



PLEUEOTOMARIA TEXTILIS, Deslongchamps. 



1848 P. textilis, Desl. Mem. Soc. Linn, de Korm. 



yill. pi. 9, fig. 2, pi. 63. 



1850 D'Orb. Pal. fr. Terr. Jur. 2. 



Gast. pi. 391, fig. 6, 10, p. 492. 



Syn? 1854 Gaudryana, D'Orb, Pal. fr. Terr. Jur. 



2, Gast. pi. 364, fig. 11, 12, 

 p. 447. 

 This species is represented by one specimen. 



Locality — Dundry. Inf, Ool, 



TROCHOTOMA GRADrS, Deslongchamps. 



1842 T. gradus, Desl. Mem. Soc. Linn, de Norm. 



YII. pi. 8, f. 4, 7. 

 Syn. 1842 Ditremaria bicarinata, D'Orb, Pal. fr. Terr. 



Cretaces 2, p. 277. 



