GASTEROPODA. 87 



R. Testa conicd; apice postice curvato; ambitu ovali; rimd angustd, costis majoribus 

 radiantibus (circa 18), minoribus tranversis decussatis. 



Shell conical ; apex somewhat spiral, and curved posteriorly ; base oval, foramen 

 narrow, lengthened, and rather distant from the anterior margin ; ribs radiating (about 18 

 in number), crossed by others, smaller and transverse. 



The indifferent condition of the original specimen will account for its having been 

 placed with Emarginula. 



Locality. AnclifF and Minchinhampton ; at the latter place it occurs only in the bed 

 of planking : it is rare. 



RIMTJLA BLOTII, Desl., sp., Plate VIII, fig. 3, 3, 6, c. 



EMAKGINTJLA BLOTII, Deslongchamps. 1842. Mem. Soc. Linn, de Normandie, torn, yii, 



pi. 10, figs. 1 3. 

 If Orb. 1850. Prod. Palont., p. 303. 



R. Testa pared, crassd, conicd; apice postice curvato, lateribus subplanis; costis radi- 

 antibus magnis 15 etparvis 14 alternis; sulcis punctis tranversalibus magnis notatis. 



Shell small, thick, conical ; apex curved posteriorly, the sides flattened ; ribs radiating, 

 15 larger and 14 smaller, alternating the three larger anterior ones being the most 

 prominent ; the transverse sulci of the interstitial spaces are large. 



This species bears a considerable resemblance to R. tricarinata; but it is more com- 

 pressed laterally, the three large anterior costae are less divergent, and the form of the base 

 is a longer oval. The R. tricarinata is likewise destitute of the smaller ribs, and has more 

 numerous transverse lines. 



Locality. It occurs rarely at Ancliff; and is likewise scarce in the shelly roestone of 

 the Inferior Oolite at Leckhampton Hill, Cheltenham. A single specimen, badly preserved, 

 has also been procured at Minchinhampton. Colleville, Calvados. 



EMARGINULA, Lam., 1801. 



PATELLA sp., Linn. 

 EMARGINULUS, Montf. 1810. 



Shell conical ; apex usually curved posteriorly, base entirely open, orbicular or oval ; 

 its anterior margin having a vertical fissure more or less lengthened ; surface ornamented 

 with ribs, and decussated. 



