4C2 GASTEROPODA OF THE INFERIOR OOLITE. 



The base is roundly oval, with a perfectly smooth edge. The surface is smooth, 

 but with a strong lens it is possible to discern very faint concentric lines. 



Relations and Distribution. — The points wherein P. nitida differs from 

 P. inornata have been already indicated. P. nitida is stated by Deslongchamps to 

 be common in the Bath Oolite of Normandy, whereas at Minchinhampton it seems 

 to be represented only by P. inornata. Scnrria nitida is quoted by Dr. Glangeaud 

 (' Le Jurassique a I'ouest du plateau central,' p. 119) from beds of Bajocianage. 



407. Patella nana, Sowerhj, 1824. Plate XLII, figs. 6 a, 6&. 



1824. Patella nak^a, Sowerly. Min. Couch., pi. cdlxxxiv, fig. 3. 



1851. _ _ _ Morris and Lycett, Gt. OoL Moll., pt. 1, p. 93, 



pi. xii, fig. 10. 

 1854. _ _ _ Morris, Cat., p. 26G (G. 0.). 



Bihliography, ^-c — Sowerby's enlargement of his P. nana from Ancliff repre- 

 sents a more oval shell than the one now figured. Morris and Lycett figure a 

 more conical form with almost central apex, and this is the prevailing form at 

 Minchinhampton and Bussage. It is just possible that Sowerby's species may be 

 different. 



Description (Lincolnshire Limestone specimen) : 



Length . . . . .9 mm. 



"Width . . . .8 mm. 



Heio-ht ..... 5*5 mm. 



Shell small, suborbicnlar, conical ; apex almost central, erect and subobtuse, 

 smooth. 



Relations and Distribution. — This small species has the most orbicular base of 

 any of the smooth Patellas of the Inferior Oolite, and is correspondingly^ lofty. 

 Specimens from the Lincolnshire Limestone are rather smaller and less peaked than 

 some of those from the Great Oolite of Minchinhampton. Under certain conditions 

 of preservation fine " cingulate " ornament may be detected, but the shell is always 

 more peaked than Goldfuss' representations of P. cingulata. 



Most of my specimens are from the Lincolnshire Limestone at Stoke Lodge. 

 Not hitherto noticed in the Inferior Oolite of the Cotteswolds. 



Section B with radial ornament. 



