462 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. wnitida 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. Scurria nitida is quoted by Dr. Glangeaud 
(‘ Le Jurassique 4 louest du plateau central,’ p. 119) from beds of Bajocian age. 
407. Parenta NANA, Sowerby, 1824. Plate XLII, figs. 6a, 60. 
1824. Parenna nana, Sowerby. Min. Conch., pl. edlxxxiv, fig. 3. 
1851. — — — Morris and Lycett, Gt. Ool. Moll., pt. 1, p. 93, 
pl. xu, fig. 10. 
1854. — — — Morris, Cat., p. 266 (G. O.). 
Bibliography, §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 : : : ‘ = 9mm: 
Width : : . 8mm. 
Height : . 55 mm. 
Shell small, suborbicular, 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. 
