GASTEROPODA. 91 
species possesses a general resemblance to P. Aubentonensis, but the ribs are much more 
elevated, closely arranged, and rugose. The figure given by M. Deslongchamps is more 
elevated, but possesses no other essential distinctive character. Length 9 lines, breadth 
7 lines, height 3 lines. 
Locality. Rare, in the planking of Minchinhampton Common; also found in the 
Inferior Oolite of Port-en-Bessin (Deslongchamps). 
PATELLA STRIATULA. Plate XII, figs. 5, 5a, 0. 
P. Testa parva, conicd, obtusa ; ambitu ovali; costis radiantibus, tenuioribus, crebris, 
flexuosis et nodulosis ; lineis incrementi irregularibus. 
Shell small, conical; apex obtuse ; base oval; with ribs radiating, fine, closely arranged, 
waved, and nodulated ; lines of growth irregular. 
This species is more elevated than P. Audentonensis, and the apex more obtuse; the 
costze are likewise finer and more closely arranged. 
Locality. Yn the soft shelly Oolite beneath the planking at Minchinhampton, where 
it is rare. 
Patriua Rormerti. Plate XII, figs. 6, 6a, 4. 
P. Testa ellipticd, depressd ; apice subcentrali ; costis (30) radiantibus elatis ; lineis 
interstitialibus numerosis ; striis transversis impressis; lineis incrementi trregularibus 
paucis. 
Shell depressed, elliptical ; apex subcentral, with 30 radiating and elevated ribs ; inter- 
stitial lines numerous, the whole being crossed and impressed by striz; lines of growth 
irregular and few. 
This elegant little species is sometimes nearly discoidal, the central portion being most 
frequently denuded of costs ; the form is more nearly circular than P. Aubentonensis, and 
more depressed ; the costa are more elevated and less rounded, the interstitial spaces 
being much deeper. The longer diameter rarely exceeds 9 lines, the elevation being 
about 2. 
Locality. t is moderately rare, but not confined to any one shelly bed, in the vicinity 
of Minchinhampton. 
PATELLA AUBENTONENSIS, Archiac. Plate XII, figs. 7, 7a, 4, ¢, d. 
PaTELLA AUBENTONENSIS, Archiac. 1843. Mém., Soc. Géol. de France, vol. v, p. 377, 
t. 28, fig. 8. 
HELCION — D’Orb. 1850. Prod. Paleont., p. 304. 
