90 MOLLUSCA FROM THE GREAT OOLITE. 
Leckhampton Hill, near Cheltenham (Buckman); and in the Great Oolite of Langrune, 
Luc, Ranville, &c., Normandy (Deslongchamps). 
The Patella Tessonii (E. Desl.), which is referred to this species with some doubt, was 
obtained from the Inferior Oolite of Moutiers-en-Cinglais by M. Tesson. 
PaTELLA PARADOXA. Plate XII, figs. 2, 2a, 6. y 
P. Testé suborbiculatd, apice depresso, versus marginem anticum inflexo, latere antico 
concavo, postico convexo ; costis radiantibus, elatis, rotundatis, undulatis, transversim striatis, 
et distantibus, costis posticis 9 magnis, lateralibus obscuris, anticis congestis et corrugatis. 
Shell suborbicular, apex depressed, turned towards the anterior margin ; anterior side 
concave, posterior convex; ribs radiating, large, distant, elevated, rounded, undulated and 
impressed by transverse striz; the posterior coste, about 9 in number, are large, those 
upon the sides of the shell are depressed and obscure ; the anterior ribs are congested and 
corrugated. 
The general aspect of this singular shell reminds us of Patella rugosa, which it follows 
somewhat in its varieties of aspect. When young, the few posterior coste are prominent, 
but the sides of the shell are smooth, and the general figure is more depressed and 
elongated ; the costae are much larger than in P. rugosa, more distant, and, in consequence, 
much fewer; and the entire shell has a wrinkled and very rugose aspect. The colours are 
usually more or less preserved. 
Locality. This may be considered as the most rare of the Minchinhampton Patelle. 
The few examples obtained have been found in the planking, or in the equivalent white 
stone of Eastcombs and Bussage. The young form, were it known only by a single 
specimen, would probably be regarded as a distinct species; the older specimens attain 
nearly the dimensions of a middle-sized P. rugosa. 
Pareta suncata, Deslongchamps. Plate XII, figs. 3, 3a, 4. 
PaTRLLA suLcata, Deslongchamps. 1842. Mém. Soc. Linn. de Normandie, vol. vii, 
p. 115, t. 7, figs. 9—11. 
Hexcion — D’Orb. 1850. Prod. Paléont., p. 272. 
P. Testa subellipticd, conico-depressd ; apice recto; costis elatioribus radiantibus, 
tnaqualibus, sguammato-rugosis, sulcis profundis interpositis, margine subcrenato. 
Shell subelliptical, conical, but depressed ; apex erect; ribs elevated, radiating, 
unequal, squamose or rugose, with deep interstitial spaces ; margin somewhat crenated. 
The costae do not increase in size materially as they approach the margin, and the 
additional ribs which are added with increase of growth equal the others in size. This 
