516 EEV. G. E. WHIDBORKE ON SOME FOSSILS 



the Inferior Oolite of Bradford Abbas. The right valve is mar- 

 ginally convex, but centrally flat : the umbo, which was probably 

 gone in Goldfuss's specimens, is small, delicate, and bent backwards. 

 It is covered by about 15 sharp distant rays, which have a tendency 

 to become spinulous. The left valve is flat or concave, covered by 

 innumerable granulations which tend to arrange themselves in 

 longitudinal lines. 



It seems to occur in Germany higher in the series. D'Orbigny 

 has given Goldfuss's name as a synonym for 0. gregaria, but appa- 

 rently without reason. It bears some resemblance to PI. catinus, 

 Desl., Mem. Soc. Linn. Norm. vol. ii. t. 16. fig. 8; but in that the rays 

 are less acute, and the upper valve is smooth. 



Geevillia gladiolus, n. sp. Plate XVI. figs. 7, 7a. 



Shell very straight, sabre-shaped and elongated, exceedingly 

 oblique, nearly equivalve, convex near umbo, but almost flat in the 

 further half of the shell ; edges acute ; hinge-line apparently less 

 than half the length (2 : 2|) : umbones at the anterior extremity, 

 small, approximate, and not distinct from the rest of the surface, 

 that of the right valve being much the smaller ; the margins 

 nearly parallel, the anterior one curving suddenly round to the 

 umbo, so that the anterior auricle must be rudimentary ; shell 

 exceedingly thin, apparently crowded with fine, concentric, irregular 

 striae, which appear somewhat pustulose ; posterior muscle-mark in 

 the centre of the shell, large, ovoid, and concentrically ridged. 



Locality. Dundry. One specimen in the Bristol Museum. 



Dimensions. Length 1^ inch, breadth 5^, depth -|. 



This fine shell seems to be very distinct. I have found nothing at all 

 approaching it described from Jurassic rocks. The fossil is, in parts, 

 much worn so as to give the interior characters, but in other parts 

 the original surface seems to remain uninjured. The matrix is deep- 

 yellow ferruginous sand including numerous rounded quartz grains, 

 a not unusual condition iu the Dundry beds. 



Geevillia inteemeeia, n. sp. Plate XVI. figs. 8, 9. 



Shell extremely inequivalve, somewhat contorted ; right valve 

 elongated, very convex, especially longitudinally, subspirally curved 

 to umbo, which is very prominent and carries on the same curve 

 over the hinge -line, almost at its anterior point ; anterior auricle 

 distinct, but small ; hinge-line twisted in front, elongated, two thirds 

 the width of the shell ; anterior margin very steeply curved. 

 Margins inclining to each other at a slight angle, and meeting in a 

 very convex curve at the postero-inferior corner ; posterior margin 

 slightly concave near the hinge-line. Surface in most specimens 

 covered with slight irregular growth-lines, but, in one very well- 

 preserved specimen, showing very numerous, concavely scalloped, 

 delicate, concentric lamina?, of which some traces may be seen in 

 the other specimens. 



Left valve very much smaller, longitudinally flat, transversely 

 convex ; umbo small, not reaching hinge-line ; very differently 



