130 MOLLUSCA FROM THE GREAT OOLITE. 



The figure is remarkable for the smallness of the auricles and lengthened outline ; the 

 convexity is less than is usual in other of the ornamented aviculae of the Lower Oolites. 



It would appear to be nearly allied to a species which occurs in the Inferior Oolite of 

 the Cotteswolds, from which it is distinguished by the shorter hinge border, less convex 

 form, and fewer radiating costse ; it is not, however, quite certain that the Inferior Oolite 

 shell may not be only a variety. 



Locality. — Scarborough, in the bed of Grey Limestone. 



Pinna cancellata, Bean, MSS. Tab. XIII, fig. 20a, b. 



Testa ovato-lanceolatd, quadriquetrd, antice convexd plicis magnis concentricis ; postice 

 compressiusculd ; striis transversis crebris et lineis radiantibus angustis nodosis distantibus 

 decussatis. 



Shell ovately lanceolate, straight, quadriquetral, anterior side convex, with large densely 

 arranged irregular, concentric plications ; middle and posterior side more compressed, with 

 fine irregular striations crossed by a few (about 12) longitudinal radiating knotted lines. 



The single valve at our disposal does not exemplify the convexity and figure of the 

 posterior aperture. It appears most nearly to resemble Pinna Hartmanni, Goldfuss, but 

 it is more straight, with much fewer radiating lines, none of which are visible upon the 

 anterior slope. 



Locality. — Scarborough, in the Grey Limestone. 



Lima punctata, Sow., sp. Tab. XV, fig. 9a, b. 



Plagtostoma pxjnctatum, Sow. Min. Con., t. 113, f. 1, 2. 

 Lima punctata, Gold/. Petref., p. 81, t. 101, f. 2. 

 Plagiostoma punctatum, Morris. Catal., 1843, p. 117. 



Testa ovato-obliqud, convexo-pland ; margine antiore subrecto, elongato, abrupie truncato ; 

 lunula excavatd ; auriculis parvis inaqualibus ; margine posteriore et inferiore rotundo ; 

 superjicie Icevi striis angustis, numerosis sub-flexuosis, dense punctatis. 



Shell ovately oblique, rather flattened; anterior margin nearly straight, truncated, 

 elongated ; lunule large, excavated ; auricles small, unequal ; the posterior and inferior 

 borders of the valves regularly rounded ; the surface is smooth, with very numerous, 

 narrow, slightly waved, and densely punctated striations, crossed by a few irregular folds 

 of growth. 



The smooth shining surface, densely arranged striations which cover the entire surface 

 of the shell, and flattened elongated form, readily serve to distinguish it from other 

 species of the lower oolites. 



Localities. — The specimen forwarded to us from Yorkshire is from the hard Grey 

 Limestone of Scarborough. In the Cotteswolds it occurs abundantly in the Inferior 

 Oolite ; but it has not occurred in the Great Oolite of the latter district. 



