396 J. F. BLAKE AND W. H. HUBLESTON ON 



tified ; but they are more rhomboidal, and the lines or layers of 

 growth are not so strongly marked, while the interspaces are 

 striated. To prevent confusion we figure one of our shells, which 

 are exceedingly characteristic of the Upper Calcareous Grit of York- 

 shire. 



Lucina Beanii. 



The shell which has long borne this name in Yorkshire, we have 

 little doubt is the same as the L. globosa of Buvignier. 



Lucina octltjs, spec. nov. PI. XIY. figs. 9, 9 a. 



Height nearly equal the length, thickness of the two valves 

 together | the height, making the valves very convex, most so over 

 the umbones, which are -| the length from the anterior end ; urn- 

 bones not projecting far beyond the dorsal edge. Lunule and 

 escutcheon both well marked ; the lunule widest and shortest ; 

 ornaments, fine regular concentric riblets. 



This is nearly allied in shape and ornaments to L. Moreana, Buv.; 

 but it is more inflated, and the characters on the hinge-line, which 

 give it the appearance of a pair of spectacles, very clearly separate it. 



In the Coralline Oolite of Xawton, Malton, &c. 



Unicarbium plenum, spec. nov. 



All the Unicardia found in Corallian beds have hitherto been 

 named U. depressum (Phillips) ; but there are certainly two forms 

 which may be easily distinguished. We do not figure the one 

 we call U. plenum, as there is little to characterize it ; but it is 

 distinguished by its greater obesity, and the obvious inappropriate- 

 ness for it of the term " depressed." 



It is most often found in the Coralline Oolite of Malton. 



Astarte Duboisiana, D'Orbigny. PI. XY. fig. 3. 



This form, which was not figured by D'Orbigny, is highly cha- 

 racteristic of some portions of the Coralline Oolite of Yorkshire, 

 and is therefore figured for reference. 



l o" 



Astarte subbepressa, spec. nov. PI. XIY. fig. 10. 



Shell suborbicular ; height T 9 ^- the length ; valves much depressed, 

 but very uniformly convex. Umbones slightly anterior, very in- 

 conspicuous ; lunule almost linear ; posterior dorsal margin nearly 

 straight, anterior slightly concave. Ornaments, very regular fine 

 ribs with equal spaces between them, almost uniformly over the 

 whole surface. 



Length 11 lines, which is about a medium size. 



The general orbicularity, and the regularity and fineness of the 

 ribs, distinguish this from other depressed Astartes, the nearest being 

 one described by De Loriol as A. boucardensis. 



In the Coral Pag of Wiltshire. 



