EMARGINULA. 451 



hitherto referred to Fissitrella belong to another genus, possibly to Pundurella. 

 I have never seen either in the Inferior Oolite or the Great Oolite a true keyhole 

 Limpet.^ 



I have not seen any members of this family in the Dorset-Somerset district, 

 nor in the Yorkshire Dogger. Inferior Oolite specimens are from the Cotteswolds 

 and the Lincolnshire Limestone, but in all cases somewhat rare. 



Genus — Emarginula, LamarcJc^ 1801. 



Shell oval, conical, elevated^ with the apex recurved ; surf ace cancellated ; anterior 

 margin notched ; nucleus spiral ; slit variable in extent. 



392. Emarginula scalaris, Soioerbi/, 1826. Plate XLI, figs. 12 a, 12 b. N.B. — In 



the figured specimen the intercostal lamellse have 

 perished. 



182G. Emaeginula scalaeis, Sotverli/. Min. Conch., pi. dxix, figs. 3 and ? 4. 



1851. — — — Morris and Lycett, Gt. Ool. Moll., 



pt. i, p. 88, pi. viii, fig. 4. 



1854. — — — Morris, Cat., p. 246, as from the Great 



Oolite and Inferior Oolite. 



1885. Emaeginula scalaeis, Sowerhj. Cossmann, Etage Bathonien, p. 34G, 



pi. xii, figs. 39 and 40. 



? Non — — — Deslongchamps, Mem. Soc. Linn. 



Norm., vol. vii, p. 125 ; and ? pi. vii, 

 figs. 30—32. 



Bibliography, Sfc. — The Ancliff fossils differ somewhat from those now figured ; 

 but the differences are probably due to mineralisation to some extent. 

 Deslongchamps' identification is held by Cossmann to be incorrect, and he has 

 named the species so identified E. Beslongchamysi. 



Description (based on specimens from the Lincolnshire Limestone) : 

 Length ^ c . . . A mm. 



2-75 mm. 

 2*75 ram. 



AVidth I, Approximate . 

 Heisfbt 



'&' 



Shell elevated, apex posterior, periphery ovate, with slight expansion of the 

 anterior area. The ribs, about seventeen in number, are nearly equal and 



^ PI. viii, fig. 5, of Morris and Lycett's work must, I fear, be regarded as the result of artistic 

 treatment. 



