452 GASTEROPODA OF THE INFERIOR OOLITE. 



promiuent, but considerably narrower than the intercostal spaces. The latter are 

 traversed by a system of cross-lines or lamellae, giving the shell a scaly appearance 

 (scarcely seen in the figured specimen). The two ribs which enclose the fissure 

 approximate, but of the length of the fissure it is not easy to speak with certainty. 

 The margin was probably crenulate. 



Relations and Distribution. — This form, which most nearly approaches 

 E. scalaris of the Great Oolite, is fairly abundant in what is believed to be the 

 tipper part of the Lincolnshire Limestone at Spittlegate Quarries. The species is 

 quoted by Lycett from the Inferior Oolite of Leckhampton, but I have not seen any 

 satisfactory specimens from that quarter. 



393. Bmaeginula. Leckhamptonensis, Lycett, 1850. Plate XLI, figs. 11 rt, 11 b. 



1850. Emaeginula Leckhamptonensis, Lycett. Anu. Mag. Nat. Hist., 2nd 



ser., vol. vi, p. 415. 



1853. _ _ _ Proc. Cotteswold Nat. Club, 



vol. i, p. 7(5. 



Description. — "Oval, depressed; apex posterior; costge large, rounded and 

 tuberculated, where crossed by encircling lines; costse twenty-six in number." 



The figured specimen answers in many respects to Lycett's brief diagnosis, 

 especially as to its oval shape and depressed character, but the costse are no more 

 than twenty in number. The following are the dimensions of the figured specimen, 

 which is from Leckhampton. 



Length ^ f . . . 2"5 mm. 



Width \ Approximate 

 Height J 



2 mm. 

 1*25 mm. 



394. Bmarginula Lindonensis, sp. nov. Plate XLI, figs. 14 a, 14 b ; and ? 13 a, 



13 6. 



Description : 



Length . .. . . .4 mm. 



Width . . . . .3 mm. 



Height ..... 2-75 mm. 



Shell elevated, apex very posterior, periphery ovate and rather expanded 

 anteriorly. Number of ribs twenty-five to twenty-six, prominent and wide. The 

 intercostal spaces have closely-set lamellee which infringe upon the costse and 

 produce a granular appearance ; very fine intermediate costae may also be noticed. 

 There is but slight approximation of the pair of ribs which contain the fissure. 



