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GASTEROPODA OF THE INFERIOR OOLITE. 



Shell conical, spire acute ; whorls five or six, flat and well separated by the 

 suture. The ornaments consist of three rather finely granulated spirals of equal 

 prominence, with widish interspiral sulci where the axial ornamentation is well seen. 



Body- whorl subangular, with five plain spirals in the base ; aperture subovate. 

 N.B. — The figured specimen has suffered considerably from usage. 



Relations and Distribution. — Despite the very considerable difference of 

 appearance, this is probably the representative in the Lincolnshire Limestone of 

 shells not far removed from Littorina sulcata. Its perfectly conical form and 

 freedom from turriting seems to distinguish Litt. Weldonis from Amb. gemmata 

 or Litt. sedilis. 



Rather abundant in the upper beds of the Lincolnshire Limestone. 

 233. Littorina jsdilis, Munster, 1844. Plate XXIV, fig. 1 and ? fig. 2. 



1844. Turbo ,edilis, Miinst. Goldf., Petref., pi. cxciv, fig. 9. 



1869. — — — Brauns, Mittl. Jura, p. 180. 



1873. Littorina ^dilis, Miinst. Tawney, Dundry Gasteropoda, p. 23 (15). 



Description : 



Length . . . . .13 mm. 



Length of body- whorl to total height . . 54 : 100. 



Spiral angle ..... 52°. 



Shell ovately conical, turrited ; spire acute. Whorls five or six, angular, 

 widely separated by the suture. The ornaments consist of three prominent 

 spirals decussated at the widely separated nodes by coarse axial costae ; in the 

 gape of the suture a fourth spiral may sometimes be seen. 



Body-whorl subangular and slightly ventricose ; ornaments similar to those 

 of the spire, with five rather fine spirals in the base ; fine axial. striae throughout. 

 Aperture ovate, pillar-lip produced in front. 



Relations and, Distribution. — There cannot be much doubt as to the correct- 

 ness of Mr. Tawney's identification. A few specimens have been found at 

 Dundry, and possibly such a form as fig. 2 may represent this species in the 

 Lincolnshire Limestone. 



Litt. sedilis is a sort of poor relation to the ornata-grouip, and is more or less 

 intimately connected with numerous named forms. The species next described is 

 probably only a local variety of polymorphous tendencies. 



