APPENDIX. 311 



MITRA L^VIS ? Dubois. Wolhyn. Pod., t. 1, figs. 2, 3. Fide Phil. 

 DEFRANCII. Payr. Cat. Moll. Cors., p. 166, t. 8, fig. 22. 



CORNICULA. Sismond. Syn. Meth. an. Invert. Fed. Foss., p. 41. 

 VOLUTA PLICATULA. Brocchi. pp. 318 and 646, t. 4, fig. 7. 



CORNICULA. Linn. Syst. Nat., ed. 11, p. 1191- 



Spec. Char. Testd turritd, sublcevigatd, aut obsolete costatd ; anfractibus convexiusculis ; aperturd 

 spiram cequante ; columella triplicatd sive quadruplicatd. 



Shell turreted, nearly smooth, with obsolete ribs ; whorls slightly convex ; aperture the length of 

 the spire; columella with three or perhaps four folds. 



Length, f inch. 



Locality. Cor. Crag, Gedgrave. Recent, Mediterranean. Fossil, Apulia and Piedmont. 



A single specimen of this genus has been obligingly presented to me by Mr. Charlesworth, and this 

 is the only one I have seen. It is not quite perfect, the outer lip being slightly broken, but it is otherwise 

 in good condition ; and there is every reasonable probability of its belonging to one of the variable forms of 

 ebenus. It most resembles the variety with the upper volutions somewhat obscurely costated, having the 

 body one smooth. My specimen has seven volutions, and three distinct folds upon the columella ; the 

 upper two folds large and distant, the third smaller and closer, with a very minute one lower down, perhaps 

 invisible if the lip were perfect. There is a slightly depressed mark around the upper part of the volution, 

 and, in the living state, probably corresponded with Philippi's description, "infra suturas linea albida 

 obscure cinctis." 



A specimen of Mitra is mentioned, in the { Mem. of the Geol. Survey,' vol. i, p. 429, as having been 

 found in the Glacial Beds of Wexford, and referred to M. cornea, Lamk., with doubt. 



MITRA PLICIFERA. 8. Wood. Crag Moll., vol. i, p. 21, t. XXXI, fig. 8. 



Not having been able to obtain anything more perfect than what have been so long in my cabinet, I 

 have had my best specimen figured, in order to call attention to its existence in the Coralline Crag. It 

 appears too strongly costated to be a variety of ebenus, and the apex is more obtuse than in that species. It 

 must, therefore, remain for the present with its provisional name. 



PYRULA ACCLINIS, S. Wood. Tab. XXXI, fig. 6, a, b. 



PYRULA RETICULATA, Lam., vide. Crag Moll., vol. i, p. 42, t. 2, fig. 12. 



A better knowledge of the various recent shells of this genus give reason to believe the differences 

 previously pointed out between the fossil and the recent species, to which it was assigned, are sufficient to 

 entitle it to specific distinction ; I therefore propose for the Crag shell the above name. 



Edward Acton, Esq., of Grundisburgh, has, out of his rich collection, presented me with a cast in sand- 

 stone of what most probably was this species, obtained from the Red ,Crag of Sutton, which appears to 

 present a still greater difference from the recent reticulata than do either of my own specimens, from which 

 the assignment had previously been made. This cast (fig. 6, a) shows a greater elevation of spire than 

 either the recent shell or my own fossils, which might perhaps be expected ; but the excess in height is 

 more than would arise simply from its being a cast, and it shows also more particularly that the shell from 

 which it was taken had a shorter canal than the true reticulata : the latter character is, I think, 

 sufficient to separate our fossil from the existing species, and I am the more readily induced on that account 

 to change the name previously given. 



This is in a sandstone nodule, similar to what has been spoken of at p. 69, and the cavity left by 

 the withdrawal of the shell is imperfectly filled by carbonate of lime in a crystallized state, the crystals 



