MOORE ABXOEiTAL SECONDARY DEPOSITS. 



55: 



I give below another species; and I possessed a more tiu'bi- 

 nated, trochoidal form, which was unfortunately lost. I possess 

 numerous specimens of the same genus from some of the Yorkshire 

 Carboniferous- Limestone-mines ; we therefore have the interesting 

 fact of the appearance of this freshwater genus in Liassic times, and 

 probably in the Yorkshire mines much earher, and its apparent 

 absence until the deposition of the Crag and the fluviatile deposits 

 above, which connect it with living species. 



74. Yalvata PTG:vr^A, spec. nov. PI. XY. figs. 5, 6. 



Shell small, discoidal, depressed; whorls almost on the same 

 plane, or slightly raised at the a-pex, rounded, and separated by a 

 round suture ; aperture rounded^ umbilicus large, shallow. 



This shell is very small, and I possess but one specimen of the 

 species. It also is from the Charter-house mine, and of Liassic age. 

 It is to be distinguished from V. anomala by its more depressed form, 

 and by its more circular aperture. 



75. YERTiao MuRCHisoN^, spec. nov. PI. XY. figs. 11, 12. 



Shell very small, thick, cylindrical; apex obtuse; 4-5 narrow, 

 spirally winding, convex volutions, separated by a winding suture ; 

 surface with veiy faint longitudinal striae ; apertiu^e reversed, longi- 

 tudinally ovate, rather narrow ; peristome continuous. 



Of this terrestrial genus I possess two examples, both having been 

 obtained 270 feet from the surface in the Liassic deposit in the 

 Charter-House mine. They are associated with the marine and fluvia- 

 tile genera previously enumerated ; and their presence is no doubt 

 due to theii' having been carried into the Carboniferous-Limestone 

 fissures by the action of water derived from a terrestrial area. The 

 genus is represented in the present day by about twelve species, my 

 examples being the first evidence of its previous existence. 



Table of Species and Localities. 





i 





-S 



1 



53 



i 



4 



1 



o 

 o 



1 



"u 



q5 

 1 



i 



o 



w 



1 



s 



w. 



1 



H-( 



1- 



J 



i 



c 



1 



Chara Hassica, Moore 



















1 





1 









1 

 1 



Araucaritcs peregrinvis, Sternb 



1 

















Grantia antiqua, Moore 















1 

 1 



1 



1 



Spoiigia, sp 









1 









Cristellaria costata, B' Orb 



1 













— crepidula, F. S^' M. 























— cultrata, Mont 













... 









1 





... 





— lituus 





















— rotula, Lam 



















1 



1 









^ 







_ 













... 













