Mineral Conchologt/, S^-c. 267 



showing several variations in the form of the internal lateral 

 appendage : and Crepidula, with figures of six very distinct 

 species. 



Mineral Conchology of Great Britain. 



The 79th number contains, tab. 456, f. 1, Tellina striatula, and 

 f. 2, T. inwqualis, both from the green sand of Blackdown. 

 Tab. 457, two figures of a most singular fossil called Orthocera 

 paradoxica, from the Mountain Limestone in Ireland. Tab. 458, 

 f. 1, Nautilus expansus, from the Chalk Marl at Hamsey; f. 2, 

 N. biangulatas from the Mountain Limestone near Bristol. Tab. 

 459, f. 1, Producta fimhriata; f. 2, P. plicatilis, both from the 

 Derbyshire Mountain Limestone : f. 3, P. depressa, from the 

 Dudley Limestone. Tab. 460, f. 1, Acteon crenatus ; f. 3, 

 A. elongatusy both from the London Clay at Barton Cliff; f. 2, 

 A. sir tat US, a crag fossil. Tab. 461, f. 1, Spirifer rotundatus,, 

 f. 2, S. cuspidatusj var. 



No. 80 contains, tab. 462, Sanguinolaria compressa, from Bar- 

 ton Cliff: tab. 463, f. 1 and 2, Nerita spirata, from the Mountain 

 Limestone; f. 3 and 4, N. minuia; f. 5 and 6, N. costafa, both 

 from the Oolite at Aucliff: tab. 464, several species of Bullae: 

 tab. 465, Aancula. ventricosa and buccinea : tab. 466, Saxicava 

 rugosa: and tab. 467, MYOCONCHyV crassa; the descriptions 

 of tlie last three plates will be given in No. 81, we do not there- 

 fore make any remarks at present on the new Genus here pro- 

 posed. 



De la Beche's Selection of Geological Memoirs. 



Mr. De la Beche has recently published, translated into 

 English, an useful selection of the Geological Memoirs contained 

 ia the Annates des Mines ; among which are the following arti- 

 cles on Zoological subjects : — Extract of a Memoir on the possi- 

 bitUy of causing fresh-water Molluscw to live in sall-zoater, with 

 Geological applications. By M. Bcudant. — On the Zoological 

 characters (^ formations^ zoith the applications of tliese cliaructcrs 



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