Mineral Conchologi/, S{C. 267 



showing several variations in the form of the internal lateral 

 appendage : and Crepidala^ with figures of six very distinct 

 species. 



Mineral Concliology of Great Britain. 



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

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

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

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

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

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

 459, f. 1, Producta fimbriatci', f. 2, P. plicaHlis, both from the 

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

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

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

 A. sitiatus, a crag fossil. Tab. 461, f. 1, Spirifer rotundatus, 

 f. 2, S. cuspidatuSy var. 



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

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

 Limestone ; f. 3 and 4, N. minuta ; f. 5 and 6, N. cosiata, both 

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

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

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

 of the 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 

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

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

 bility of causing fresh-water Mollusca; to live in salt-water, with 

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

 characters of formations , with the applications of these characters 



s 2 



