AND OTHER ENGLISH NUMMU1ITES. 



137 



p. 628, Sowerby's N. elegans is referred to " Lenticulites planulata" 

 Lamarck, with doubt. 



1850. Dixon's £ Geology of Sussex,' &c. 1st edition. 



P. 85. Nummularia variolaria, Sow. Min. Conch, t. 538. f. 3, 

 Stubbington ; common. 



P. 85. N. elegans, Sow. M. C. t. 538. fig. 2, Alum Bay, Isle of 

 Wight : rare. 



P. 85. N. radiata (Montfort), Bracklesham ; rare : pi. ix. fig. 7 ; 

 this is N. variolaria with some of its septal lines raised externally. 



Mr. Sowerby himself drew up this list, and applied the name 

 44 elegans " to the specimens from Alum Bay then under notice, 

 having already given that name to the same species from the same 

 place in 1826, though unfortunately mingled with others (N. 'plan- 

 ulatus) in the description and figures. 



1850. In his ' Histoire des Progres de la Geologie,' vol. iii. (1850), 

 p. 236, M. d'Archiac states that, in Sowerby's pi. 538. fig. 2, 44 les 

 figures de droite, de gauche et la coupe du milieu," named 44 elegans," 

 may be " N. planulata " ; and at p. 240, that in fig. 2 " les trois plus 

 petites seulement " are "N. planulata." These three smallest figures, 

 however, really comprise two of planulatus and one of elegans. 



1852. In the Quart. Journ. Geol. Soc. vol. viii., at p. 350, Sir 

 Charles Lyell added this note to his Memoir on the Belgian Tertiary 

 Formations : — 



" Mr. T. Rupert Jones informs me that the jNummulite figured as 

 N. elegans in the 4 Mineral Conchology ' from specimens marked 

 1 Emsworth, near Chichester,' and which Mr. J. de C. Sowerby has 

 kindly permitted him to examine *, is (as suggested by M. d'Archiac, 

 Hist. Progr. Geol. vol. iii.) undoubtedly the N. planulatus of conti- 

 nental geologists. It is probable, therefore, that in that part of 

 England where the Bracklesham beds with N. laevigatas are so 

 largely developed, strata characterized by N. planulatus also exist ; 

 and it is highly desirable that their relative position should be care- 

 fully studied." 



The succession (downwards) of the jNummulites in Belgium is 

 stated in Sir C. Ly ell's paper, op. cit. pp. 279 and 349, to be : — 



Sables moyens, "j = Upper part of "j 



ou Gres de l the Calcaire I N.variolarius. Laekenian. Barton Clay. 



Beau champ. J grossier. J 



i~\ -i • - fjV. IcBviqatus. ] -n lv f Bao;shot and 



Calcairegrossier. j K \ Bruxelhan. j B | acHesham< 



Sables infe-^ , p anisfiliaT1? - 



rieurs, babies | 



Soissonais, )■ N. planulatus. 



partie supe- | 

 rieure. J 



1854. D'Archiac and J. Haime, in their ' Monogr jSTummulites,' 

 &c. (1853-54), p. 143, refer to Sowerby's N. elegans, 4 Min. Conch.' 

 vol. vi. (1829), p; 76, pi. 538. fig. 2, as N. planulata, var. a, pi. ix. 



* Had the Alum-Bay specimens, also labelled " N. elegans" been examined 

 at the same time, this name would have been retained for them. 



t Unless in an unknown stratum of the " Bognor Hock " (see p. 135) 



Q.J.G.S. No. 170. l 



and Up- 

 per Ypre- 

 sian. 



[Not in Eng- 

 land t.j 



