AXD OTHEE ENGLISH NUiTiTULIIES. 



143 



1850. Nummularia elegans, Sowerby in Dixon's Geol. Sussex, 

 p. 85. 



1850. Nummulites planulata (part.), D'Archiac, Hist. Progres 

 Geol. vol. iii. pp. 236 and 240. 



1853. Nummulites planulatus (part.), Jones, Quart. Journ. Geol. 

 Soc. vol. viii. p. 350, note. 



1854. Nummulina planulata, var. a, vel minor (part.), D'Arch. 

 & Haime, llonogr. Num. p. 143. 



1854. Nummulites planulatus (part.), ITorris, Cat. Brit. Foss. 2nd 

 edit. p. 38. ' 



1862. Nummulina planulata, var. Prestwichiana, Jones, Quart. 

 Joura. Geol. Soc. vol. xviii. p. 93. 



1878. Nummulina planulata, var. Prestwichiana, Jones in Dixon's 

 Geol. Sussex, 2nd edit. p. 172, note. 



1881. Nummulites elegans (part.), De la Harpe, Numm. Suisse, 

 part i. p. 29. 



1882. Nummulites Wemmellensis, var. Prestwichii, De la Harpe, 

 Catal. Foss. Foram. Brit. Hus. pp. 92, 93. 



1883. Nummulites Wemmellensis, var. Prestwichiana, De la Harpe, 

 Nuinm. Suisse, part iii. p. 169. 



1886. Max vcn Hantken in the Foldtani Kozlony, xvi. Kotet, 1886, 

 in a paper on some American Nummulites (p. 188), pi. 1. fig. 4, 

 gives " N. elegans " after De la Harpe, Etude Numm. Suisse, p. 175, 

 pi. 7. f. 12-23, with 5 whorls, not rapidly increasing. 



In addition to the general description of N. elegans {Prestwichiana') 

 given above at page 138, the following notes on its size and 

 proportions will be useful in its identification. (Mr. C. D. Sherborn 

 has kindly given me his help in measuring the small English 

 Nummulites.) 



Sowerby's figure* no. 10 in "fig. 2," magnified probably two 

 diameters, represents a specimen about 2i millim. across, with 4 

 whorls, there being the following number of chambers in the 

 whorls : — 



1st. 2nd. 3rd. 4th. 



7 14 22 35? 



Sowerby's specimens (from the bed " no. 29," Alum Bay), 

 flattened by pressure, are of various sizes, as usual ; and one, broken 

 open (not artificially bisected *) and not well preserved, gives : — 



* Sowerby's mounted specimens of " N. elegans " from Alum Bay do not offer 

 any good horizontal sections. Those that hare their median chambers exposed 

 have been broken open, in breaking the matrix, with such an uneven fracture that 

 they do not show sections of an even plane like that seen in specimens carefully 

 ground down, and hence they have the central chambers obscure. 



