Recent and Fossil Foraminifera. 697 



Small specimens similar to our illustration are of moderately 

 frequent occurrence, and are probably miniature shells of the 

 species to which we have referred them. They are, at any rate, 

 indistinguishable from the minute Operculinze, which may be 

 found in recent tropical gatherings ; but we have seen no mature 

 shells, either entire or fragmentary, so the species must be accepted 

 on the evidence of these specimens only. 



220. Opercultna ammonoides Gronovius sp. 



Nautilus ammonoides Gronovius, 1781, Zooph. Gron., p. 282, No. 1220, p. v. 

 Operculina complanata (Defrance) Parker and Jones, 1857, Ann. and Mag. 



Nat. Hist, ser. 2, vol xix. p. 285, pi. xi. figs. 3, 4. 

 Nonionina elegans Williamson, 1858, Recent Foram. Gt. Britain, p. 35, pi. iii. 



figs. 74, 75. 

 Operculina ammonoides (Gronovius) Parker and Jones, 1862, Introd. Foram. 



Appendix, p. 810. 

 Ditto. (Gronovius) Brady, 1884, Foram. ' Challenger,' p. 745, pi. cxii. figs. 



Ditto. (Gronovius) Brady, 1887, Synopsis British Eecent Foraminifera. 

 Ditto. (Gronovius) Goes, 1894, Arctic and Scandinavian Foraminifera, p. 

 105, pi. xvii. fig. 833. 



Two specimens, one fossil, the other apparently recent. This 

 species is frequent in the North Sea at moderate depths, and has 

 been recorded from post-Tertiary deposits. 



NummuUtes Lamarck. 



221. NummuUtes planulata Lamarck. 



222. NummuUtes Ixvigata Lamarck. 



223. NummuUtes variolaria Sowerby. 



224. NummuUtes elegans Sowerby. 



225. NummuUtes Wemmelensis de la Harpe. 



NummuUtes Ixvigata Lamarck, 1801, Syst. Anirn. sans Vert., p. 101. 

 Ditto. (Lamarck) 1804, Ann. Mus., vol. v. p. 241. 

 Ditto. (Lamarck) 1806, Ann. Mus., vol. viii. No. 1, figs. 10 a, b, pi. lxii. 

 NummuUtes IxvigatusBirag. (La march / dArchiac) Lister, 1905, Proc Roy. Soc, 

 vol. B. lxvi., pp. 298-318, pi. iii. 



Specimens of these Nummulites, which are found of every dimen- 

 sion, from the most microscopic forms up to specimens 1 • 5 cm. in 

 diameter, occur in every gathering we have made along the shores 

 of Selsey Bill, from Pagham Harbour to West Wittering, and they 

 present a complete series of microspheric and megalospheric forms, 

 running from one species into another, from N. planulata to N. 

 Wemmelensis (or Prestwichii), and it would be beyond the scope of 

 the present paper to attempt anything like a complete classification 

 of the series. As far as our researches have taken us, in examining 



