N'eiv anil Iha-e Fossils. 173- 



Ohsrrrations. — This species was hitherto only known t'loni the 

 liatfsford Limestone. Typical spwimeus were found in the present 

 Itoitvs as follows : — 



Bore .-^ 226 feet. Bore 5, ]62-16:3 feet. Bore 11. 440-442 feet- 



Fam. NUMMULINIDAE. 

 Genus POLYSTOMELLA. Lamarck. 



POLYSrOMELLA STKIATOPUNC'I'ATA, F. V. M. .sp , var. KVOLUTA, nOV. 

 (Plate X\M., Fi^r. 9). 



I)('.<rri ptioii. — This variety is vei-y distinct fiom the type-form 

 in having the earlier whorls exposed on tlie umbilical area. The- 

 latter is depressed and wide, eompared with that of the specific 

 form. The retral processes in this variety are strongly developed, 

 and the interspaces, especially on the last whorl, are circular and 

 deep towards the inner boundary of the whorl. 



Diameter of test in figured specimen, .466 mm. 



Ohfier rations. — Typical examples of the species itself are also 

 found in these bores; as, for instance, in Bore 11, 170-175 feet, 

 and in the later deposits, l)ut more spai-ingly than the variety above- 

 described. 



An evolute variety of the above species has lately been described 

 by Messrs. Heron-Allen and Earland, fiom Selsey and Bognor in 

 Sussex, under the varietal name of self<ci/ent<ifi.'^ That variety Avaf, 

 recorded as " both recent and fossil "' (probably pleistocene). It 

 differs from the present evolute variety in liaving an encrustation 

 of redundant shell-growth ovei' the umbilieus, whieh is, moreovei'. 

 not so Avide noi- so deep as in our variety. 



Dhfr;h„f/'o,>.—]inve 9. 26:5-27:'. feet. Bore 10. 160-186 feet ;. 

 195-225 feet; 296-.'?06 feet. 



Genus OPERCULINA. d'Orbigny. 

 ()PKi{(;ULiNA VENOSA, Fichtel and Moll sp. 



yauf>liJ.< i-enoRiix, Fichlel and .Moll. 1798, Test Mier., p. 59 



pi. viii., figs. e-h. 

 Amphinfefpna ciimiiKjii . ( 'aii)eTitei'. 1859, Phil. Trans.. 



p. 32. pi. v., figs. 1:M7. 

 Xiumnvlifes rumi/K/ii. Carp.. H. B. Brady, 1884. Be]). 



Chall., vol. ix.. p. 749, pi. cxii., figs. 11-13, woodcut.. 



fig. 22. 



1. Jouni. R. Micr. Soc, 1909, p. 695, pi. xxi., figs, -ia-e (\ai-. of P. striatojninctata); name jfivem 

 a-* /'. striatopunctata, var. selseyensig, lideni, ibiti, 1911, p. 448 



