Foraminif era of the Gault of Folkestone. By F. Chapman. 45 
on the North German Gault Foraminifera, and was clearly demonstrated 
by M. Berthelin in his comparisons between the Rhizopodal faunas of 
the several geographical areas. The Nodosarise which I have found only 
in the Lower Gault are N. sceptrum Reuss and N. ( D .) xiphioides Reuss ; 
whilst those peculiar to the Upper Gault are N. (6?.) cylindracea Reuss, 
N. radicula ( L .) var. Jonesi Reuss, N. ( D .) farcimenBe uss, N. (Z>.) soluta 
Reuss, and its variety pulchella nov., N. ( D .) costellata Reuss, and 
N. (D.) raristriata nov. The Frondicularise are not very conspicuous 
before zone v. is reached ; at zone x. they approach the maximum, 12 
species being there found out of a total of 17 species. Bkabdogonium 
begins to make its appearance in zone ix., and two of the forms continue 
to the top. Narginulina is well represented by M. debilis Berth., which 
begins in zone iii. and continues to the top of zone xi. at 25 ft. down ; 
also M. sequivoea Reuss, with a somewhat extensive range, and the allied 
forms M. striatocostata Reuss and M. Jonesi Reuss. The more conspicu- 
ous forms of Vaginulina as regards abundance are V. recta Reuss, extend- 
ing throughout, with its variety tenuistriata nov., commencing at zone 
v., V. truncata Reuss with its variety robusta Berth, and Chap., and 
V. gaidtina Berth., the last-named extending from zones iii. to xi. The 
genus Cristellaria comprises 39 forms, many of which are found only 
sparingly at various levels in the Gault ; but several species call for 
special remark. Of the ensiform or elongate Cristellarise , C. Bononiensis 
Berthelin is perhaps most frequently met with. On the other hand, 
those of the C. rotulata type are often exceedingly common, and as a 
rule are generally distributed. Three species, viz. C. rotulata Lam. sp., 
C. gaultina Berthelin, and C. diademata Berthelin, occur.in all the zones 
of the Gault, although not in every level examined. The Polymorphinse , 
rilthough found sparingly in the Lower Gault, beginning at zone iii., 
find their particular habitat in the three upper zones. Of the two species 
of Sagrina, S. asperula nov. is restricted to zones i., iii., v., and vii., 
whilst S. calcarata Berth, sp. was found only in zones xi. and xiii. The 
Bamulinse are sparingly found in the Lower Gault, but attain to some 
abundance on reaching zone xi. The remarkable form B. cervicornis 
CLapman sp. is found attached to shell-fragments, and appears to be 
frequent wherever there are shelly bands in the Gault clay. Vitri- 
ivebbina is represented by 3 species and 1 variety, two of which, 
V. Sollasi and its variety gonoidea nov., have been newly described from 
the Gault. 
The Family of the Globigerinidse is an important one on account of 
the great abundance of one of its species, G. cretacea d’Orb., which is 
found in all zones and at all the levels with two exceptions. From 
zone i. this species progressively increases in abundance to zone xi., 
.and then slightly diminishes to the top of the Gault. At no level is 
G. bulloide8 d’Orb. so abundant as the preceding species, although it 
is common at the top of zone xi., and the top of zone xiii. Sphseroidina 
is represented by S. bulloides d’Orb., of which only one specimen was 
found, in zone v. 
Of the Family of the Botaliidse, Spirillina has only one species, S. 
tuberculata Brady, which was found only in zone viii. The Discorbinse , 
as might be expected from deposits of a more or less shallow-water 
