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Transactions of the Society. 
fragmentary condition, tlie branching habit of growth rendering them 
extremely liable to fracture. In a few instances the commencing 
segments have been found ; they consist of a pyriform or globular por- 
tion internally septate somewhat after the manner of Polymorphina, 
which subsequently gives rise to one or more tubular extensions, 
they in turn bearing other inflated segments ; this alternating growth 
apparently extending to a remarkable degree. B. aculeata is perhaps 
as abundant as the preceding form in the Gault series, but it pre- 
dominates, to the exclusion of other types, in the Upper Chalk series. 
B. aculeata is known from the Jurassic strata of Switzerland 
(Hausler) ; the Gault of England (Williamson and Kupert Jones) 
and Switzerland (Hausler) ; the Red Chalk of Yorkshire (Burrows, 
Sherborn, and Bailey) ; the Cenomanian of Bohemia (Perner) ; the 
Chalk-marl of Kent (Kupert Jones) ; the Upper Chalk of Ireland 
(Wright) and of Aix-la-Chapelle (Beissel) ; the Tertiaries of the 
Paris Basin (Parker and Jones), of Italy (De Amicis and Terrigi), 
and of Austria (Rzehak). 
In the Gault of Folkestone B. aculeata was found in zone iv., 
rare ; zone x., very rare ; zone xi., 55 ft. from the top, common ; 
50 ft., common ; 45 ft. common ; 40 ft., rare ; 35 ft., very rare ; 
30 ft., rare ; 25 ft., frequent ; 20 ft., rare ; 12 ft., common ; 6 ft., 
frequent. 
Bamulina cervicornis Chapman sp., plate XII. figs. 10, 11. 
Polymorphina Orbignii Zborzewski sp. var. cervicornis Chapman, 
1892, Geol. Mag. Dec. III. vol. viii. p. 54, plate ii. figs. 5, 6. 
Test always adherent, shell-surface smooth, usually found attached 
to shell-fragments. It commences with a compressed polymorphine 
series elliptical in outline, followed by extensive prolongations given 
off usually from one end of the initial portion (the apical end) but 
sometimes from both ends ; these prolongations, in turn, branch off 
at intervals and on each side of the main stem, and the ends of the 
main branches terminate in bifurcations, after the manner of a stag’s 
horn. Apertures at the pointed extremities of the branchlets. Shell- 
structure finely perforate. 
Various stages of this remarkable Foraminifer were found, from 
the commencing series (a polymorphine bud, so to speak) to the 
examples having enormously developed cervicorn outgrowths. 
It is just possible that Terquem’s Placopsilina rhizomorplia * 
and more especially P. cornuta f are related to this form, but 
there is a difficulty in drawing comparison between these Liassic forms 
and those from the Gault, seeing that the shell-structure of the former 
specimens is not clearly defined in the descriptions. It is interesting, 
however, to notice the similarity in the habit3 of growth of the 
* Cinquieme Memoire sur les Foraminiferes du Lias,’ &c., Metz, 18G6, p. 422, 
pi. xvi. figs. 3a-/. f Op. cit., Sixiemo Memoire, p. 491, pi. xx. figs. 8-21. 
