154 FORAMINIFERA OF THE CRAG. 



The bold, coarse-shelled Tc.rfilarite with gibbose or subglobular chambers, and 

 of somewhat irregular growth, commoner as Tertiary fossils than in the recent 

 condition, form a natural group between the more delicate and regular T. globulosa, 

 Ehrenberg, and the thick and coarse forms of T. agglutinans. 



It is not uncommon to meet with specimens in which the chambers are sub- 

 divided into chamberlets, as shown in two of our figures (PI. Ill, fig. 12, and PL V, 

 fig. 13). Another but much less frequent variation from the normal habit is repre- 

 sented in the double shell found in one of the Sutton gatherings, PI. Ill, fig. 13. 



T. gibbosa has many analogues in the sharp-edged forms known as T. sub- 

 angulata } gramen, and abbreviata, d'Orb., and their numerous allies. These become 

 gibbosa by being less compressed, their chambers sloping less, and their lateral 

 edges more rounded. 



Bigenerina patula, Brady, 1876, ' Monogr. Carb. Perm. Foram.,' p. 136, pi. viii, 

 figs. 10, 11, and pi. x, figs. 30, 31 (afterwards Climacammina, in Uteris), is a 

 bigenerine gibbosa, with its chambers subdivided into labyrinths. 



About fourteen fossil specimens of Textilaria gibbosa, d'Orb., are figured in 

 Ehrenberg's memoirs under various names ; see ' Ann. Mag. Nat. Hist.,' ser. 4, 

 vols, ix and x, 1872, especially p. 456; and occasionally Ehrenberg illustrated 

 recent specimens, op. cit., pp. 222 and 254. 



Occurrence. — Textilaria gibbosa. No recent specimen of this form is recorded in 

 the ' Challenger ' Report, but it is noted (' Quart. Journ. Geol. Soc.,' vol. xvi, 1860, 

 Table, p. 302) as occurring at Venice (on the Lido) and at Rimini (Adriatic). Fossil 

 specimens have been found in the Gault of Folkestone, in the White Chalk, the 

 Miocene of Vienna, of Malaga, and of Muddy Creek (Victoria) ; the older Tertiaries 

 of South Australia (Howchin), and the Helvetian of Italy (de Amicis). In the 

 Coralline Crag T. gibbosa is one of the commonest and best developed of the 

 Textilariinse. The specimens obtained from Sutton, zone f, and Sudbourne Hall, 

 zone d, are particularly fine. 



8. Textilaria tuberosa, cVOrbigmj, 1826. PI. V, fig. 17. 



Polymorphum janiforme, 1 Soldani, 179S Testaceogr., &c, vol. ii, pp. 39 and 45, 



pi. xiv, fig. h. 



1 Amoug the many misprints in d'Orbigny's " Tableau methodique," &c, in the ' Ann. Sei. Nat.,' 

 vol. vii, the reference at p. 2(53 to " Sold. 4, p. 39, Tab. 14, fig. II, Polymorphium [sic] tuberosum" is 

 one of the must misleading.^ The "Polymorpha tuberosa" of vol. i, part 3, p. 39, are described by 

 Soldani as figured under "f, y," in pi. xiv, from the vase exxvi : fig. h, of pi. xiv, from the vase 

 exxvii, and referred to by Soldani, at pp. 39 and 45, as one of the " jauiformia," is evidently the one 

 quilted by d'Orbigny as "fig. //," and named by him Text, tuberosa under a mistake, and without 

 carefully reading the text. 



