REPORT ON THE FORAMINIFERA. 
537 
Cristellaria wetherellii, Jones, sp. (PL CXIV. fig. 14). 
Marginulina , sp., Sowerby, 1834, Trans. Geol. Soc. Loncl., ser. 2, vol. v. p. 135, pi. ix. fig. 12. 
,, wetherellii, Jones, 1854, Morris’s Cat. Brit. Foss., p. 37. 
„ „ Parker and Jones, 1859, Ann. and Mag. Nat. Hist., ser. 3, vol. iv. p. 350. 
,, frag aria, Giimbel, 1868, Abhandl. d. k. bayer. Akad. d. Wiss., II. Cl., vol. x. 
p. 635, pL i. fig. 58, a.b.e. 
Cristellaria asperula, Id. Ibid. pi. i. fig. 65, a. b. 
,, arcuata, Hantken, 1875, Mittheil. Jabrb. d. k. ung. geol. Anstalt, vol. iv. p. 51, 
pi. v. fig. 10. 
„ fragaria, Id. Ibid. p. 53, pi. vi. figs. 1-3. 
Amongst the numerous old friends that have turned up under new conditions during 
the investigation of the Challenger material, there are few that it has been a greater 
pleasure to meet with than this handsome and striking species, so familiar as a London 
Clay fossil. 
The test of Cristellaria wetherellii is usually pod-like or crosier-shaped, but varies 
greatly in length and in the relative development of the spiral and linear portions. It is 
however always more or less spiral at the commencement, and almost invariably exhibits 
considerable lateral compression ; therefore, so far as such characters are of any distinctive 
'value, it belongs to the genus Cristellaria rather than to Marginulina. The salient feature 
of the species is its peculiar surface-decoration, consisting of closely-set raised tubercles, 
which take the place of continuous limbate septal lines. These are often, but not 
invariably, connected by slight, oblique, longitudinal costse, most apparent on the earlier 
portions of the shell. 
There are several figured varieties, besides those enumerated in the above synonymy, 
which cannot be separated from the present species by any valid zoological characters. 
Of these, Cristellaria decorxtta, Reuss (Zeitschr. d. deutsch. geol. Gesellsclu, vol. vii. 
p. 269, pi. viii. fig. 16, pi. ix. figs. 1, 2), which differs in little beyond its slightly carinate 
margin; and Marginulina hochstetteri, Stache (Novara.-Exped., geol. Theil, vol. i., Palaont., 
p. 221, pi. xxii. fig. 55), which is represented by a nearly straight Vaginulina- like shell 
with the tubercles well developed but without costae, are good examples, and there are 
many others which display similar surface-ornament but more nearly resemble the typical 
involute Cristellarians in their mode of growth. 
Somewhat damaged recent specimens of Cristellaria ivetherellii have been obtained 
at two Challenger Stations, namely : — off Raine Island, Torres Strait, 155 fathoms ; and 
off the coast of South America, south-east of Pernambuco, 350 fathoms. 
As a fossil the species dates back at least as far as the early part of the Tertiary 
epoch, if not to the Cretaceous formations. It is common in the London Clay (Jones 
and Parker, Brady), and occurs also in the Nummulitic Marl of the Bavarian Alps 
(Giimbel), in the Clavulina-szaboi beds of Hungary (Hantken), and probably also in 
similar deposits of later geological age. 
