REPORT ON THE FORAMINIFERA. 
541 
Giimbel lias pointed out ( loc . cit.) tlie close resemblance of Reuss’s species to the form 
described by himself under the name Cristellaria truncana ; and I may add that after a 
careful comparison of the various figures with each other and with the recent specimens, 
I have been unable to recognise any character by which the two can be distinguished. 
Cristellaria tricarinella has been collected at three localities, amongst the islands 
of the Western Pacific, as follows : — off the Philippine Islands, 95 fathoms ; off Raine 
Island, Torres Strait, 155 fathoms ; and off the west coast of New Zealand, 150 fathoms. 
Reuss records the presence of the species as a Cretaceous fossil in the Hilstlion and 
Speeton-clay of North Germany ; and Giimbel’s specimens were from the Nummulitic 
Marl (Eocene) of the Gotzreuther Graben, Kressenberg, Bavaria. 
Cristellaria siddalliana, H. B. Brady (PI. LXYIII. figs. 5-9). 
Cristellaria siddalliana, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 64. 
Test spiral, explanate, with a tendency to become centrifugal or crosier-shaped ; ex- 
tremely thin ; surrounded by a broad delicate wing, except the septal front of the ter- 
minal segment, or, in crosier-like specimens, the ventral margin of the projected chambers ; 
the wing often extending between and separating the last two convolutions of the discoidal 
portion. Segments numerous, very slightly inflated, forming two to three convolutions, 
the whole of which are visible on both sides of the shell. Longer diameter, inch 
(1'26 mm.) or more. 
This beautiful and very distinct species cannot be more fitly named than after a 
naturalist who has done so much good service to science as my friend Mr. J. D. Siddall 
of Chester. 
It has only been found at a single locality, — off Kandavu, Fiji Islands, depth 210 
fathoms. 
Cristellaria variabilis, Reuss (PI. LXVIII. figs. 11-16). 
Cristellaria variabilis, Reuss, 1849, Denkschr. d. k. Akad. Wiss. Wien, vol. i. p. 369, pi. xlvi. 
figs. 15, 16. 
„ peregrina, Scliwager, 1866, Novara-Exped., geol. Tlieil, vol. ii. p. 245, pL vii. 
fig. 89. 
The drawings of this species (figs. 11-15) illustrate the curious mutations in form 
which take place during the growth of the test. Had space permitted, it would have 
been easy to introduce a more complete series, but these few figures are sufficient to 
indicate in a general way the successive stages through which the little orbicular 
organism (fig. 11) passes, before assuming the elongate and carinate aspect of the 
typical adult shell. They serve also to show the connection between two forms, 
(ZOOL. CHALL. EXP. PART XXII. 1884.) Y 69 
