638 
THE VOYAGE OF H.M.S. CHALLENGER 
annuli, but more frequently disposed without apparent order. Shell-wall coarsely 
porous ; aperture consisting of a number of larger perforations along the lines of the 
inferior sutural depressions. Colour, in fresh shells, brown near the centre of the 
superior face, gradually lighter towards the circumference. Diameter, ^Lth inch (l mm.). 
This is a very distinct variety, bearing something like the same relation to the typical 
Cymbalopora poeyi that Planorbulina mediterranensis bears to Truncatulina lobatula. 
It possesses additional interest on account of the character of the aperture, w T hich 
resembles that of Candeina nitida — rows of sutural pores taking the place of the normal 
umbilical orifices — one of the features, before alluded to, which suggest the near affinity 
of the genus to the Globigerinida:. 
Cymbalopora tabellceformis is, like its congeners, a coral-reef species. The finest 
specimens hitherto obtained have been from shore-sands collected at Tamatave, on the 
east coast of Madagascar, and it has also been found in harbour-mud from Port 
Louis, Mauritius. It is common in the neighbourhood of the Fiji Islands, at various 
depths from 1 2 fathoms to 6 1 0 fathoms ; and has been noticed in dredged sands from the 
Ki Islands, 129 fathoms, the Philippine Islands, 95 fathoms, and the Sandwich Islands, 
40 fathoms. 
Cymbalopora ( Tretomphalus ) bulloides, d’Orbigny, sp. (PI. CII. figs. 7-12). 
Rosalina bulloides, d’Orbigny, 1839, Foram. Cuba, p. 104, pi. iii. figs. 2-5. 
Cymbalopora bulloides, Carpenter, 1862, Introd. Foram., p. 216. 
,, „ Brady, 1879, Quart. Journ. Micr. Sci., vol. xix., N. S., p. 80. 
Tretomphalus bulloides, Moebius, 1880, Foram. von Mauritius, p. 98, pi. x. figs. 6-9. 
The salient feature of Cymbalopora bulloides is the large inflated chamber which forms 
the base of the shell, and constitutes the greater part of its entire bulk. In its earlier 
stage the test is Eotaliform, the superior side convex, the inferior concave ; the segments 
are arranged in about three convolutions, and, but for a certain irregularity in the disposi- 
tion of the later whorls, it might in this condition be mistaken for one of the weaker 
modifications of Discorbina. The inferior side of the Eotaliform shell has an umbilical 
depression, round which the segments are arranged and into wEich they open, and the 
intervals between the chambers form radiating fissures. In all these points the initial 
test resembles the typical Cymbalopora poeyi ; but the general contour is more outspread 
and the umbilical recess remains open, not being covered by a shelly flap, as is usual with 
the latter species. The peripheral margin of the Eotaliform test forms the line of attach- 
ment of the large balloon-like chamber which envelops the whole of the inferior side. 
The distal face of the “ balloon” is decked with a number of large Orbuline pores, the 
margins of which have generally a slight rim or border (fig. 12). Moebius has pointed 
out that one of the pores near the centre of the disk is furnished with a short tube, pro- 
