170 
THE VOYAGE OF H.M.S. CHALLENGER. 
Miliolina labiosa, d’Orbigny, sp. (Pl. VI. figs. 3-5). 
Triloculinci labiosa, d’Orbigny, 1839, Foram. Cuba, p. 157, pl. x. figs. 12-14. 
The Triloculina labiosa of d’Orbigny embodies a group of Miliolce presenting 
somewhat anomalous characters. The segments are few in number, inflated, and 
irregularly disposed ; the aperture is arched or crescentiform, and has a thickened lip. 
Such forms furnish the connecting links between Miliola and Nubecularia. The less 
irregular varieties show a tendency to become more and more definitely Milioline in the 
arrangement of their segments, and can scarcely be distinguished from Miliolina 
subrotunda ; whilst the most aberrant are only separable from Nubecularia injlata by 
the possession of a single terminal aperture in place of numerous orifices scattered over 
the body of the shell. 
But perhaps the most interesting point in connection with this species is the 
occurrence of specimens, especially of the more regular varieties approaching Miliolina 
subrotunda in contour, in the deepest water of the North Pacific. As has been already 
stated, the Milioline shells obtained from the abyssal area are usually extremely thin, 
insomuch that they occasionally collapse on being taken out of fluid and allowed to dry ; 
and in some instances they are so completely siliceous that they bear the action of 
strong acids without alteration. In such cases the texture is homogeneous and trans- 
lucent, and scarcely differs in appearance from the young condition of a porcellanous 
shell. 
I have note of the occurrence of Miliolina labiosa at sixteen Challenger Stations, of 
which seven are in the deep area of the North Pacific already referred to, the depth 
ranging from 2050 to 3950 fathoms : the remainder are chiefly in shallow water at 
various points of the southern hemisphere. A striate variety of the species is found on 
the shores of Ceylon. 
Miliolina bucculenta, n. sp. (Pl. CXIV. fig. 3, a.b.). 
Miliola ( Triloculina ) cryptella, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 410, pl. xv. 
39, a.b. 
Test subglobular, more or less compressed, the two sides nearly symmetrical, margin 
tabulated; segments inflated, broad and embracing, the last three forming a single 
convolution, which completely encloses the preceding ones. Aperture a long, irregularly 
arched, transverse slit, on the face of the terminal segment, near the line of union with 
the previous convolution. Diameter, T ^th inch (2 mm.). 
This is a somewhat anomalous species in whatever light it is regarded. It is a 
Triloculine Miliola, with a planospiral manner of growth ; or a Plctnispirina without the 
alar flaps which cause the lamination of the shell characteristic of that genus ; or a swollen 
Hauerina without a cribrate aperture. Its nearest allies, however, appear to be such 
