716 
Proceedings of the Royal Society 
the “ Porcupine ” dredgings, and often found parasitic upon 
Rliabdammina , occurs in the material from Station D. In 
localities where it is abundant, some of the specimens generally 
present triserial or Verneuiline characters. As it does not appear 
to have been described, I have given it the provisional name, 
T. aspera. 
Cristellaria reniformis , D’Orbigny. — Under this species are 
included a group of large, flat, more or less carinate Cristellarice , 
common at moderate depths in the North Atlantic, presenting 
every variety of contour from Cristellaria compressa , I)’Orb., to 
C. reniformis , D’Orb. (For. Foss. Vien., PI. III. figs. 32, 33 and 
41, 42). 
Globigerina bulloides, var. borealis , nov. — In the fear of intro- 
ducing unnecessary names, I have been unwilling to employ a 
distinctive term for the small thick-shelled Globigerince common 
in cold areas, if not peculiar to them ; and they have been 
treated hitherto as starved examples of the species to which 
they seemed most nearly related from a morphological point of 
view, namely, Globigerina bulloides and Gl. Dutertrei. They 
are, however, very uniform in character, and the more they are 
studied the more distinct and easily recognised they become. 
It seems desirable, therefore, that their peculiarities should be 
embodied in a specific, or at any rate in a varietal, definition. 
The test is of smaller dimensions than G. Dutertrei , the 
longer diameter of fully-grown specimens being about 3 mm. 
(that of the D’Orbignian species is 5 mm.), and it has fewer 
chambers, almost invariably four in the final convolution. 
The shell-wall is relatively much thicker and the aperture less 
conspicuous, but the habit of growth in other respects is very 
similar. Compared with Globigerina bulloides , the shell is 
more compactly built, its segments are less inflated and 
globular, and it has no umbilical vestibule. Under the name 
of “ Globigerina bulloides, arctic variety,” it is figured in the 
Ann. and Mag. Nat. Hist. ser. 5, vol. i. pi. 21, fig. 10. 
Pidvinulina scitida , nov. — A variety of Pulvinulina canariensis, 
differing from the typical form in its relatively small size and 
compact habit of growth. The margin is rounded instead of 
