470 MR. H. B. BRADY ON THE RHIZOPODAL FAUNA OF THE SHETLANDS. 
at a depth of 90 fathoms. A few very fine specimens have been found in the Tertiaries 
of Grignon, but its occurrence in a fossil condition elsewhere has not been noticed. 
Diameter 35 inch. (See Ann. & Mag. Nat. Hist. 2nd ser. vol. xix. p. 294, pl. 10. 
figs. 15 & 10.) 
No. 80. PULVINULINA CONCENTRICA, P. & J., MS. (Plate XLVIII. fig. 14.) 
A variety of P. repanda, F. & M., sp., distinguished by the broad striking bands of 
clear shell-substance overgrowing the septal lines. It is not by any means abundant, 
and, except in two or three instances, the specimens are small. It seems to be common 
in the Mediterranean, where it attains great size and beauty, and it also occurs in the 
Bay of Biscay. Diameter جاو‎ inch. (See Soldani, Testac. pl. 37. fig. B.) 
No. 81. PuLVINULINA KansTENI, Reuss, sp. (Plate XLVIII. fig. 15.) 
Three or four small starved specimens of this species have been pointed out amongst 
my mountings by Mr. Parker. It is almost impossible to distinguish it, in the arrested 
condition here presented, from small specimens of its isomorph Discorbina rosacea, except 
by a comparison of a large series of examples, although when fully developed the two 
forms have striking peculiarities. As I have never met with mature specimens, I can 
only refer to Professor Reuss's memoir on the Chalk of Mecklenburg (Zeitschr. Deutsch. 
Geol. Gesellsch. vol. vii. p. 273, pl. 9. fig. 6), and in this instance I have preferred copying 
his figures of the shell to drawing direct from immature specimens. Diameter 7g inch. 
No. 84. ROTALIA ORBICULARIS, d'Orb. (Plate XLVIII. fig. 16.) 
Although this form was considered by d'Orbigny sufficiently distinct to merit a sub- 
 generie name ( Gyroidina), we cannot regard it as more than a deep-sea variety of Rotalia 
Beccari. It is a thickened, Rotaline form, presenting in profile a trochoid appearance, 
rising to a point on the upper, and very convex on the lower surface. The septal face is 
narrow and shows few or no perforations. A few specimens have been found in soundings 
from the Irish Sea (off Laxey), but it is rare, and the individuals exceedingly small both 
from this and the Shetland locality. The species is common in deep water in the Red 
Sea and in the Mediterranean. Diameter too inch. (D’Orbigny’s * Modèle’ no. 13.) 
No. 85. Trvororus LAEVIS, P. & J. (Plate XLVIII. fig. 17.) 
The specimen of this shell represented in the figure is the only one which I have seen 
from a British locality. It is nearly globular and a good deal worn, and might easily in 
this condition be mistaken for a large grain of sand ; a little observation, however, shows 
on its surface the obscure and more or less hexagonal markings caused by the promi- 
nence of the septal edges. The specimen is exceedingly small when compared with those 
of tropical origin, being not more than 3o inch in diameter. 
the species of the genus Tinoporus are found in greater abundance in the seas of‏ للق 
warm than in those of colder regions, though the small spherical variety now under‏ 
notice has a wider geographical range than the larger forms which exist in such abun-‏ 
dance amongst the coral-reefs of Polynesia. Mr. Parker notes the occurrence of 1١ 8‏ 
