REPOET ON THE EORAMINIFERA. 
437 
clips towards the middle of the test on the dorsal side, so that more of the penultimate 
segment is exposed on that side than on the other. The aperture is a curved fissure, 
sometimes bordered by a thickened lip, and always situated on the ventral side, at the 
margin of the final segment. The shape of the test varies from an elongate or subcylin- 
drical, to a short and rounded oval, between which extremes every gradational form 
may be met with ; its texture is delicately thin and porous. 
The series of drawings, PL LV. figs. 12-20, sufficiently indicates the variability of the 
species in point of external contour, as well as the diversity in the size and shape of the 
aperture. Figures 21 and 22 are thin-shelled specimens, mounted in Canada balsam 
and viewed by transmitted light, to show the arrangement of the chambers in the 
interior ; and fig. 23 represents a shell with the outermost chamber broken, so as to 
expose the penultimate segment in its natural position. 
It is somewhat remarkable that Chilostomella ovoidea, which is now known to be 
distributed over a very wide geographical area, and to be an exceedingly common species 
in many localities, should not have been found, or at any rate not have been recognised, 
as a recent Foraminifer, until six or seven years ago. It does not occur amongst the 
fossils of our native microzoic deposits, and before its discovery by the Rev. A. M. Norman 
in sands dredged off the south-west of Ireland, and amongst the material collected in the 
North Atlantic during the cruise of the “ Valorous,” the type was practically unknown to 
English Rhizopodists. 
Mr. Norman informs me that the species is abundant on the coast of Norway, in the 
neighbourhood of Bergen, at depths of from 100 to 200 fathoms. It has been collected 
on the west coast of Ireland, 112 fathoms ; in Vigo Bay, 11 fathoms ; and at ten other 
localities in the North Atlantic, at depths ranging from 90 to 1350 fathoms. In the South 
Atlantic it is almost entirely wanting, having only been met with at a single point, just 
south of the equator, 2350 fathoms. The distribution-list further includes twelve Stations 
in the South Pacific, 150 to 1875 fathoms, and six in the North Pacific, 95 to 3125 fathoms. 
The occurrence of Chilostomella ovoidea in the fossil condition appears to be confined 
to the Tertiary epoch. It has been found in the Septaria- clays of Hermsdorf, Freienwalde, 
Pietzpuhl, and Stettin, in North Germany (Reuss, Bornemann, Schlicht), in the Clavulina- 
szaboi beds of Hungary (Hantken), in the Salt-clay of Wieliczka in Galicia (Reuss), in 
the Miocene of various localities in the neighbourhood of Vienna (Reuss, Karrer), and in 
the Miocene and Pliocene deposits of Calabria (Seguenza). 
Allomorjohina, Reuss. 
Allomorjphina, Reuss [1849], Karrer, Brady, Biitsclili. 
The genus Allomorjphina differs from Chilostomella chiefly in the mode in which the 
segments are combined. The test, instead of being uniaxial, with the segments put on 
(ZOOL. CHALL. ESP. PART XXII. 1884.) Y 56 
