REPORT ON THE FORAMINIFERA. 
171 
forms as Triloculina circularis, Bomemann, and Triloculina valvularis, Reuss, and it 
presents fewest difficulties treated as an aberrant modification of Miliolina. Parker and 
Jones (Joe. cit.) figure an arctic specimen with almost identical characters under the name 
Miliola ( Triloculina ) cryptjdla. But the Triloculina cryptella of d’Orbigny (Foram. 
Amer. Merid., p. 70, pi. is. figs. 4, 5) appears to be a very distinct form, the shell of 
which, though subglobose in contour, is constructed on the normal Milioline plan, 
two segments to each convolution ; I have therefore included the specimens referred 
to in the present species. 
I am only aware of the occurrence of the typical Miliolina bucculenta at three 
localities, all of them in the North Atlantic. The figured shell is from the Faroe 
Channel, 630 fathoms, Messrs. Parker and Jones’s specimens were from Baffin’s Bay, and 
in the Rev. A. M. Norman’s cabinet there are excellent examples dredged during the 
“Valorous” Expedition, 1785 fathoms. 
Miliolina bucculenta, var. placentijormis, nov. (PI. IV. figs. 1,2). 
Test asymmetrical ; irregularly oval or nearly circular in contour, much compressed ; 
peripheral edge thick and rounded. Segments broad, irregular, and embracing ; the 
final convolution, consisting of two to three chambers, entirely enclosing the preceding- 
whorls. Aperture either a long, narrow, curved, transverse slit, or a crescentic opening- 
near the inner margin of the last segment. Longer diameter, T ^th inch (2 mm.). 
This variety differs from the typical form in its general asymmetry, its flattened 
contour, and the irregularity of the shape of its segments. The ultimate segment 
occupies about one-half of the visible shell, the penultimate about three-fourths of the 
remainder, whilst the antepenultimate is but little exposed owing to the partial overlap 
of its predecessors. 
Miliolina bucculenta, var. placentiformis, has been collected in two localities, namely, 
off Culebra Island, West Indies, 390 fathoms ; and Balfour Bay, Kerguelen Islands, 
20 to 50 fathoms. 
Miliolina bicornis, Walker and Jacob, sp. (PI. VI. figs. 9, 11, 12). 
“ Serpula bicornis ventricosa,” Walker and Boys, 1784, Test. Min., p. 1, pi. i. fig. 2. 
“ Frumentaria/ce7wc2iZM?n,” Soldani, 1795, Testaceograpbia, vol. i. part 3, p. 229, pi. cliv. figs. bb. cc. 
Serpula bicornis, Walker and Jacob, 1798, Adams’s Essays, Kanmacber’s ed., p. 633, pi. xiv. fig. 2. 
Triloculina brongniartii, d’Orbigny, 1826, Ann. Sci. Rat., vol. vii. p. 300, No. 23. 
Quinqueloculina guancha, Id. 1839, Foram. Canaries, p. 143, pi. iii. figs. 34-36. 
,, flexuosa, Id. 1839, Foram. Amer. M4rid., p. 73, pi. iv. figs. 4-6, 
„ striolata, Renss, 1849, Denkschr. d. k. Akad. Wiss. Wien, vol. i. p. 385, pi. 1. fig. 
10, a.d. 
„ affinis, Costa, 1856, Atti dell’ Accad. Pont., vol. vii. p. 329, pi. xxv. fig. 13. 
