FORAMINIFERA FROM THE NORTH ATLANTIC AND ARCTIC OCEANS. 
375 
to interdigitate or to be intercalated. Bulimina elegantissima , D’Orb., For. Amer. 
Merid. p. 51, pi. 7. figs. 13, 14, and Bobertina arctica , D’Orb., For. Foss. Yien. p. 203, 
pi. 21. figs. 37, 38, both belong to this group of Bulimince (see Carpenter’s Introd. 
Foram. p. 195, &c.), and the differences of modification are so slight that we include the 
latter in the former. 
Our Arctic specimens of B. elegantissima are relatively large in size and thin-walled. 
In the Indian seas B. elegantissima occurs smaller, and with thicker walls ; but from 
the Australian seas we have it more elongate and stronger than the Arctic form. The 
elongate form is found also on the British coasts (see Williamson’s 4 Monograph,’ p. 64, 
pi. 5. figs. 134, 135). B. elegantissima occurred to D’Orbigny in the sea-sands from the 
Pacific coast of South America; and he had Bobertina arctica from the North Cape. 
B. elegantissima is rare and of middling size at 25-30 fathoms, and common and large 
at from 30-70 fathoms, at the ITunde Islands (Dr. P. C. Sutherland’s dredgings). 
It is fossil at Grignon; also in the Eocene sandy clays of Hants and Isle of Wight 
(FI. B. Brady), and in the Pliocene clay under the fens near Peterborough. In the 
recent state it is world-wide, — the British coasts, the Mediterranean, Bed Sea, Tropical 
Atlantic, Australia, and Fiji. 
Bulimina Presli, Beuss, Var. ( Virgulina ) Schreibersii , Czjzek. Plate XV. fig. 18 
(Arctic); Plate XVII. figs. 72, 73 (North Atlantic). 
Virgulince are such Bulimince as are very much outdrawn, with thin shells, and having 
long loop-like apertures, with inverted lips, as in Bulimina proper. The chambers are 
arranged less compactly than in the other Bulimince , in consequence of the elongation of 
the shell, and are scarcely more than biserial, or even only irregularly so. V. Schreibersii, 
Czjzek, Haid. Abhandl. vol. ii. pi. 12. figs. 18-21, is of irregular growth, intermediate 
between the long and loose-growing varieties of B. ovata, D’Orb., and the Textulariform 
Virgulina squamosa, D’Orb., next described. It is an isomorph of Polymorpliinci, as 
V. squamosa is isomorphic with Textularia. 
We have it rare and large from the Hunde Islands, where Dr. Sutherland dredged it 
in 30-40 fathoms; and in the North Atlantic it is rare and middle-sized at 1950 
fathoms; rare and large at 2330 fathoms (Boreal portion of the Abyss); and rare and 
small at 954 and 725 fathoms north of Newfoundland Bank. 
V. Schreibersii and its subvarieties are not rare in existing seas, both of warm and cold 
climates ; and it occurs fossil in the Tertiary beds of Sienna, Vienna, and Turin. 
Some allied forms occur in the Chalk and in the Clays of the Oolite, which are 
isomorphs of the Dentaline or Virguline Po lymorp hi n ce of the Sutton Crag. 
Bulimina Presli, Beuss, Var. ( Virgulina ) squamosa, D’Orbigny. Plate XV. fig. 19 a, 
19 b, 20 (Arctic). 
Although the arrangement of the chambers has become almost regularly biserial, and 
alternate, as in Textularia , yet this variety retains the true Bulimine aperture; and 
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