EOEAMINIEEEA EEOM THE NORTH ATLANTIC AND AECTIC OCEANS. 367 
The chamber-walls attain their greatest thickness in those close-set and rough-shelled 
varieties which occur in great abundance at from 1600 to 2400 fathoms in the North 
Atlantic, between Ireland and Newfoundland (Plate XVI. fig. 15 ; and Professor Huxley’s 
plate in the Admiralty Report on the Telegraph-soundings in the North Atlantic), and 
at lat. 5° 37' S., long. 61° 33' E. in the Indian Ocean (2200 fathoms). These are the 
nearest isomorphs of Sphceroidina dehiscens , Parker and Jones, Plate XIX. fig. 5, which is 
found with them in the tropical parts of the Atlantic and in the Indian Ocean, and not 
in the North Atlantic. Those smooth forms ( Gl. infiata , D’Orb., from the Canaries) having 
moderately thick chamber-walls, and which are nearest to Pullenia in style of growth, 
abound in the North Atlantic (Plate XVI. figs. 16, 17), and are very plentiful in the 
Southern Mediterranean, at about 700 fathoms, and in the Indian Ocean, lat. 36° 58' S., 
long. 51° 49' E. (900 to 1120 fathoms). Gl. bulloides is small and very abundant at 2700 
fathoms in the South Atlantic ; the greatest depth for its habitat that we know of. 
The complanate form of Globigerina, with more or less limbate septal lines, is figured 
by D’Orbigny, as living on the coast of Cuba, with the name of Bosalina Linnwi (Foram. 
Cuba, pi. 5. figs. 10-12). It is common in the Chalk, and is known as Bosalina margi - 
nata, Reuss (Charakt. Kreid. Ostalpen, Henksch. Akad. Wien, vii. pi. 26. fig. 1), and 
Bosalina canaliculata , Reuss (Ibid. fig. 4). 
Plate XIV. figs. 1 & 2 represent specimens obtained at three places among the Hunde 
Islands by Dr. P. C. Sutherland (28-30, 30-40, and 60-70 fathoms), rather common 
and small ; and others found (rare and very small) in the most northern soundings we 
have examined, namely, Baffin’s Bay, lat. 76° 30' N., long. 77° 52' W. (Parry) at 150 
fathoms; and others from the coast of Norway, few and small in the mixed sands 
(MacAndrew and Barrett). 
In the North Atlantic Globigerina bulloides , including its variety Gl. infiata , D’Orb. 
(Plate XVI. figs. 16, 17), is spread broad-cast ; but is abundant and of good size only at 
the greater depths (“Virginian Province,” and the “Celtic” and “Boreal ” abyssal areas, 
at upwards of 2000 fathoms in some places), and at 223, 338, and 415 fathoms on the 
eastern marginal plateau : elsewhere on this plateau it is small and varying in numbers. 
On the western plateau (north of the Bank of Newfoundland) it is small, though some- 
times common ; whilst in Trinity Bay it is very small and very rare. 
The oldest known Globigerince are those in the Gault. 
Globigerina bulloides , Var. infiata , D’Orbigny. Plate XVI. figs. 16,17 (North Atlantic). 
In this Globigerina (For. Canar. p. 134, pi. 2. figs. 7-9), peculiar for its large gaping 
aperture, the newer chambers are relatively larger than usual, and cover the former ones 
to a great extent (see figs. 16, 17). It is variable in its details, and does not differ 
specifically from Gl. bulloides. It has already been referred to above (page 365). 
This variety abounds and is large on the North Atlantic, and on deep muddy bottoms 
in the Mediterranean (Dayman’s soundings). Professor Bailey noticed it in soundings 
from off the Coast of New Jersey (see Appendix). D’Orbigny had it from the Canaries; 
it is plentiful in the Indian Ocean (see above). 
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