REPORT ON THE FORAMINIFERA. 
643 
flat base and coarsely perforated walls. The valvular flaps form a sort of stellate sutural 
limbation on tbe inferior face. 
Good examples have been found in the material dredged at four Challenger Stations : — 
off St. Vincent, Cape de Verde Islands, 11 fathoms (large and well-characterised); off 
Ascension Island, 420 fathoms (small); off the coast of South America, near Pernam- 
buco, 350 fathoms; and Port Jackson, Australia, 2 to 10 fathoms. I have also 
specimens from the coral-sands of Bermuda; from Port Stephens, New South Wales; 
and elsewhere. 
Discorbina turbo occurs in the Chalk of Maestricht (Parker and Jones) ; and it is a 
prominent species amongst the fossil microzoa of the Eocene formations of Paris. 
Discorbina globularis, d’Orbigny, sp. (PI. LXXXVI. figs. 8, 13). 
Rosalina globularis, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 271, pi. xiii. figs. 1-4; — Modele, 
No. 69. 
„ varians, Schultze, 1854, Organ. Polytbal., p. 60, pi. iii. figs. 8-13. 
Rotalina semiporata, Egger, 1857, Neues Jahrb. fur Min., &c., p. 276, pi. viii. figs. 1-3. 
„ concamerata (young), "Williamson, 1858, Rec. For. Gt. Br.,p. 53, pi. iv. figs. 104, 105. 
Discorbina turbo, var. globularis, Parker and Jones, 1862, Introd. Foram., Appendix, p. 311. 
,, „ var. vesicularis, subvar. globularis, Id., 1865 ; Phil. Trans., vol. civ. p. 386, 
pi. xiv. figs. 22, 23. 
„ globularis, Parker, Jones, and Brady, 1865, Ann. and Mag. Nat. Hist., ser. 3, 
vol. xvi. p. 30, pi. ii. fig. 69. 
Discorbina globularis is the commonest and most widely-diffused member of the 
genus. The figured specimens are not quite typical, the test being seldom so large or so 
thick- walled, whilst the segments are usually more globular and projecting, and the 
sutures depressed and without external limbation. Several of the figures referred to in 
the synonymy are more characteristic of the species. The shell is often found attached 
to Algae, Polyzoa, and like objects. 
Discorbina globularis is plentiful in the shallower zones of temperate and sub-tropical 
seas, less frequent within the tropics. Its geographical range extends from about the 
Arctic Circle (Davis Strait and the coast of Norway), on the north, to Magellans Strait 
on the south. It is abundant at depths of less than 50 fathoms, and becomes gradually 
scarcer down to about 450 fathoms, beyond which it has not been obtained. 
The species has been recognised in the fossil state as far back as the Eocene deposits 
of Grignon ; and it occurs in many subsequent formations, such as the Miocenes of 
Lower Bavaria and Southern Italy (Egger, Seguenza), the Pliocene of Italy and of the 
Island of Rhodes (Seguenza, Terquem), and the Post-tertiaries of the British Islands, Italy, 
and elsewhere. 
