1896. FORAMINIFERA OF THE CHALK. 103 



Hume to Culebra Island. For instance, we have ourselves found it 

 abundantly in soundings from the Holothuria Banks off the north- 

 west coast of Australia. It may further be mentioned that specimens 

 have also been recorded from several zones of the Coralline Crag of 

 the east of England. 1 



2. Gaudryina pupoides, again, is by no means characteristic of 

 localities such as Culebra Island. The " Challenger " Report states 

 it to be " a common deep-water foraminifer," 2 and we have several 

 specimens from our own Indian Ocean soundings at a depth greater 

 than that recorded by Brady, namely, 2,550 fathoms. 



3. Bulimina presli does not appear to be recorded by the 

 " Challenger " Report from Culebra Island, but two forms usually 

 looked upon as varieties of B. presli, namely, B. buchiana and 

 B. aculeata, are recorded from that station.3 The first-named, 

 according to Brady, "affects tolerably deep water" and has a range 

 down to 2,375 fathoms ; 4 while B. aculeata is commonly found in deep 

 water and has been recorded from a depth of 2,740 fathoms. 5 



4. Haplophragmium latidorsatum, as we have already mentioned, is 

 a very common deep-water form, and has been found at a depth of 

 3,950 fathoms. 



5. Ammodiscus incevtus, as Mr. Hume admits, is " a marked feature 

 in all modern deep-sea soundings." 6 We may add that its geological 

 range extends to the Carboniferous strata, and it has been recorded 

 from nearly all subsequent formations. 



6. Tritaxia tricarinata can, we fear, afford evidence of very little 

 value. It is extremely rare in recent seas. It was found by the 

 *' Challenger " at Raine Island only, and it is not recorded in Egger's 

 " Gazelle " Memoir. 7 On the other hand, it was extremely abundant 

 in Cretaceous times, and records of its occurrence in later formations 

 appear to be wanting. 



7. Spiroplecta annectens is recorded by the " Challenger " Report s 

 from depths of 140 and 155 fathoms, both in the neighbourhood of 

 Torres Straits. At the time the " Challenger " Report was written 

 it had not been found elsewhere in recent seas ; but we have lately 

 ■obtained characteristic and well-developed specimens from the 

 Arafura Sea at depths of 1,926 and 2,413 fathoms. 9 



8. Gaudryina rugosa is found in comparatively shallow water at the 

 present day (11 to 675 fathoms), but it is met with at localities very 

 different in character from Torres Straits. 10 



1 " Foraminifera of the Crag. Part II.," p. 152. Mon. Pal. Soc. ; 1895. 



2 Rep. Chall. Zool., ix., p. 378 ; 1884. "Tom. cit., p. 759. 

 4 Tom. cit., p. 407. 5 Tom. cit., p. 406. 

 6 Nat. Sci., vii., p. 274 ; Oct., 1895. 



7 Abhandl. k. layer. Akad. Wiss., II. Classe, xviii. (ii.), pp. 195-458 ; 1893. 



*Rep. Chall. Zool., vol. ix., p. 376 ; 1884. 



°The exact localities are (a) lat. 7° 23' 8" S. ; long. 128 48' 18" E. 

 (b) lat. 4 28' 56" S. ; long. 128 2' 12" E 



10 Rep. Chall. Zool., ix., p. 381 ; 1884. 



