REPORT OR THE FORAMINIFERA. 
595 
Globigerina bulloides is a cosmopolitan species. It occurs in surface-gatherings 
wherever Foraminifera have been collected, and in bottom-dredgings at almost every 
latitude. 
The earliest appearance of the species is in the Cretaceous period, and it has been 
found in the marine deposits of each succeeding stage of the geological series. 
Globigerina bulloides, var. triloba, Reuss (PI. LXXIX. figs. 1, 2 ; PI. LXXXI. 
figs. 2, 3). 
Globigerina triloba, Reuss, 1849, Denkschr. d. k. Akad. Wiss. Wien, vol. i. p. 374, pi. xlvii. 
fig. 11, a-e. 
Pylodexia atlantica, Etirenberg, 1873, Abhandl. d. k. Akad. Wiss. Berlin (1872), p. 388, pi. iv. 
fig. 2. 
General characters similar to those of Globigerina bulloides, but with the final 
convolution consisting of three relatively very large segments which sometimes form 
the entire visible shell. 
This is a comparatively unimportant subvarietal form, but it is one which has been 
generally recognised by Continental palaeontologists. 
In distribution it is always associated with the typical Globigerina bulloides. 
Globigerina dubia, Egger (PI. LXXIX. fig. 17, a.b.c.). 
Globigerina dubia, Egger, 1857, Neues Jalirb. fur Min., &c., p. 281, pi. ix. figs. 7-9. 
„ conglomerata (?), Schwager, 1866, Novara-Exped., geol. Theil, vol. ii. p. 255, 
pi. vii. fig. 113. 
„ dubia, Brady, 1879, Quart. Journ. Micr. Sci., vol. xix., N. S., p. 71. 
Test rotaliform, subglobular, somewhat compressed ; margin rounded and lobulated ; 
inferior umbilicus large and deeply sunk ; composed of about three convolutions, the 
outermost of which consists of five or six relatively small, inflated segments ; the 
apertures of the chambers opening directly into the umbilical vestibule. Diameter 
often nearly ^th inch (0‘73 mm.). 
The Globigerina dubia of Egger can only be accepted as a varietal modification of 
Globigerina bulloides, representing perhaps the best development of the typical characters. 
The test attains somewhat large dimensions, it is stout and compactly built, distinctly 
Rotalian in general conformation, and with a well-marked umbilical cavity. It has fre- 
quently as many as fourteen or fifteen segments. 
Pelagic specimens of this variety have been taken in the South Atlantic and in the 
North and South Pacific ; and in bottom-ooze it has been found also in the North 
Atlantic. Its northern limit appears to be about lat. 56° N., a little to the south of 
