KONG],. SV. VKT. AKADKM1EN* IIANDL1NGAK. BAND. 19. N:O 4. 1)1 



being more or less loosely connected, whence arises the difference in the number of 

 visible apertures; not nnfrequently the shell appears as if broken through by the im- 

 mense apertures, which look like large defects in the chamber-walls. The shape of 

 the chambers varies from globiform and oval to compressed thumb-like and even beak- 

 formed. 



The surface of the shell arid the size of the pores are also liable to some va- 

 riation, but even such features seem in this species to be only of an accidental 

 character. 



The most distinct character is found in the variety called Glob, hirsuta D'OKBIGNY, 

 which has its chambers regularly coiled up in a nautiloid way, with the last ones 

 generally unattached to the preceding coil. The aperture in this variety is situated on 

 the inner (or lower) side of the last chamber. It is a mediate form between the pig- 

 my and the typical forms. Notwithstanding all such peculiar features, we do not con- 

 sider it in accordance with the usual conception of varietal distinction to mark this 

 form with a separate designation. 



The thick-walled, sometimes very coarse form with several outer apertures, by 

 D'ORB. distinguished as Glob, rubra, is one of the commonest on our bottoms and has 

 usually a reddish tint. 



Mr. H. BRADY in his valuable paper Notes on some of the Reticularian Rliizopoda 

 of the f>Q]iallm(jer Expedition* in Quart. Journ. Microscop. Science (new ser.) 75, p. "284. 

 distinguishes the following varieties of Globigerina bulloides: 



Globigerina dubia EGGER. 



cretacea D'ORB. 



>> cequilateralis D'ORB. 



digitata BRAD. 



inflata D'ORB. 



Dutertrei D'ORB. 



11 rubra D'ORB. 



confflobata BRAD. 



saccutifera BRAD. 



helicina D'ORB. 



Fig. 195: a form near to REUSS' and others' Glob, trilobato, with the chambers 

 highly developed from the first and with 1 or 2 apertures; seldom met with on the 

 coralline-gravel. 



Fig. 196: a coarse, thickshelled form with large chambers and several apertures; 

 it comes near to Glob, rubra D'ORB. and may be identical with Glob, conglobata BRAD.; 

 from the coralline-gravel. 



Figg. 197 199: with large and loosely connected chambers, large apertures, and 

 with the last chamber approaching to the thumbform. The pores are of middle size 

 sunk in the bottom of the usual hexagonal impressions (fig. 199); from the coralline- 

 gravel. 



