347 



covered. It is probable that the disposition of the central 

 chambers, which is characteristic of the latter form, will be 

 found in the case of very small individuals, as occurs with the 

 minute examples of Fahularia discolithes. 



FAMILY MILIOLID.*:. 

 Genus — -Fabularia, Defrcmce. 



Fabularia Howehini, Schlumberger. 



Form A. — Unknown. 



Form B. — In a median transverse and transparent section of 

 Fabularia Hoivchini of Form B we find in the middle an oval 

 microsphsera surrounded by four little chambers (Hg. 1). 



Fig. 1. Fahularia Howehini, Schlumberger. Form B, central portion 

 X 100 diam. 



The chambers iv. to vii. constitute successive triloculine 

 cycles, and the last (vii.) is the first biloculine chamber. All 

 the next are disposed alternately on the two sides of the axis of 

 the poles in the same plane of symmetry as in the Biloculimp. 

 The first seven chambers have thin walls, leaning only against 

 the preceding. The wall of the chamber viii. becomes larger and 

 produces an internal rib, extending to the wall of the chamber 

 VI., and thus dividing chamber viii. into two longitudinal canals. 

 The next cliamber (ix.) is divided into three canals by two 

 internal ribs, and we remark in the greatest of them the begin- 

 ing of a third rib from the inner side. 



