348 



Fig. 2, Fahdaria Ho'vchiiii, Schlumberger. Form B, x 50 diam.* 



The fig. 2 gives the reproduction of the complete medial 

 section of a specimen of the Form B whose central chambers 

 were partly destroyed. It will be seen that the successive 

 chambers, increasing by external growth, are more and more 

 divided into longitudinal canals by large ribs, whose calcareous 

 deposit is extended over the outward face of the preceding 

 chambers, so that each chamber becomes a complete investment, 

 as in all the Miliolidw trematophovft'. 



Fig. .3. Fig. 4. 



Fabularia Hourhini, Schlumberger. x 20 diam. Successive appear- 

 ances of the preceding specimen, fig. 2. 



The figs. 3 and 4 give the appearance of successive sections of 

 the same specimen (fig. 2) taken, the former at the beginning of 

 the operation, the latter at the quarter of the length. They 

 show that the apertures of the chambers (xiv., fig. 3, and xiil., 



* During the preparation of this section the last chamber (xv.) was lost. 



