Manchester Memoirs, Vol. Ixii. (19 17) 41 



The lateral compression of the specimen figured on Plate 

 VI. is accidental, the normal transverse section being round. 

 Rare in Gatherings 8 and 9, 1893. 



(This is B. conica H-A. & E. The specimens are almost 

 identical with the Selsey types, but somewhat smaller than the 

 better developed Australian specimens.) 



[68. Bigenerina SELSEYENSis, Heron- Allen & Earland.] 

 \_Bigenerina selseyensis, Heron-Allen & Earland, 1908, etc., 

 S.B. 1909, p. 330, pi. XV, figs. 15-17-] 



68a. Siphogenerina hexagona, sp. nov. 

 PL VI, fig. 5. 



Test elongate, slightly compressed, early portion biserial, 

 followed by a linear series of sub-globular chambers, aboral 

 extremity of test generally furnished with a stout spine, surface 

 decoration consisting of a raised hexagonal network. Aperture 

 oval, large, with a raised rim. Length, .33mm. 



This new form bears a strong resemblance to 5". schlum- 

 bergerii, Millett, differing chiefly from that species in its surface 

 ornamentation. I have observed the internal tube which is a 

 feature of Siphogenerina in a specimen mounted in a trans- 

 parent medium. 



The species is rare and apparently only occurs in the lower 

 portion of the Cote des Basques Marls. 



(These are typical B. selseyensis H-A. & E.) 



[69. Bigenerina selseyensis, Heron-Allen & Earland.] 

 69A. Siphogenerina calcarata, (Berthelin.) 



Bigenerina calcarata, Berthelin, 1880, Mem. Soc. Geol., France, 

 (3), vol. I, No. 5, p. 27, pi. I, figs. 14-16; and pi. II, 

 figs. 2, a, b. 



Sagrina calcarata, Chapman, 1898, Journ. Roy. Micr. Soc, p. 

 15, pi. II, fig. 14. 



Rare and local, about a dozen specimens having been 

 found in gatherings No. 8, 1893, whilst it is altogether absent 

 from other gatherings. Millett in his " Foraminifera of 

 the Malay Archipelago" (*) remarks that the aperture of 

 S. schlumbergerii closely resembles that of B. calcarata; this is 



* Journ. Roy. Micr. Soc, 1900, p. 7. 



