40 Halkyard, Fossil Foraminifera of the Blue Marl 



66. SlPHOGENERINA SULCATA Sp. nOV. 



PI. VI, fig. 3. 



Test elongate, biserial ( ?) at first, afterwards uniserial,, 

 acuminate at the commencement, circular in transverse section 

 increasing in diameter to the final segment. Segments short and 

 broad, ornamented with short thin costae which are not con- 

 tinuous but are interrupted at the transverse sutures. Aperture 

 a depressed slit, sometimes supplemented by scattered pores bn 

 the septal face. Length, .62mm. 



Rare, only found in two gatherings, which, however, are- 

 separated by a considerable thickness of the Marl. Owing to 

 lack of specimens and mal-conservation I have unfortunately 

 been unable to verify beyond doubt whether the earlier portion 

 of the shell is invariably biserial, but in the specimen of which a 

 drawing is given this plan of growth seems to be followed, 

 and is undoubtedly so in another specimen which was carefully 

 broken up with a view of ascertaining' the internal structure- 

 of the test. The results of this examination showed that the 

 test commenced on the textularian plan, with five or six alter- 

 nating chambers, followed by a linear series of five segments 

 which were provided with internal median tubes. The number 

 of chambers in the biserial portion of the test may be variable, 

 and necessarily are so in the uniserial portion. 



(This is closely allied if not identical with Bigenerina conica 

 H-A. and E. (H-A. and E. 1908, etc., S.B. 1909, p. 329, pi. 

 XVI), differing only in the absence of the external tubulL 

 Identical specimens occur frequently in the Australian Miocene 

 of Filter Quarry, where they pass gradually into B . conica.) 



[67. Bigenerina conica, Heron- Allen & Earland.] 



{Bigenerina conica, Heron-Allen & Earland, 1908, etc., S.B. 

 1909, p. 329, pi. XVI.] 



67A. SlPHOGENERINA PAPILLOSA, sp. nOV. 



PI. VI, fig. 4. 



Test elongate, transverse section circular, increasing in 

 diameter to the final segment, early portion biserial (?), after- 

 wards uniserial. Segments short and broad, each one orna- 

 mented with one or two rows of papillae. Aperture a curved 

 slit. Length, .62mm. 



The general characteristics of this species are similar to 

 those of 6\ sulcata. It varies from the latter only in surface 

 decoration, and perhaps in the absence of the supplemental 

 orifices which occasionally appear in ^S". sulcata. 



