28 HALKYARD, Fossil Foraminifera of the Blue Marl 



Genus Ammodiscus, Reuss. 



49. Ammodiscus milioloides, (Jones, Parker & Kirkby). 



PI. I, fig. 10. 



Trochammina milioloides, Jones, Parker & Kirby, 1869, Ann. 



Mag. Nat. Hist., ser. 4, vol. IV, p. 390, pi. XIII, figs. 9-14. 



T. milioloides, Brady, 1876, Carboniferous and Permian 



Foraminifera, Palseontograph. Soc, vol. XXX, p. 79, 



pi. Ill, figs. 11-15. 



The specimens figured by Brady in the work above noted 

 are not so much compressed as those found in the Blue Marl. 

 In other respects the examples from both localities agree fairly 

 well. The test is formed of fine material and is of dull whitish 

 colour. Only three specimens, one imperfect, have been found 

 at Biarritz, and a drawing is here given of the most typical one. 



(The specimens have much more numerous and narrower 

 chambers than in the typical Trochammina milioloides as 

 figured in the references given by Halkyard, and in our opinion 

 would be more properly referred to Ammodiscus pusillus 

 (Geinitz), but the line of demarcation between these two forms 

 is so slight that we think the later name milioloides is entirely 

 superfluous. Geinitz's species should include all the allied 



forms.) 



Columella, gen. nov. 

 50. [Carpenteria proteiformis, Goes. I 



Carpenteria balaniformis, var. proteiformis, Goes, 1882, Retic. 



Rhizop. Caribb. Sea, p. 94, pi. VI. figs. 208-214, pi. VII, 



figs. 215-219. 

 Carpenteria proteiformis, Brady, 1884, Chall. Rep., p. 679, 



pi. XCVII, figs. 8-14.] 



50A. Columella carpenteri^eformis, sp. nov. 

 PI. II, figs. 1-5. 



Test adherent by a spreading base, columnar, irregularly 

 spiral and conical, in the young adherent portion, as successive 

 chambers are added on the mode of growth gradually chang- 

 ing from a spiral to an approximately linear and erect series. 

 Shell-wall thin and finely-arenaceous. Aperture, terminal, in 

 a short mammiliform process, set excentrically with regard to 

 the longitudinal axis of the last chamber. Height of erect 

 specimens, .95 to 1.45 mm. 



