30 HALKYARD, Fossil Foraminif era of the Blue Marl 



This opinion is strengthened by the evidence afforded by 

 a thin transparent section which we have prepared from one of 

 Halkyard's specimens, which in addition to the double shell wall 

 reveals the fact that the walls of successive chambers are 

 distinct, and sometimes separated by a distinct canal structure 

 as in Carpenteria. The paucity of material has prevented us 

 from confirming our observations by means of further sections. 



The question whether Halkyard's specimens are identical 

 with the curious form described by Liebus from Biarritz under 

 the name Karreria lithothamnica (Uhlig) and similar forms 

 described by Uhlig, Rzehak and Hantken from Central Euro- 

 pean Tertiary deposits under various names, Karreria (Carpen- 

 teria) lithothamnica, Rupertia stabilis, Rupertia incrassata, 

 Nubeciilaria elongata ( = budensis) must remain open, pending" 

 a comparison of the specimens with the types of those authors. 

 Both descriptions and figures suggest that they are all mere 

 variations of Goes' type Carpenteria proteiformis. 



For the literature of these somewhat complicated questions 

 of diagnosis see (i) V. Uhlig. Ueber eine Mikrofauna aus dem 

 Alttertiar der westgalizischen Karpathen. Jahrb. der k.k. geol. 

 Reichsanst, 1886, Vol. I. pt. 1, pp. 184-189. (ii.) A. Rzehak. 

 Die Foraminiferenfauna der alttertiaren Ablagerungen von 

 Brudendorf in Niederoesterreich. Ann. des k.k. nat. Hofmus- 

 eums, 1891, Vol. VI. pt. 1, p. 6. (Hi.) A. Rzehak. Ueber einige 

 merkwurdige Foraminiferen aus dem cesterreichischen Tertiar. 

 Ibid. 1895, Vol. X. pt. 2, p. 226. (iv) A. Liebus. Ueber die 

 Foraminiferenfauna der Tertiarschichten von Biarritz. Jahrb. 

 der k.k. geol. Reichsanst, 1906. Vol. II, pt. 2, p. 361.) 



FAMILY TEXTULARIDiE. 



SUB-FAMILY TEXTULARIN^. 



Genus Textularia, Defrance. 

 51. Textularia trochus, d'Orbigny. 



Textularia trochus, d'Orbigny, 1840, Mem. Soc. Geol., France, 



(1), p. 45, pi. IV, figs. 25, 26. 

 T. trochus, Brady, 1884, Chall. Rep., p. 366, pi. XLIII, figs. 



15-19 and pi. XLIV, figs. 1-3. 



Typical, and common, particularly in the upper half of the 

 beds examined. In some broken specimens which have been 

 found the porous nature of the test is most clearly shown 

 owing to its being infiltrated by pyrites which contrasts 

 strongly with the grey colour of the sandy test. 



