8 DISCOVERY REPORTS 



Cyclammina elegans, stand out, according to the literature, as a definite indication of an 

 uppermost Cretaceous age. In the case of Rzehakina and Pseiidotextularia (or Gum- 

 belina, which name I take as a synonym) the genus alone would appear adequate for this 

 age determination. Nodosaria limbata and Gyroidina nitida are also typically Upper 

 Cretaceous species, but it is not quite clear that they are confined to strata of this age. 



Pseiidotexttdaria globulosa (Ehrenberg) was described from the Upper Cretaceous of 

 various countries.^ It has been recorded from Tertiary, Quaternary and even present 

 day material, but in such cases I believe that it has generally occurred as a derived 

 Cretaceous fossil, a point which has frequently not been made clear. It is often very 

 abundant in Upper Cretaceous strata, and Cushman has frequently stated that in 

 the American occurrences so far known it has not been found above the top of the 

 Cretaceous.^ 



Spiroplectammina spectabilis (Grzybowski) was described from the Upper Cretaceous 

 of Krosna, Poland, under the generic name Spiroplecta.^ It has page priority over the 

 megalospheric form,* described separately under the name Spiroplecta brevis, Grzy- 

 bowski,^ which is thus a synonym. Later, a rather broader microspheric form of 

 what appears to be the same species was described under the name Spiroplecta 

 clotho, Grzybowski,^ also from the Upper Cretaceous of Poland. I am indebted 

 to Mr Earland, who had a translation made from the Polish text, for the information 

 that Grzybowski states that all three of the above species are "siliceous with a smooth 

 surface". 



The Burdwood Bank specimens are entirely siliceous ; the wall of the test is fairly 

 smooth, but is clearly composed of fine sand grains set in a large excess of cement. 



Galloway and Morrey describe and figure a form under the name Spiroplectammina 

 rosula (Ehrenberg) from the Upper Cretaceous of Mexico," which seems to be the same 

 as the megalospheric form of the Burdwood Bank species. They state that " The wall is 

 now entirely siliceous, the surface is rough and granular, and there is little doubt that 

 the wall was originally arenaceous". 



The species does not appear to be recorded from other than Upper Cretaceous 

 strata. 



Cushman and others have described and figured forms from the Upper Cretaceous 

 of Mexico and Trinidad under the name Spiroplectoides clotho (Grzybowski), which 



1 1838, Abh. k. Ak. Wiss. Berlin, p. 135, pi. iv, lig. ^, frequens. 



^ E.g. J. A. Cushman, 1926, Contrib. Cushman Lab. Foram. Research, 11, p. 16; 193 1, op. cit., vii, p. 39; 

 1927, Amer.J. ScL, xiii, p. 324. Since writing the above, a new species, Giimbelina wilcoxensis, has been 

 described by Cushman and Ponton from the Wilcox formation, or upper part of the Lower Eocene, of 

 Alabama, U.S.A. (1932, Contrib. Cushman Lab. Foram. Research, viii, p. 66, pi. viii, figs. 16, 17). 



^ 1898, Rospr. Ak. Lhniej. [Mal.-Przyrod.) Krakow, ser. 2, xiii, p. 293, pi. xii, fig. 12. 



^ There seems a possibility that trimorphism may be shown by this species, in which case the Aj form 

 may be Grzybowski 's S. brevis; Aj, S. spectabilis; and B, S. clotho. 



= Loc. cit., p. 293, pi. xii, fig. 13. 



^ 1901, Rozpr. Ak. Umiej. (Mat.-Przyrod.) Krakozv, ser. 3, I, dz. B, p. 283, pi. vii, fig. 18. 



' 1931, jfourn. Pal., v, p. 335, pi. xxxvii, fig. 10. 



