REPORT OF THE DIRECTOR I918 1 55 



DESCRIPTION OF SPECIES 

 Genus, TEXTULARIA Def ranee 



The genus Textularia, in early writings often spelled Textilaria, 

 is remarkably well represented in the Bonaventure cherts by at least 

 five species. Textularia globulosa Ehr. predominates 

 and on slide 5 constitutes the most frequent type of any Foraminifera 

 present. With the exception of Textularia trochus d'Orb., 

 all species of this genus are extremely minute and indicate the 

 delicate calcareous and hyaline varieties suggesting rather deep- 

 water conditions. Between these tiny T. globulosa and T. 

 trochus lies an intermediate sized form T. g r a m e n d'Orb., 

 but this is narrower and less coarsely constructed than most speci- 

 mens belonging to this species. 



Textularia is one of the earliest types of Fpraminifera to develop 

 and has been recognized in every geologic period from the lowest 

 Cambrian to the present. Professor Brady in his monograph on 

 The Carboniferous and Permian Foraminifera describes five species 

 of Textularia from those formations. We are not aware, however, 

 of so many perfect types ever having been identified in Lower Paleo- 

 zoic strata such as we are studying; but our investigations only prove 

 what we have long suspected, that given favorable conditions for 

 silicification these primitive organisms will be found represented by 

 many genera in Cambro-Silurian eras. 



Textularia gibbosa d'Orbigny 



Plate I, figures i, 2a, b 



Textularia gibbosa d'Orbigny, 1826, Ann. Sci. Nat., 7: 262, no. 61 

 Textularia g i b b o s a Brady, 1876, Pal. Soc, vol. for 1876, p. 131, 



pi. X, fig. 36 

 Textularia g i b b o s a Jones, Pal. Soc, vol. for 1895, p. 152, pi. Ill, 



figs. 10-13, and pi. V, figs. 13, 14 



The comparatively large, coarsely constructed Textularia seen on 

 slide I belongs to a very different type of Textularia than the more 

 common, delicate, globular chambered forms seen in all of these 

 cherts. The cross section of one or two other few-chambered, 

 rapidly enlarging, stout forms would give almost the same appear- 

 ance when seen in thin section. This would also be true of the 

 ultimate chambers of Gaudryina; but, because the distal segments 

 are lacking in our specimen, whether it is irregular in these primordial 

 chambers or not can not be determined, and we believe the form is a 



