REPORT OF THE DIRECTOR I918 I 57 



Textularia gramen d'Orbigny 



Plate I, figures S, 6 



Textularia gramen d'Orbigny, 1846, Foram. Foss. Vienne, p. 248, 

 pi. XV, figs. 4-6 



Textularia gramen d'Orbigny is typically a short, thick, few- 

 chambered form closely related to T. hauerii and T. a b b r e - 

 V i a t a. On slide 4 we find what appears to be a narrow form of 

 this species but it is probably cut a little diagonally as one side is 

 not very distinct. A better illustration but not complete, is found on 

 slide 5 (X). 



The segments of this form are less globose than in T. g 1 o b u- 

 1 o s a ; and it is more coarsely constructed. It is best known as a 

 Tertiary fossil. In the Bonaventure cherts this specieB is rare, the 

 most abundant form being T. globulosa Ehrenberg. The 

 specimen represented on slide 4 measures 0.14 mm in length and the 

 more typical specimen on slide 5 (X), but 0.08 mm. 



Textularia pupa Reuss 



' Plate r, figures 7, 8a, b 



Textularia pupa Reuss i860, Sitz. Akad. Wiss. Wien, p. 232, pi. 13, 

 figs. 4, 5. (Textilaria) 



On slide 3 occurs a cross section of a very minute textularian 

 resembling T. globulosa in outline but with its segments less 

 arched and the ultimate chamber a little angular. The septa are 

 narrow, curving less than in globulosa, and the form corresponds 

 to Textularia pupa Reuss from the Cretaceous of Westphalia. 



This species must be considered very closely related to the more 

 abundant form T. globulosa but can be distinguished from 

 this by its septa, greater proportional width and mere flattened 

 segments. The form on slide 3 consists of but four and three chambers 

 in each series and measures but o.io mm in length and belongs to the 

 hyaline, delicate-walled textularian type which seems greatly to 

 predominate in these cherts. In fact, we doubt whether any other 

 Textulariae, save the T. gibbosa, of these cherts were originally 

 built of anything but pure calcareous matter, suggesting rather 

 deep oceans free from shore sediments. A less typical specimen is 

 found on slide 5. 



