254 THE CANADIAN NATURALIST. [Vol. viL 



diagonal interrupted ridges or wrinkles, which may also be seea 

 in specimens from the English chalk. This form is doubtless 

 identical with T. globulosa* of Ehrenberg, noted as being ia 

 cretaceous material from Dakota and Nebraska, and falls under 

 D'Orbigny's species 7'. gibbom.f T. glohnlosa was found by 

 Ehrenberg in the Brighton and Gravesend chalk, and ia one of 

 the commonest forms in the latter. It also occurrs in the Meu- 

 don chalk of France, ana is still living in the Mediterranean and 

 elsewhere, in depths of from 50 to lUO lathonis.| 



The second Textularine form is usually 'Mnnller and more 

 delicate than the last. It is longer in proportion, consiaerubly 

 flattened, and with more elongated chambers. It is compara- 

 tively rare. Not unfrequently the first two or three chambers 

 nre very small, and arranged almost in a linear series. This 

 may be equivalent to T. Missoimensis, or one of the other forms 

 recognized by Ehrenberg, but according to the revised nomen- 

 clature may bo included under T. cnjglittinans, variety ^>^<f?na'</, 

 D'Orbigny. This form is closely allied to if not identical with 

 one found in the English chalk, and is common at the present 

 day in the North Atlantic and elsewhere, becoming, however, 

 rare and small at great depths, and appears to be most at home 

 in about 90 fathoms in the latitude of England.^ 



Both of these Textulariae are small and frequently defornjed, 

 and there are forms more or less intermediate between the types 

 here described. Both typijs appear prominently in the material 

 I have studied from the Upper Missouri, || and Ehreuberg's addi- 

 tional varieties, if his specimens were such as I have seen, were 

 probably based on transitional or more or less abundant forms 

 which might be included with advantage under these types^ 

 Both forms have a weak and depauperated appearance. 



* Hmithsouian chock list of C.ctaceous Fossils. 



t See Parker and Jones, Geol. Mag. Vol. viii. No. ] 1. 



i The same species or a variety of it seems to be named T. Americana 

 by Bailey, in Silliman's Juurnal, vol. 46. In any case, a comparison 

 of specimens shows that the common species at Pembina Mountain is 

 even varietally identical with one common in the English chalk. 



g Parker and Jones on North Atlantic and Arctic Foraminifera. 



II Specimens presented by the Smithsonian Institution to the Mu- 

 seum of McGill College, from '< Eau qni Court,"' on the Niobrara 

 River, about 500 miles South of Pembina Mountain, are rery similar 

 to those from the latter place, containing the same Foraminifera and 

 abundant Coccoliths and Khabdoliths, with Ostrea congesta. 



