87 



lua}^ show tlieso Hergott forms to belong to somethiug else^ 

 but for tlie time being we cannot give them a better classification. 



(f) Endothijra Bowmani, Phillips.— A few examples of a 

 Eotaliiorm Foraminifer occur at a depth of something under 

 200 feet that seem undistinguishable f rom -E'>if/oMyr« Bowmani. 

 The UndotliyrcB have been so far only known as a Carbonifer- 

 ous type, and the particular species now referred to may be 

 considered the most characteristic of all the Carboniferous 

 Eoraminifera. Its occurrence, therefore, in another geological 

 formation, and one presumably of a much later age, is a point 

 of great interest. In size the examples obtained from Hergott 

 are smaller than the average Carboniferous sjDecimens, but they 

 show a close morphological resemblance to the Palteozoic 

 forms. The same is true of the structure of the test, which in 

 the Etidofliyi'fe generally is a very fine sub-arenaceous invest- 

 ment. From examination of the Carboniferous specimens 

 Mr. Brady concluded the test to be imperforate, and a careful 

 examination of several transparent sections taken of the Her- 

 gott specimens confirms this view, as no perforation of th& 

 test walls could be determined. All the examples taken of 

 this interesting species in the Hergott material were obtained 

 by washing down the rough casts of bivalves, already referred 

 to, and indeed the rich gathering of Foraminifera obtained at 

 this depth were all such as had been drifted with the mud into 

 the shells of these molluscs, as they were rendered empty by 

 the death of the shell-fish. Whether these shells afforded the 

 necessary protection against pressure or not I cannot say, but 

 the Foraminif era obtained from their casts were free from that 

 distortion which is so common in the rest of the section.* 



Bigenerina. — This is a dimorphous Foraminifer, being Textu- 

 larian in its earlier growth and Nodosarian m the later 

 chambers. It is one of the most characteristic and interesting 

 of the Hergott forms. The genus is present in the material 

 in two species, B. nodosaria and B. digitata. The examples 

 might rather, in most cases, be considered as interme- 

 diate to these two forms. For the most part B. nodosaria 

 approaches B. digitata in a more uniform outline, with a 



*I have since sent all my mounts of this form, together with the trans- 

 parent sections, to Mr. H. B. Brady, for his opinion regarding them, and in 

 a letter bearing date of October loth, 1885, he states :— " Had I found them 

 in beds of Carboniferous age I should certainly have assigned them, as 

 you have done, to Endothyra Boivmani, and this under most circumstances 

 should be final. Nevertheless, I cannot speak with positiveness. The sur- 

 face of the test appears to me granular and corroded rather than really 

 arenaceous. On the other hand I cannot obtain any satisfactory evidence of 

 perforation. Provisionally I should be inclined to assign them to Endothyra 

 Bowmani, with some reservation in favour of Planorhidina {Anomalina) 

 ammonohle.s, or one of the allied Secondary forms." 



