﻿232 Revieivs — The PalceontograpMcal Society. 



are treated of together), and the more frequent opportunities of 

 finding them afforded by the disintegrated shaly wayboards, or 

 partings, of the limestone, are also noticed. 



The " Zoological Considerations," of especial interest to the Ehizo- 

 podist, comprise a critical review of von Eeuss' and Carpenter's 

 classifications of Foraminifera, and a general comparison of the 

 generic forms known in the Carboniferous strata with those now 

 living. The conclusions arrived at are — 1st. The prevalent forms 

 (except FusuUna) in the Carboniferous and Permian limestones do 

 not belong strictly to either of the two sub-orders (Imperforata and 

 Perforata) into which Foraminifera have been divided, but to inter- 

 mediate types (especially Trochammina, Valvulina, Endothyra, Nodo- 

 sinella, and Staclieia), neither invariably arenaceous nor uniformly 

 perforate in their shell-texture. 2nd. In the modifications of these 

 primitive intermediate types there are some varieties conspicuously 

 sandy and imperforate, others essentially hyaline and porous ; and 

 these varietal peculiarities seem to have been transmitted as perma- 

 nent characters, thereby originating the two parallel isomorphic 

 series. 3rd. The porcellanous imperforate group (Miliolida) is of 

 later creation, judging from negative evidence. 4th. The Permian 

 Ehizopod-fauna is much more limited than the Carboniferous, being 

 confined to five generic types {Trochammina, Nodosinella, Nodosaria, 

 Textularia, and FusuUna), representing, however, at least four dis- 

 tinct families of Foraminifera, which in the Carboniferous rocks are 

 represented by fifteen genera. 



In the " Geological and Geographical" section, Mr. Brady gives a 

 catalogue of the localities from which, with the aid of many friends, 

 he obtained the Foraminifera described and figured in this Mono- 

 graph. The exact geological horizon is duly indicated, whenever 

 ascertained. The North of England, Midland Counties and Wales, 

 Bristol District, Scotland, Ireland, Belgium, Kussia, and North 

 America are the regions, subdivided into many districts, whence 

 have come the 142 specimens of Carboniferous rocks, which yielded 

 Foraminifera to Mr. H. B. Brady's careful, and indeed laborious, 

 examination. Very many specimens of the Magnesian Limestone of 

 England and Ireland, and the Zechstein and Kupferschiefer of 

 Germany have been thoroughly searched by our indefatigable author 

 for the Permian Foraminifers. 



The " Bibliography," pp. 51-55, comprises the titles and dates of 

 the books and memoirs referred to in the Monograph ; they reach 

 from 1826 to 1876. 



The following genera and species are described and figured. The 

 plates have been exquisitely lithographed by A. T. Hollick after Mr. 

 Brady's drawings : — 



Saccammina, Sars. 



Carteri, Brady. 

 LiTuoLA, Lamarck. 



nautiloidea , Lamarck. 

 Bennieana, iiov. 

 HaplophragiMium, Eeuss. 

 rectum (Brady). 



Climacammina, Brady. 



antiqua, Brady. 

 TuocHAMMiNA, Parker & Jones. 



incerta (d' Orbigny) . 



eentrifuga, Brady. 



anceps, nov. 



annularis, nov. 



