226 Bibliographical Notice. 



Ehrenberg finds that the notion of there being partially, or even 

 altogether, different life-conditions in the superficial and the deep 

 sea is weakened by his numerous observations. 



Polycystina, Actinophrys, Coccoliths, and Bathyhius, besides the 

 relationships of animals, and development, as treated by Darwin and 

 others, are subjects also dwelt upon, in a conservative manner, in 

 the memoir of which the abstract is before us ; and the author re- 

 co nmends cautious limitation of subject, restriction of hypothesis, 

 and uniformity of method, as the only foundation for good worl? 

 among naturalists. 



The diagnoses of a great number of living genera and species of 

 Polythalamia, Polygastrica, Polycystina, Spongolithides, Geolithia, 

 and Zoolitharia follow (pp. 276-322). 



A review of Prof. Ehrenberg's genera and species of Forami- 

 nifera having been lately off'ered in the ' Annals of Nat. Hist.' 

 (Nos. 51, 52, 57, 58, and 60, vols. ix. k x. 1872), it is convenient 

 to add in this place some results from a study of the new notices 

 before us. 



To the Polj'thalamia [Foraminifera] Prof. Ehrenberg adds, as 

 genera :• — ^1. Aspidodexia (apparently some Rotaline). 2. Bolbod'mm 

 (possibly a Pidlenla). 3 and 4. Hemisterea and Hemistkta (probably 

 IlofaJitue, of which there are several genera which have the spiral 

 or upper surface porose, whilst the umbilical or lower face has an 

 extra-thick glassy coat). 5. Otostomnm (probably a dimorphous 

 Virr/idina, such as is indicated under the name Bifarina in Ann. 

 Nat. Hist. Sept. 1872, p. 198). Lastly, No. 6. Pylodexia [1859], 

 which is intended to comprise the Ghhiyerlnce which have the spire 

 on the left and the large aperture on the right side, the true Glo- 

 biyennce having these features reversed — characters which appear to 

 be of little or no value. 



Of Foraminifera 90 are described as new species, chiefly from great 

 depths in the Arctic and Atlantic oceans, with several from the 

 Agulhas Eank (at about 400 feet depth) off the Cape of Good Hope, 

 and a few from the Pacific. Of " Polygastrica," 39 are diagnosed; 

 of Polycystina, 123 ; Spongolithides &c., 7. 



Ehrenberg's Microzoa &c., we must refer to the several lists of local spe- 

 cies of Foraminifera, determined according to the revised nomenclature, 

 in the review of his figured fossil specimens in the ' Annals of Nat. Hist.' 

 Nos. 51, 52, 57, 58, and GO, vols. ix. and x. 1872 ; and we must add that 

 in the classified list of fossil Foraminifera figured by Ehrenberg down to 

 1858, in the 'Annals of Nat. Hist.' Dec. 1872, pp". 454-457, there are 

 enumerated, besides 20 undetermined foniis, only 138 species and notice- 

 able varieties, most of which are living at the present day, and of which 

 81 had been named by other observers. 



I 



