BihJiographical Notice. 369 



In the descriptions, as in the illustrations, economy of space has 

 been very closely studied. All details of nomenclature that could 

 at all be spared have been omitted, and only clues, as it were, are 

 given to synonymy and the oricin of names, H. B. Brady's ' Chal- 

 lenger ' Report, 1SS4, is referred to throughout, with all the syjccies 

 except those that are new and some few others ; the i)onier\clature 

 being given very curtly and left to be worked out from the ' Chal- 

 lenger ' Kcport, for by far the most part, and from the works of 

 d'Orbigny, Reuss, Giirabel, Schwager, Silvestri, Moebius, Schhim- 

 berger, and a few other authors of species or genera occurring here 

 and there in the ^Memoir, with bare reference only to monograph or 

 memoir. Rhizopodists, however, have to be thankful to the Bavarian 

 Academy for having printed and published this important mono- 

 graph, though limiting tlie Author to so imperfect a method of 

 nomenclature. 



Dr. Egger especially acknowledges the kind help and counsel he 

 has received from Dr. C. W. von Giimbel, of Munich, in the further- 

 ance of his work *. 



The distribution of Foraminifera, as indicated by the results of 

 Dr. H. B. Brady's study of those brought home by the ' Challenger,' 

 is throughout referred to in addition to Dr. Egger's determination 

 of those obtained by the ' Gazelle : ' and the long Table of the 

 distribution of the species at pp. 249-261 (441-453), and particu- 

 larly the notes on the eight zones of depth, at pp. 262-205 (454- 

 457), supply important additions to our knowledge of the hydro- 

 graphical and bathymetrical range of the Foraminifera. The long 

 Table referred to gives the relative abundance or scarcity of the 

 several species at a glance, owing to the relative abundance or 

 sparseness of the figures in the columns carrying the numbers of the 

 Stations. The eight zones, each taking 100 metres of depth, 

 reaching to 6000 metres, with the several stations where they were 

 met with successively enumerated, give the proportionate occur- 

 rence of individual Diatoms, Radiolarians, Ostracods, and Foramini- 

 fera for the Stations, and the numerical value of the species of the 

 last for the zones of depth. Thus in the fifth zone (from 2000 to 

 2999 metres) there were 10 species of GJobir/erina, 11 Pidvinidina, 

 9 TnmcatuUna, 6 Lar/ena, 5 Bulivi na, 4 Disco rbina, and some others. 

 In the 6th zone (3000 to 3999 metres), with a very great abun- 

 dance of individuals, the number of species was relatively small — 

 18 Globif/erina, 13 Lcu/ena, 11 Pidvimdina, 9 Tnincatidina, 5 Milio- 

 lina, 4 BUoculhia, with Discorhina, Virgidina, Bolivina, &c. In 

 the 7th zone (4000 to 4999 metres) there were only 11 species of 

 Ohhigerina, 9 Pidvimdina, 3 Rotalina (Eotalia), with Lcif/ena and 

 Virgidina. In the deepest (8th) zone (from 5000 to 6000 metres) 

 the species were represented by 16 of Glohigenna and 9 oi Pidvinu- 

 lina. 



* The mineral and geological conditions of the Ocean-bed, as shown 

 by the Soundings obtained by the 'Gazelle,' are fully treated of by 

 Dr. von Giimbel, &c., &c., in the Second Part (Physics and Chemistry, 

 1888) of the " Forschungsreise S.M.S. ' Gazelle.' " 5 vols., 4to, Berlin, 

 1888-90. 



