NOTES AND MEMORANDA. 99 



answered still better. A nucleolus did not appear to exist, 

 but rather the nucleus seemed to form a homogeneous mass ; 

 but its unequal coagulation might present a nucleolus-like 

 aspect. There was only one nucleus, and that in the primary 

 chamber. 



We have manifestly here the starting-point of the repro- 

 ductive process observed by Max Schultze and others. It 

 consists essentially in this, that within the mother-shell, in a 

 manner not yet more closely observed, daughter individuals 

 are developed, surrounded by a proper shell. In Miliola and 

 Nonionina the daughter individuals are one-chambered, in 

 Rotalia — from the commencement — three-chambered. It is 

 of interest to note that in both cases the young individuals 

 are single-nucleated — are unicellular — regarding the nucleus 

 as the centre of individuality of the cell. 



From his experience, so remarkably confirmed by that of 

 Professor Eilh. Schulze, then, the author feels justified in 

 drawing the conclusion that all the Foraminifera — Imperfo- 

 rata and Perforata— are nucleated, thus removing the only 

 ground of systematic separation of the Foraminifera from the 

 Monothalamia, and both groups must be united in a single 

 Class. The freshwater Monothalamia would, of course, most 

 approach the single-chambered Gromia, Cornuspirse, &c. 



For such a Class the author urges the names " Poly- 

 thalamia" and " Foraminifera," being applicable to only a 

 part of the series, not to the whole, are manifestly each 

 respectively unsuitable. 



'INlore appropriate would be Haeckel's term " Acytaria ;" 

 Haeckel, however, so designates the Foraminifera only, to 

 the exclusion of the freshwater Monothalamia, which latter 

 he includes under his Lepamoebse. As regards its significa- 

 tion, the term might certainly be extended to embrace 

 the Monothalamia ; but Haeckel employed the name to dis- 

 tinguish Radiolaria without a central capsule from those 

 furnished therewith. Now, there are whole series of sarcode 

 organisms agreeing in this respect with Foraminifera which, so 

 far as that is concerned, might be relegated to the Acytaria. 

 The designation is, therefore, defective. For this reason the 

 author proposes to call the class " Thalamophora," in allusion 

 to their all-pervading characteristic. 



As regards the subdivision of the Thalamophora, the 

 author points out that two courses are open : either we might 

 make the arrangement of the chambers ihe principle of divi- 

 sion, or the finer structure of the chambers ; in tlio one case 

 we should subdivide them into Mono - and Polythalamia, after 

 Max Schultze; or, in the other case, into Imperforata or 



