410" PROF. ALLMAN ON THE RECENT RESEARCHES 



pseudopodia, or are aggregated in heaps. The chains of cells 

 remind us strongly of the Lahyrintliulea. They move about, 

 creep over the surfaces, and finally unite into the little yellow glo- 

 bules in which they were first noticed. 



Cienkowski places this curious little organism in the genus 

 Diplophrys ; though, from its minuteness, it is not easy to say 

 whether it is naked or furnished with a shell. He assigns to it 

 the specific name of stercorea. 



The only form of multiplication obserA'^ed in it is by fission, as 

 in Diplophrys Archeri. During the fission the yellow pigment- 

 globule in its interior participates in the division. 



Another amphistomatous freshwater rbizopod nearly allied to 

 Diplophrys, from which it differs mainly in its elliptical test 

 being strengthened by the incorporation of foreign particles, is 

 Archer's genus AmpMtrema*. At each end of the longer diameter 

 of the test is a round orifice through which is emitted a dense tuft 

 of branching pseudopodia. 



Among the most important results derived from recent study 

 of the Ehizopoda is the discovery of a nucleus in the so-called 

 Foraminifera. The failure of all previous attempts to demon- 

 strate the presence of a nucleus in the calcareous -shelled marine 

 Ehizopoda, whether monothalamian or polythalamian, led to the 

 belief that they possessed the morphological value of a cytode or 

 non-nucleated protoplasm mass, and they were accordingly rele- 

 gated to the lowest stage in the systematic arrangement of the 

 Ehizopoda. 



This view must now be abandoned ; for the independent and 

 nearly simultaneous researcbes of Hertwigf and of Franz Eilhard 

 Schulze ;|: have demonstrated the presence of a nucleus in repre- 

 sentatives of all the principal divisions of the Foraminifera, and 

 justify us in the general conclusion that their protoplasm is in 

 every case nucleated. 



By the aid of dilute chromic acid and subsequent tinging 

 with carmine, Hertwig succeeded in demonstrating a nucleus in 

 young specimens otMiliola, which as yet consisted of but a single 

 chamber, as well as in older ones where additional chambers had 

 been formed. In the latter case the number of the nuclei was 



■* Archer, loc. cit. 



t Jenaische Zeit.sch. vol. x. (1876). 



I Arch. f. mikr. Anat. toI. xiii. (1876). 



