36 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Radiolaria, Heliozoa, Amoebae, Infusorians, Gregarines, etc. On this 

 concrete basis he erects an elaborate theory. The hyaloplasm consists 

 of " Tagmas " and a homogeneous fluid intertagmal substance of lipoid 

 character, in which considerable quantities of water can be taken up. 

 This lipoid is the " Arbeitsubstanz " which has to do with movement. 

 Various theories of plasmic movements are discussed — the surface tension 

 theory and the coagulation theory especially. But they are rejected as 

 inadequate. There is a specific living subscance with specifically vital 

 behaviour, and the tagmas are alive, with a directive role in relation to 

 the physical and chemical metabolism which goes on around them. We 

 regret that we cannot at present do more than notice this emphatically 

 vitalistic theory of protoplasm and its movements. 



Observations on Arcella Vulgaris.*— E. Martini gives a full account 

 of the process of encystation, including the degeneration of the nucleus 

 and the nucleolus-like bodies. Some interesting degenerative phenomena 

 are described ; it seems that over-feeding may be a cause. The question 

 of the secondary nuclei is discussed at length. 



Entamoeba Buccalis.f — S. Prowazek describes this amoeba which 

 occurs in the cavities of hollow teeth. It varies in size from 6-32 ft 

 and differs from E. coli in possessing a clearly differentiated ecto- and 

 endoplasm, and in its reproduction. 



Amoebae of Dysentery .$ — A. Lesage describes and compares with 

 Entamoeba coli an amoeba from the mucus of dysenteric patients in 

 Saigon and Toulon, which he regards as specifically different. Its 

 distinctive feature appears to be the nature of its ecto- and endoplasm, 

 the absence of multiplication of the nucleus into 8 parts (as occurs in 

 E. coli) and of the characteristic cysts of E. coli. 



Foraminifera of Shore-Sand of Sussex.§ — Arthur Earland gives 

 an account of his gathering of Foraminifera from the shore-sand 

 between tide-marks at Bognor, Sussex. It proved to be an unexpectedly 

 rich collection, predominantly milioline, including no fewer than 140 

 species, of which many are of rare occurrence in Britain, 15 are recorded 

 for the first time, and one is new — Spiroplectafusca. Both in the total 

 number of species recorded and in the number of rare forms, Bognor 

 will now take precedence of all other British collecting grounds. The 

 paper includes an account of the twin or " plastogamic " specimens of 

 Discorbina parisieiisis which were abundant. The two specimens united 

 in " plastogamy " are rarely the same in size and often markedly 

 different ; the apertures do not necessarily coincide, sometimes three or 

 four or more are united more or less irregularly ; in many instances the 

 two represent varying types, one being D. parisiensis, the other nearer 

 the more compact D. Wrightii. In two cases the young brood was seen 

 within the parent shell. 



New Rhabdosphere.|| — George Murray has found a new and 

 apparently very rare Rhabdosphere, which he calls Rhabdosplwra blaclc- 



* Zeitschr. wiss. Zool., lxxix. (1905) pp. 574-619 (3 pis.). 



t Arb. Kaiserl. Ges., xxi. (1904). See also Centralbl. Bakt. Parasit., xxxvi. 

 (1905) p. 646. J Ann. Inst. Pasteur, xix. (1905) pp. 9-16. 



§ Journ. Quekett Micr. Club, 1905, pp. 187-232 (4 pis.). 

 || Proc. Roy. Soc, series B, lxxvi. (1905) pp. 243-4 (1 fig.). 



