ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 305 



from albuminoid components of the sponge or of its juice. A tyrosin 

 ferment also occurs in Donatio, (Tethya) lyncurium and Geodla cydonium 

 {Cydonium gigas). 



Cotte also notes the presence of small quantities of manganese in 

 Renter a and Suberites, and of iron in Donatio, (Tethya) and Suberites. 

 The occurrence of iron in Spojigilla is denied. 



Indian Triaxonia.* — F. E. Schulze gives in his usual fine style an 

 account of the Indian Triaxonia collected by the ' Investigator.' The 

 memoir has been expertly translated by P. von Lendenfeld, and the 

 plates are of great excellence. 



Protozoa. 



Nuclear Emissions in Protozoa.f — A. Conte and C. Vaney have 

 studied Opalina intestinalis Ehrbg., from the intestine of Triton tceniatus, 

 which exhibits in its cytoplasm numerous granules like the multiple 

 nuclei described in Opalina ranaram Ehrbg. 



The nucleus is primitively single and very large, oval in form, and 

 bounded by a very distinct nuclear membrane. In some it doubles, 

 but in most the nuclear membrane disappears over a certain area, and 

 through this opening numerous chromatin granulations escape into the 

 cytoplasm. The history of these emissions is described ; it corresponds 

 generally to that of zymogen granules in the glandular intestinal cells 

 of the newt. 



Probably the vitelline nuclei in the ova of insects, myriopods, verte- 

 brates, &c. are of a similar nature, — pseudo-nuclei, simply nuclear 

 emissions. The authors' researches lead them to conclude that the 

 nucleus participates directly in forming granules of zymogen and ergas- 

 toplasmic products. It has therefore an important role in digestion, 

 whether intra-cellular or extra-cellular. 



New Rhizopod.J — E. Penard gives a preliminary description of 

 Glathrella foreli g. et sp. n., a new Pdiizopod from the Lake of Geneva. 

 It has some resemblances to Thecamoebaa and others to Heliozoa. The 

 cell is surrounded by delicate flexible siliceous cupules, compressed by 

 mutual pressure. Where the pieces join, there radiate out long, filiform, 

 often bifurcate or ramified pseudopodia, like those of Euglyphina. The 

 food consists chiefly of diatoms, ingested by the temporary separation 

 of pieces of the envelope. The nucleus is exceptionally large, the 

 plasma includes several large contractile vacuoles. Young forms were 

 seen, with six cupules forming a regular cubical capsule. 



Nuclear Division of Amoeba.§ — P. A. Dangeard notes that there 

 is considerable diversity in the mode of nuclear division in species of 

 Amoeba; thus among those which exhibit " teleomitosis " some are 

 characterised by the disappearance of the nucleolus at the prophase, 

 while in others the nucleolus separates into two halves, one persisting 

 at each pole of the spindle until the anaphase. In Amoeba glekhenii 

 the telomitosis does not differ appreciably from what is seen in the cells 



* Publications of the Indian Museum, Calcutta, 4to, 113 pp. and 23 pis. 



+ Coinptes Rondus, cxxxv. (1902) pp. 1365-0. 



J Arch. Sci. Phys. Nat., xiv. (1902) p. 554. 



§ Tomptes Rendus, cxxxv. (1902) pp. 1126-8. 



