70 SUMMARY OF CURRENT RESEARCHES RELATING TO 



discussion regarding the position of the various forms, varieties, and 

 species. Critical remarks are made with regard toother allied species 



of Char a. 



Chara stelligera.* — A. Bennett records the finding of Chora stel- 

 ligera in good fruit near the bridge between Flegg Burgh and Filby. 

 He also records seven other localities in Norfolk, and others in Hants, 

 Surrey, and South Devon. 



Algae from the Laboratory at Roscoff.f— 1\ A. Dangeard records 

 the finding of Prasinocladus lubricus Kuckuck and Euglenopsis subsalsa 

 Davis in the tubs of the aquarium at the laboratory at Boscoff. The 

 former has only been recorded from Heligoland and the latter from 

 Cambridge, Mass. Both species have been incompletely known, and 

 the present paper completes our knowledge of them as well as rectifying 

 certain errors with regard to them. Both genera have been placed in 

 the Tetrasporese, together with Ecballocystis and Gollinsiella. Their 

 affinities, in the opinion of the author, are, however, with Chlamydo- 

 monas and Carteria, the differences in the reproductive cells being due 

 to a localization in the secretion of the gelatine. If this view be 

 adopted, the family Chlorodendraceae proposed by Oltmanns in l'.»04 

 would take its place, like the Chlamydomonadinese, at the bottom of 

 the Algse, near the Flagellates. At Roscoif, the two species form a 

 moss-like growth on the glass walls of the vessels, and are much 

 appreciated as food by some of the animals living therein. 



Pleodorina illinoisensis Kofoid.J — F. Merton gives an account of 

 the structure and reproduction of Pleodorina illinoisensis Kofoid, a 

 North American species which has been found in the neighbourhood of 

 Heidelberg and in the Pfalz. It is an instance of the oft-repeated 

 assertion that most Protista, being cosmopolitan, are not of value in 

 distribution-studies. The material was properly fixed and various 

 histological details were made out : for instance, the movement of the 

 nucleus to the periphery of the cell and its karyokinesis. Centrosomes 

 were not observed. Conjugation of microgametes and macrogametes 

 occurs ; the resulting zygotes secrete a firm wall and become zygospores. 



Raphidonema.§ — A. Scherffel describes a new species of Raphidonema, 

 R. brevirostre, found in dirty snow in the Hohe Tatra, at a height of 

 1700 metres. The snow contained also Chwnaster nivalis and the 

 aplanospores of Pteromonas nivalis Chod. The characters of the new 

 species are : length of Hlaments 52-5(5/*, breadth 4/x, not so long drawn 

 out as in R. nivale Lag. ; in every cell a yellow-green chromatophore ; 

 reproduction normally by division of the filament in the middle into 

 two halves. Young germinating swarm-spores were observed. In the 

 interior of the cell are fat-drops but no pyrenoid. Raphidium nivale 

 Chod. is a typically one-celled organism ; Raphidonema nivale Lag. is 

 typically many-celled. The latter plant has cliromatophores, and is 

 consequently no fungus. " Bed snow"' lias never been observed in the 

 Hohe Tatra. 



* Trans. Norfolk and Norwich Nat. Soc, ix. (1910) pp. 49, 50. 



t Comptes Rendus, cli. (1910) pp. 765-7. 



j Zeitschr. wiss. Zool., xc. (1908) pp. 445-77. 



§ Botan. kozleme'nyek, ix. (1910) pp. 116-23. See also Hedwigia, 1. (1910) p. (101). 



