ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 330 



probably present on the coasts of France, with which he deals. Addi- 

 tional information has been gathered from the MS. of Van llenrck's 

 Prodromus of the marine alga? of north-west France and from Malard's 

 notes on Tatihou, which were both at the disposition of the author. A 

 Florule of Tatihou forms an appendix to this volume. Interesting 

 topographical and distributional notes are given in the introductory 

 portion. 



Algae of Lake Baikal.* — V. Dorogostai'sky has made a careful 

 examination of the alga? of Lake Baikal and its basin. He finds that 

 the monotony and small number of species represented form a marked 

 feature. This want of variety does not apply to Diatomaceae, which 

 forms 87 ■ 5 p.c. of all the vegetable organisms. He notes the extra- 

 ordinary size attained by Draparnaldia, which surpasses its ordinary 

 length by 2-?> times. Ulothrix zonata is also widely spread, as well as 

 Tetraspora bullosa, var. cyJindracea. Species of Conjugatae are very 

 rare ; as also Pkycochromaceaa, with the exception of Microcystis olivacea, 

 which occurs in masses in certain parts of the lake at certain seasons. 

 The author divides the area of Lake Baikal into four zones — the shore, 

 the bottom, the open deep water, and the plankton, and treats of the 

 characteristic forms of each. The flora of adjacent lakes, springs and 

 rivers is described. The systematic portion of the paper includes 

 records of 850 species, of which 200 are diatoms, a few being new. 



Antarctic Algae, f — A. and E. S. Gepp publish a list of the marine 

 algae brought home from the South Orkneys by the Scottish Antarctic 

 Expedition. These represent 12 species, of which 4 are new, one being 

 the type of a new genus (Leptosarca). A second species of that genus 

 is Halosaccion dumontioides Harv., which has hitherto only been 

 recorded from the far north. A new species of Lessonia is described, 

 with laminae 1-8 metres long. Some of the algae here described were 

 brought back by the British Antarctic Expedition, among them being a 

 new species of PhyUopltora, not found by the ' Scotia.' 



Acrochaetium and Chantransia.J— Ed. Bornet begins by pointing out 

 that Ghantransia corymbifera Thuret, described in the ' Liste des Algues 

 Marines de Cherbourg ' of Le Jolis (p. 107), really includes two different 

 species. One is epiphytic on Geramium rubrum, and the other grows as 

 a semi-endophyte on Hehninthocladia. The latter is the true Ghantransia 

 corymbifera, while to the former is now given the name of C. e(/!orescens 

 var. Thuretii. Both are figured. The remainder of the paper is devoted 

 to an analysis of the genera Ghantransia and Acroclmtium. The author 

 considers that both names should be retained as genera : Achrochcetium 

 to designate those species which are reproduced by monospores only ; 

 Ghantransia, for those species which have also sexual reproductive 

 organs. A table is given of the sections into which both genera may be 

 divided, with the species contained in each ; and references to specimens 

 published in all the principal exsiccata are appended to the species- 

 names. 



* Bull. Soc. Imp. Nat. Moscow, ii. and iii. (1904) pp. 229-65 (1 pi.). 



t Journ. of But., xliii. (1905) pp. 105-9 (1 pi.). 



X Bull. Soc. Bot. France, li. (1904) pp. xiv.-xxiii. (1 pi.). 



_' A 2 



