ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 281 



animal world all seven main lines are represented. • All plankton forms 

 strive so far as is possible to counteract the tendency to sink, and this is 

 carried out in many different ways. The. utility of plankton to mankind 

 is mainly indirect. 



British Flagellatse.* — F. E. Fritsch, appreciating the many new 

 and interesting Flagellatae discovered in Continental fresh-waters by 

 Klebs, Lemmermann, Pascher and others, has been led to investigate 

 British waters more carefully, and in the first of a proposed series of 

 papers publishes some of his results under the following headings : — 

 1. Isococciis spJiagnicolus nov. gen et sp. Yolvocacearum. 2. Gkryso- 

 coccus tessellatus sp. n. 8. On some forms of Cryptomonas. 4. On two 

 species of Lepocinclis (Eugleninese). Besides the above novelties he 

 describes also Cryptomonas Richei and C. anomala, and Lepocinclis salina. 



Organisms of Manchester Water-Supply, f — C. Turner publishes 

 an address delivered on the microscopy of the Manchester Water-Supply, 

 and gives a list of organisms found in Manchester water, including 

 desmids, diatoms, Chlorophycese, Cyanophycese and Peridiniea?. The 

 records were made in September and October, 1913. Notes by E. 

 Batty on the plankton of Manchester water in January to November, 

 1907, and January, 1908, are appended to the paper. 



British Fresh-water Algse.J— G. S. West publishes a further 

 series of algological notes as follows : xiv. Some species of the Volvo- 

 cineae— new records for Britain, including two species of Chlamydomonas 

 new to science, xv. Observations on the structure and life-history of 

 Mesotsenium caldariorum Hansg. He found this very rare desmid in 

 Wyre Forest, and describes his method of cultivating it subaerially, and 

 tells of its structure, cell-division, conjugation, and of the germination 

 of its zygospores ; the family Mesotgeniaceae proposed by Oltmanns is of 

 no value, xvi. Two new species of Ulothrix. xvn. The genus Tetra- 

 desmus. This was described by G. M. Smith in 1913, and forestalled 

 VictorieUa, created by Woloszynska in 1914. It belongs to Selenastrese, 

 a sub-family of Autosporacete. It is allied to AnJcistrodesmus, and con- 

 tains three species : — 1. Tetradesmus wisconsinmsis Smith, from North 

 America and Norway. 2. T. Ostenfeldi Woloszynska, from Victoria 

 Nyanza. 3. T. cumbricus, a new species from the plankton of Enner- 

 dale Water. 



Euglena oxyuris.§ — L. B. Walton describes the process of cell- 

 division and the formation of paramylon in Euglena oxyuris Scbmarda. 

 The various stages are described and figured, and the time occupied in 

 the division of an individual was Qh hours. The author considers that 

 the time may vary according to surrounding conditions, especially 

 temperature and nourishment. He describes a peculiar phenomenon in 



* New Phytologist, xiii. (1914) pp. 341-52 (3 figs.). 



t Manchester Micr. Soc, Ann. Rep. and Trans., 1913 (1914) pp. 44-58 (1 pi.). 



% Journ. Bot., liii. (1915) pp. 73-84 (7 figs.). 



§ Ohio Naturalist, xv. (1915) pp. 449-451 (1 fig.). 



