ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 543 



Kidderminster. The dominant algfe of the pool are BacillariefB, con- 

 sisting of 19 genera and 40 species. The Chlorophycete and Peridiniese 

 are few, and the Myxophyceffi are fairly well represented. In addition 

 to charts showing the periodicity of the different groups, the author 

 gives one of the temperatures of the water and air, and a general table 

 of the algal flora. Five species are of special interest. 



Irish Fresh-water Algae.* — W. West writes a report on the fresh- 

 water alg£e of Clare Island and the adjacent mainland, with a supplement 

 on the marine diatoms. He records 769 fresh-water species, and 118 

 marine diatoms. He describes and figures six new species. This forms 

 one of the reports of the survey of the entire natural history, etc., of 

 Clare Island. 



Russian Algae. — A. A. Elenkinf publishes a preliminary report on 

 the lower Cryptogams of the environs of Michailowskoje in the Moscow 

 district during 1910. He pays special attention to the algse which con- 

 stitute the " water-bloom." Interesting among the recorded species are 

 Anabeena scheremtievi, a new species of Gharacium, Mastigocoleus testa- 

 rum var. aquse-dulcis. 



The same author | records some new and rare algae from the middle 

 of Russia. Gylindrospermum michailovsTcoense is a new species. Its 

 microscopic characters are described. 



Fresh-water Algae of S.W. Africa. § — Gr. S. West gives an account 

 of the fresh-water algas collected by H. W. Pearson in Angola, Namaqua- 

 land, etc., 140 species in all. Among them are described and figured 

 seven new species and some new varieties, also the new genus Ecdysi- 

 chlamys, allied to Oocystis. 



Holdfasts of Ulva. || — E. M. Delf describes the attaching disks of a 

 species of Ulva, their mode of development upon other algae, and their 

 penetration into the tissue of the supporting alga. The latter feature 

 leads her to an assumption of the parasitic or saprophytic character of 

 these filaments. These holdfasts are very tenacious of life, and in places 

 like Belfast Lough, where Ulva constitutes a nuisance, some method of 

 destroying these disks must be found if the alga is to be exterminated. 



Chromatophores of Fucoidese.lT — F- Nicolosi-Roncati writes on the 

 genesis of the chromatophores of the Fucoidese. He alludes to the works of 

 previous authors on chloroplasts and leucoplasts, distinctly demonstrates 

 that leucocytes never differentiate themselves ex novo in the substance of 

 the cytoplasm, but are the result of elements pre-existing in the histo- 

 genic cell, and are analagous to the mitochondria of animal cells. 



* Proc. R. Irish Acad., xxxi. pt. 16 (1912) 62 pp. (2 pis.), 

 t Bull. Jard. Imp. Bot. St. P6tersbourg, xii. (1912) pp. 46-9. 

 X Bull. Jard. Imp. Bot., St. P6tersbourg, xi. (1911) pp. 162-70. 

 § Ann. S. African Mus., ix. (1912) pp. 61-90 (2 pis.). 

 II Ann. of Bot., xxvi. (1912) pp. 403-8 (1 pi. and figs.). 

 1[ BuU. Soc. Bot. Ital. (1912) pp. 144-9 (figs.). 



