638 SUMMARY OF CURRENT RESEARCHES RELATING TO 



supposed. It possesses a very robust radical disc and is so firmly 

 attached to rocks that a storm or heavy seas are required to break it 

 off. Hence it is rarely found washed up. 



Floridess.* — J. B. De Toni publishes the third section of the fourth 

 volume of his Sylloge Algarum, which consists of Families V. and VI., 

 RhodomelaceaB and Ceramiacese. 



Marine Algae of Sicily .f — V. Spinelli publishes a first contribution 

 to the marine flora of Sicily, in which he enumerates 164 species, 37 of 

 these being new to the island. A list of synonymy and references to 

 literature are given under each species, together with its geographical 

 distribution in the Mediterranean and the localities where it has been 

 found in Sicily. In the introduction the author mentions the genera 

 which he has found characteristic of the three zones, into which he has 

 divided the region of vegetable life, according to the lines of Ardissone. 

 The first zone reaches from the high water-mark to a depth of three 

 fathoms, the second from 3-20 fathoms, and the third from twenty to 

 the lowest limit of marine vegetation. Certain species new to science 

 have been discovered, but the description of these is promised in a 

 later number. The microplankton of the Sicilian coast has not been 

 included, and the region explored has been confined to the eastern 

 shores between Syracuse and Messina. 



Fresh-water Algse of certain Lakes. J — 0. Amberg notes the occur- 

 rence in the Lago di Muzzano of 7 Myxophyceae, 8 diatoms, 14 species 

 of Chlorophycese, and 8 Peridiniese. The commonest form appears to 

 be Clathrocystis c&ruginosa Henfr., which is mixed with Anabama 

 Catenula B. and F., A. circinalis Hansg., Botryococcus Braunii Kiitz., 

 and Ccdo splicer ium Kuetzingianum Naeg. 



0. Zacharias § writes on the biological characteristics of the Klinker- 

 teich at Plon, and remarks on the poverty of alga?. He records 

 34 species, among them a new variety, Zachariasii Brum, of Stephano- 

 discus Hantzschicmus Grun. This variety is distinguished by the 

 presence of long siliceous seta? (50-70 /a) which are very fragile and 

 become detached in drying. They are inserted on small spines disposed 

 radially on the valve. 



H. Reickelt (| records 83 species and varieties of diatoms from the 

 Schohsee near Plon, among which are the new species Navicula Zacha- 

 riasi and Stauroneis tylophora. These are also figured. The author 

 seeks to explain the presence of certain species on geological grounds. 



R. Monti If publishes lists of diatoms and other algae recorded from 

 five small lakes in the region of the Val Formazza, called collectively 

 the Laghi Ossolani. 



E. Lemmermann ** has made a special study of four of the Plon 



* Sylloge Algarum, iv. sect. iii. (1903) pp. 775-1525. 



t Rendic. e Mem. R. Ace. Sci. etc. d. Zelanti Acireale, ser. 3, i. (1903) No. vii. 

 66 pp. 



X Ploner Berichte, 1903. See also Nuov. Notar., xiv. (1903) pp. 117-19. 



§ Loc. cit. || Loc. cit. 



\ 'Le condiz. fisic.-biol. d. laghi Ossolani. . . in rapp. alia Piscicultura,' Milano 

 c Pavia, 1903. 



** Forsch.-ber. d. Biolog. Stat. z. Plon ; Nuov. Notar., xiv. (1903) pp. 128-31. 



