378 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Phycological Studies.* — M. A. Howe continues his studies of 

 West Indian algae, and in the present paper, No. IV., he treats first of 

 the genus Neomeris. He describes the genus and six species, of which 

 three are new, N. van Bossece, N. stipitata, and N. mucosa. Important 

 critical notes are appended to each diagnosis. The next section of the 

 paper is devoted to two West Indian species of Acetabulum, of the 

 Polyphysa section ; A. pusillum, a new species; and A. polyphysoides 

 Kuntze, with a new form, deltoideum. Then comes a description of a 

 new Halimeda, H. Jacrimosa, belonging to the H. Tuna group. A 

 section follows on Udotea conglutinata and U. cyathiformis, which the 

 author holds to be distinct species. He gives diagnoses of both, and a 

 key of the more important diagnostic characters. Finally, he describes 

 a new species of Udotea, U. spinulosa, and appends a note on U. pal- 

 metto. 



Movement of Diatoms.f — Otto Miiller continues his studies on this 

 subject, and in the present contribution deals with the structure of the 

 raphe, criticising the views of Otto Heinzerling, and giving the result 

 of his investigations on the topographical conditions of the raphe of 

 P in iiularia, founded on over 700 measurements of the larger species. 



Diatoms of Bremen. J— F. Hustedt publishes, as a contribution to the 

 algal flora of Bremen, an account of a rich haul of Bacillariaceae or 

 diatoms obtained from a pool in the environs of Bremen. Fifty-nine 

 species were obtained, and the list may still be incomplete. 



Fresh-water Plankton of Italy and Germany.§ — E. Lemmermann 

 publishes three further contributions to a knowledge of the plankton 

 alga. 1. In article 23, he treats of the phytoplankton of the Lago di 

 Varano and of the Lago di Monate, which lie to the north-west of 

 Milan. The material was gathered by 0. Besana ten years ago. The 

 periodicity of the chief forms is worked out and shown in tables : and 

 the relation of this to the conditions of temperature is considered. The 

 shallower Lago di Varano (7| metres) resembles in the composition of 

 its plankton the shallower lakes of North Germany. And the deeper 

 Lago di Monate (27 metres) has an alpine character. 2. In article 24, 

 the author gives an account of the material gathered at eleven stations 

 in Silesia by D. Schmula. 8. In article 25, he treats of the algae of the 

 Stralsund water-supply, which is brought from the Borgwall Lake, 

 distant 6 to 7 kilometres. He describes the species found in the lake- 

 water, in the sand of the filter-bed, and in the gravel of the same. 



Phytoplankton of Victoria Nyanza. || — C. H. Ostenfeld writes on 

 some phytoplankton from the Victoria Nyanza gathered by A. Borgert 

 in 1904-5. He finds the species of Microcystis to be ill-defined. M. 

 seruginosa, and M. viridis Lemm. and M. ffos-aquse Kirchn. cannot 

 be separated. The data of West and Schmidle on Microcytis-f orm.8 in 

 plankton from Victoria Nyanza and Lake Nyassa are to be referred to 

 one species. The tw r o species of Cothurnia, described by E. von Daday 



* Bull. Torr. Bot. Club, xxxvi. (1909) pp. 75- 104 (8 pis.). 



t Ber. Deutsch. Bot. Gesell., xxvii. (1909) pp. 27-43 (1 pi. and text figs.). 



% Abh. Nat. Ver. Bremen, xix. (1908) pp. 353-8. 



§ Arcb. f. Hydrobiol. u. Planktonkunde, iii. (1908) pp. 349-410 (figs.). 



II Engler's Bot. Jabrb., xli. (1908) pp. 330-50 (figs.). 



