ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 341 



maps. The presence of whaling stations does not seem to diminish the 

 quantity nor change the quality of the plankton. Five new species are 

 described in the systematic part of the paper. 



Studies on Cyanophycese.* — F. E. Fritsch gives the result of his 

 studies on the structure of the investment and spore-development in 

 some Cyanophycea3. He finds that each cell of the sporogenous filament 

 of an Anabama has two envelopes, and when cell-division takes place 

 the outer envelope is split into two by an intercellular septum. The 

 The nature of the two envelopes is described in detail. The exospore 

 and endospore of the spore are merely the outer cell-sheath and inner 

 investment respectively, both of which, in the mature condition, com- 

 pletely envelop the protoplast. In Oscillaria, the transverse septa are 

 less developed than in Anabama, and the cell-sheath, instead of splitting 

 during division, forms a coherent whole round the entire filament. The 

 sheath of Oscillaria and that of Lyngbya, are entirely different struc- 

 tures, the former being a coherent cell-sheath, while the latter is 

 homologous with the external mucilage of Anabcma. In Tolypothrix 

 and Rivularia, the actual filament is provided with a cell-sheath, wmich 

 is only in part coherent, and shows a very marked moniliform structure. 

 The intercellular protoplasmic connections of many observers are due to 

 changes produced in the gelatinous transverse portion of the inner 

 investment during staining. Under the heading of " General Conclu- 

 sions," the author discusses the mode of development of filamentous from 

 unicellular forms. 



Bkand, F. — Ueber Spaltkorper und Konkavzellen der Cyanophyceen. (On so-called 

 fission-bodies and concave cells in Cyanophycese.) 



Ber. Deutsch. Bot. GeselL, xxiii. (1905) pp. 62-70. 



C lerici, E. — Sopra una trivellazione eseguita presso Roma sulla via Casilina. (On 

 a boring effected near Rome in Via Casilina.) 



[In a depth of from 31 - 50 and 34 metres from the surface diatoms were found, 

 which included 36 species.] 



Atti Beal. Accad. Line, xiv. (1905) pp. 224-S. 



Dippel, L. — Diatomeen der Rhein-Mainebene. (Diatoms of the basin of the Rhine 

 and Main.) Braunschweig (Vieweg) 1905, 170 pp., 372 col. figs. 



Foslie, M. — Algologiske Notiser. (Alerological notes.) 



[On the systematic position of certain genera and species of Litho- 



thamnionese. Two new species and a new variety are described.] 



Kgl. Norske Vidensk. Selsk. Skrift. Trondhjem, 1904, pp. 1-9. 



,i „ Two new Lithothamnia. Op. cit., 1903, pp. 1-4. 



Gepp, A. & E. S.— Atlantic Algae of the ' Scotia.' 



[A list of 13 species collected by Rudmose Brown off 

 the coast of Brazil, at St. Paul Rocks, and St. Vincent, 

 Cape de Verde.] 



Journ. Bot, xliii. (1905) pp. 109-10. 

 „ „ Rhipidosiphon. 



[A note on the distribution of this plant, now known as 

 TJdotea javensis. It has hitherto only been found in the 

 Eastern tropics, but is here recorded as having been 

 found by K. Yendo in the province of Hiuga, Japan.] 



Tom. cit., p. 129 



* Beih. Bot. Centralbl., xviii. (1905) pp. 194-214 (1 pi.). 



