540 Algae. 



On making a study of knob-like ramelli which are formed 

 in number on the apices of ramuli and which have been taken 

 for antheridia by Holmes (J. Lin. Soc. Bot. Vol. XXXI. p. 25b. 

 PI. VIII. Fig. 4), the author concludes them to be bodies des- 

 tined for vegetative propagation, as they are richly provided 

 with starch grains and are constructed so as to be very easily 

 detached. Of the systematic position of Chondria crasslcaulis, 

 the author is for from agreeing with J. Agardh's opinion (Ana- 

 lecta algologica 1892. p. 161), as the character of the growing 

 apex, presence of the basal cell of hair-leaves and structure 

 of the tetrasporangium show its Chondrian nature. 



Okamura. 



Ostenfeld, C. H., Phytoplankton from the Sea around 

 the Faeröes. (Reprinted from „Botany of the Faeröes. II. 

 Det Nordiske Forlag. Copenhagen 1903. p. 558—612. With 

 27 fig. in the Text. Separates issued 25. Februar 1903.) 



This treatise is based upon the examination of 91 plankton- 

 samples collected partly in the Ocean around the Faeröes partly 

 in the fjords and the sounds of these islands, in the years of 

 1897—1902. 



The list of the species contains 54 Diatoms, 5 Ptero- 

 spermataceae, 27 Peridiniaceae, 1 Coccolithophora, 2 Flagellata 

 and 2 Chlorophyceae {Halosphaera and Pachysphaera). 



Of the D i a t o m s the following genera are interesting from systematical 

 point of view ; Thalasslosira with the species T. subtilis (Ostf.) Gran and 

 T. bioculata Grün.) Ostf. n. nom ; of the last-named the auxospores are 

 described and figured ; Rhizosolenia with the new species R. faeroensis 

 Ostf. Further the genus Cliaetoceras has been divided into sections; it 

 is the first attempt to form natural sections of this genus which has of 

 all plankton-genera the greatest number of species. The subgenera 

 Phaeoceras and Hyalochaete created by Gran, are maintained. All the 

 hitherto known species are placed in sections which numbers are 20, viz. : 



I. Subgen. Phaeoceras: 1. Atlanticae, 2. Boreales. II. Subgen. Hya- 

 lochaetae : 3. Oceanicae, 4. Cylindricae, 5. Similes, 6. Constrictae, 7. Pro- 

 tuberantes, 8. Stenocinctae, 9. Subtiles, 10 Lacimosae, 11. Communes, 

 12. Curvisetae, 13. Diademae, 14. Tortae, 15. Compressae, 16. Diversae, 

 17. Furcellatae, 18. Anastomosantes, 19. Sociales, 20. Simplices. 



Among the Pterospermataceae, P. labyrinthus Ost is described. 



With regard to the Peridiniaceae some of the species of Peridinium, 

 subg. Protoperidinium are figured. Further the Ceratiums of the Sectio 

 Tripos are figured, and the new species C. neglectutn Ostf., the new 

 forms C. tripos f. atlantica Ostf. and f. subsalsa Ostf., b. longipes, f. 

 oceanica Ostf. and f. baltica Ostf. and C. longipes var. ventricosa Ostf. 

 are described. 



Coccosphaera atlantica Ostf. is included in Coccolithophora pelagica 

 (Wall.) Lohm., and Halosphaera minor Ostf. in H. viridis Schmitz. 



The more common forms are placed in 9 tables, in which 

 the frequency of the forms is indicated by the usual Symbols 

 (cc, c, -4-, r, rr); the rarer forms are enumerated after the 

 tables. With regard to the greater part of the samples the 

 temperature and salinity of the water are given. 



The tables show that the plankton associations succeed 

 rather regularly during the years. In the Ocean we have in 



