ZOOLOGY AND BOTANY, MICR0SC0P7, ETC. 787 



lie in the segments, so far as the cystocarpic branches are concerned. 



10. The auxiliary cell, which before fertilization is not specially marked, 

 is the cell next the Tragzelle, i.e. the second cell from the axil-cell. It 

 is probably identical with the third cell of the branch, reckoning from 

 the carpogonium, which makes the carpogonial branch only 2 -celled. 



11. The auxiliary cell fuses with the Tragzelle ; the process of fusion is 

 so lengthy, that the surrounding tissue is absorbed and reaches as far as 

 the third cell of the central axis. 12. The organs of attachment are 

 short thickened shoots. The Langtriebe, which normally stand opposite 

 the Kurztriebe, wither. Euzoniella incisa. 13. The cystocarps arise 

 generally on the lowest side-shoot of a Kurztrieb ; they may also arise 

 on the penultimate side-shoot. 14. The procarpia arise on the second 

 segment of the side-shoot of the Kurztrieb. Rhabdonia verticillata. 

 15. R. verticillata grows by means of a three-sided apical cell. 1G. The 

 cystocarp has been found, and its position is embedded in the thallus. 

 17. One-celled colourless hairs occur. They must be regarded only 

 as a secondary transitory character. Ergthroclonium Mueller i. 18. The 

 branches which grow out from the central axis, are not in two rows as 

 Harvey states, but in four rows. 19. There is a secondary growth in 

 thickness at the base of the principal shoot and the place of egress of 

 the larger branches. The layers are not to be regarded as annual rings, 

 but as'elements of solidity. Rhabdonia globifera. 20. The growth of 

 R. globifera, unlike that of R. verticillata, which has a single apical 

 cell, belongs to the " Springbrunnen-type." Its position in the genus 

 Rhabdonia is therefore hardly to be maintained. 21. Although, in 

 general, attempts to prove a direct plasma connexion have only given 

 negative results, the fact has been established in certain cases. 



Erythrocladia.* — N. Svedelius gives an account of Erythrocladia 

 irregularis Rosenv., which he found growing epiphytically on Furcellaria 

 fasiigiata. It was first described in 1909 as a Danish alga ; its distribu- 

 tion now includes Sweden. 



Batrachospermum growing on Molluscs.f — G. Bignotti publishes 

 a note on the occurrence of two forms of Batrachospermum found grow- 

 ing on shells of Planorbis in freshwater pools near Modena in the spring 

 of 1908, and cites similar records made by Teodoresco and Lemmermann. 



Colpomenia sinuosa.J — A. D. Cotton gives an account of the in- 

 crease of Colpomenia sinuosa in England. It is a brown alga of the 

 Indian Ocean and the warm Atlantic, and in recent years has migrated 

 up the west coast of Europe. On our coasts it was first noticed in the 

 Scilly Islands in August 1905, in Cornwall in the following year, spread- 

 ing later to Devon and Dorset. It does not appear to have travelled 

 east of Poole harbour. In the counties mentioned it occurs in consider- 

 able abundance in suitable stations. It is an inhabitant of sheltered 

 waters, and it reaches its maximum development in the winter months. 

 It grows epiphytically upon quite a number of algaB or attached to rocks 



* Svensk. Bot. Tidsskr., v. (1911) pp. 217-18. 



t Atti Soc. Nat. Modena, ser. 4, xii. (1910) 2 pp. See also Nuov. Notar., xxii. 

 (1911) p. 90. % Kew Bulletin, 1911, pp. 153-7. 



