ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 407 



that it has nothing to do with Spermothamnlon roseolum. He describes 

 certain cells in TraiUiella with special contents which are lacking in 

 Spermothmnnion. The cells of the former are twice as long as wide, 

 those of the latter five to ten times. Kucknck considers that the 

 S. roseolum described by Kyhn* in 1915 corresponds to T. intrkata. 

 The author here shows that the two species are quite distinct. 



Nemalion multifidum.f — -H. Kylin discusses the fertilization and 

 reduction-division of Nemalmi nndtifidum, comparing its nuclear be- 

 haviour with that of Scinaia. The species is generally dioecious, but 

 occasionally is monoecious with a smaller proportion of spermatangia 

 than are found on purely male plants. The author gives an account of 

 the spermatangia, the fusion of the male and female nuclei, the evolu- 

 tion of the carpogonia and the development of the gonioblasts, etc. 

 The germination of the carpospores is of the Chantransioid type. 



Thuretella Schousboei.J — G. B. de Toni publishes a short note on 

 Thuretella Schousioei, a specimen of which was collected in July 1916 

 by Sig. Maccagno at Sestri Ponente near Genoa. He gives a short 

 history of the species from its discovery at Tangiers in 1829 by 

 Schousboe to the present, and remarks on its limited distribution in the 

 Atlantic (Biarritz) and the Mediterranean. He hopes that this note 

 may draw attention to the species and may lead to a search for possible 

 tetrasporic plants. 



Bonnemaisonia asparagoides.§ — H. Kyhn writes on the life-history 

 and systematic position of Bonnemaisonia asparagoides, the structure of 

 the thallus, somatic karyokinesis, development of the spermatia, the 

 carpogouial branches, fertilization and chromatic reduction and develop- 

 ment of the cystocarp. He regards the systematic position of the genus 

 as being possibly near to Naccaria. Finally, he discusses the alternation 

 of generations in alg^e, as exemplified in Ghlamydomonas, CEdogonimn, 

 Coleochsete, Spirogyra, Dictyota, CutUria, Laminaria digitata, and Fucus. 



Calcareous Alg-se.! — Mme. P. Lemoine reports on the calcareous 

 algtB collected on the Danish Oceanographical Expeditions, 1908-10, to 

 the Mediterranean in the " Thor." Specimens are recorded from Sicily 

 and Greece in 1908 ; from Spain, Malta, Tripoli, Derna, Tenedos, Sicily, 

 Sardinia, the Balearic Islands, Algeria and the Atlantic coast of France 

 in 1910. Critical remarks on morphology and geographical distribution 

 are appended. 



* Ark. f. Bot. xiv., No. 5 (1915) p. 4. 



t Ber. d. Deutsch. Bot. GeseU., xxxv. (1916) pp. 257-71 (figs.). See also Nuov. 

 Notarisia, xxviii. (1917) p. 136. 



X R. Comit. Talassogr. Ital., Mem. Iviii. (1917) 7 pp. 



§ Zeitschr. f. Bot., viii. (1916) pp. 545-86 (11 figs.). See also Nuov. Notarisia, 

 xxviii. (1917) p. 133. 



II Report on the Danish Oceanographical Expeditions, 1908-10, to the Medi- 

 terranean and adjacent Seas, ii. Biology (Copenhagen, 1915) 30 pp. (1 pi. and 

 10 figs, in text). See also Nuov. Notarisia, xxviii. (1917) pp. 129-31. 



