ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 493 



velopment in the kelps. It resembles the Lessoniatae in the sterile 

 branching. And in its sporophyll-proliferations it resembles the 

 branching of the Alariatse. Originally reproductive in character, these 

 proliferations in Egregia become floats and photosynthetic organs. 

 Lessoniopsis belongs clearly to the Lessoniatae, and is too highly 

 developed to be regarded as the common ancestor of the two diverging 

 lines Lessoniatae and Alariatse. 



Danish Species of Ceramium.* — H. E. Petersen has made a close 

 study of the species of Ceramium found on the Danish coasts ; and, in 

 spite of the difficulty of defining the species in view of the numerous 

 connecting forms, he has arranged them in a systematic sequence in 

 accordance with anatomical and external morphological characters. 

 There are nine species, one of which, G. Rosenvingii, is new to science. 

 The main factor in the key to the species is the degree to which the 

 cortex is developed. In one group it is regularly and distinctly 

 separated into zones, as in G. diaphanum ; in another group it is 

 distinctly zonate in parts only of the plant, as in G. fruticulosum ; in 

 the third group it forms a continuous coating over the whole plant save 

 at the apex and on the involucral branchlets, as in G. rubrvm. Some of 

 the forms of this latter species are probably due to modifications of the 

 salinity of the water. Several photographs showing the habit of the 

 various forms are provided in the plates, and the anatomical details are 

 figured in the text. The paper is in "Danish, with a resume in French. 



Corallinacege of California. — M. B. Nichols has been studying the 

 structure of the thallus and the development of the conceptacles in some 

 Californian species of crustaceous Corallines, and publishes the results 

 of his researches upon the species which has been named Melolesia 

 amplexifrons by Farlow (not Harv.), Lithophyllum zostericola f. medio- 

 cris and L. mediocre by Foslie, but which really is a Lithothamnion and 

 must be called L. mediocre Foslie and Nicholls. 



Anatomy and Classification of Corallinacese.l — R. Pilger publishes 

 a contribution to a knowledge of the Coralliriaoeae. During his visit to 

 the Berlin Aquarium at Rovigno on the Adriatic Sea he turned his 

 attention to the calcareous algae lately studied by Foslie and Heydrich, 

 and then examined freshly gathered material. He gives his results. He 

 passes under review the general conditions of growth of most of the 

 deep-growing species, and describes the anatomy of some eight species, 

 discusses the nature and development of the tetraspores and tetra- 

 sporangia, the development of the cystocarps, with reference to the 

 principles of classification of the Corallinaceae, the attempted establish- 

 ment of which by Heydrich and Foslie he criticises. He figures the 

 anatomical details of several species. 



Anatomy of Lithothamnion and Lithophyllum.§ -- P. Lemoine 

 publishes an interesting note on the anatomical characters which dis- 



* K. Dansk. Vidensk. Selsk. Skrift, scries 7, v. (1908) pp. 41-96 (7 pis. and 9 figs.). 

 t Univ. California Publications (Bot.) iii. (1908) pp. 311-8 (pi.). 

 % Engler's Bot. Jahrb., xli. (1908) pp. 241-69 (6 pis.). 

 § Comptes Rendus, clxviii. (1909) pp. 435-8 (figs.). 



