ZOOLOGY AXD BOTANY, MICROSCOPY, ETC. 73 



Sexual reproduction ; Resting state : Germination of the hjpnozygotes. 

 Details are given of experiments to show that lander certain unfavour- 

 able conditions the zygotes undergo a period of repose. This fact was 

 not previously known. This is the first instalment of the paper which 

 will be continued in a later number. 



Colpomenia sinuosa.* — Fabre-Domergue gives an account of the 

 remarkable invasion of the oyster beds at the mouth of the Vannes by 

 Colpomenia sinuosa. It appeared for the first time last year in the Gulf 

 of Morbihan, its nearest locality being Cadiz. Its presence at Vannes 

 is seriously prejudicial to the interests of the oyster growers, for the 

 plant settles on the shell of the oyster, and when the tide goes down it 

 becomes emptied of its contents and filled with air. Adhering so firmly 

 as these plants do to the oysters they act as floats when the tides are 

 high ; and the oyster comes to the surface and is carried away. The 

 result threatens to be a serious injury to the oyster trade. 



Acrochsetium and Chantransia.t — F. S. Collins arranges the North 

 American marine species of these two genera according to the principles 

 of Mons. Bornet's paper, with descriptions of each species. The 

 paper in question was published a short time ago in the " Bull. Soc. Bot. 

 de France," and contained full descriptions of only two species, though 

 copious references are made to herbarium specimens in exsiccatse, etc. 

 F. S. Collins' paper, therefore, is, as it were, a continuation of Mbns. 

 Bornet's work. Only twelve species have been recorded as yet from 

 North America including the West Indies, and these are here fully 

 described, and keys are given. The classification is based largely on the 

 cliaracters at the base of the filament, whether it arises from a single 

 cell, or from a cellular disc, or from horizontal branches, attached to the 

 host. Two new species are described — Acrochmtium Dasym and A. 

 DictyoUe. Keys to the two genera are given. 



Artari, a. — Der Einfluss der Konzentration der Nahrldsungen auf die Ent- 

 wickelting einiger griiner Algen. (The effect of concentration of nutritive 

 solutions on the development of certain green algte.) 



[The species in question were Stichococcus bacillaris, gonidia of Xanthoria 

 parietina, and Chlorella communis, a new species resembling C. vulgaris^ 



Jahrb. f. Wiss. Botan., xliii. (1906) pp. 177-214. 



EwART, A. J. — Notes on a Collection of Marine Algae from King Island. 



[A list of 32 species from King Island, Bass Strait, collected by Mrs. Spong 

 and named by Mr. A. H. S. Lucas. There are no novelties.] 



Victorian Naturalist, xxiii. (1906) pp. 90-1. 



Gaidukov, N. — Die komplementare chromatische Adaptation bei Porphjrra und 

 Phormidium. (Complementary adaptation in Porphyra and Phormidium) 

 [The results of spectroscopic experiments on these two algae.] 



Ber. Deutsch. Bot. Gesell, xxvii. (1906) 1 p. 



Haberlandt, G. — Ueber den Geotropismus von Caulerpa prolifera. (On the 



geotropism of C. prolifera.) SB. k. Akad. Wiss. Wien, cxv. (1906) pp. 577-89. 



* Comptes Eendus, cxliii. (1906) pp. 1223-5. 

 t Ehodora, viii. (1906) pp. 189-96. 



