420 SUMMARY OF CURRENT RESEARCHES RELATING TO 



west Africa, seven from Kiautschou, and three from Samoa. The 

 material from cultivated soil was richer in Cyanophycege than that from 

 uncultivated soil. 



Amphidinium.* — W. A. Herdman records the occurrence of Amphi- 

 dmiiim operculatum Clap. & Lach. in vast quantities at Port Erin, 

 Isle of Man. It formed a greenish-brown deposit on the sand during 

 last April, varying in quantity on different days. A. opercidatum has 

 only once previously been recorded as occurring profusely — at Norderney 

 — and has never been found on the British coasts. Specimens were 

 kept under observation at the Port Erin station, and were found to be 

 positively heliotropic. They are here described and figured. The cause 

 of their appearance in such quantity at Port Erin could not be explained. 

 In a postscript the author states that he visited the same region in June 

 and found the (apparently same) discoloured patch composed of a species 

 of Navicula, but could find no trace of Amphidinium. In September 

 the Amphidinium was back in abundance, and the diatoms were absent. 



Gymnodinium biciliatum.j — N. Ohno gives an account of his study 

 of Gymnodinium bici/iatum, a new fresh-water Feridiniuni found in the 

 botanic garden of Tokyo. He describes its variations in size, its cilia- 

 apparatus, its cyst-formation, etc. 



Trachelomonas. I — E. Naumann discusses the yellowish -brown 

 coloration caused by the microscopic alga, Trachelomonas volvocina, in 

 a pond at the Aneboda fish-culture station. 



New Rhizopodial Chrysomonad.§ — A. Pascher gives an account of 

 a colourless Rhizopodial Chrysomonad, describing its structure. He found 

 it in a culture-glass with (Edqwdium and other alg^. He considers it 

 to be akin to Lagynion ; and temporarily he names it Heterolagynion 

 CEdogonii. 



Heterogonium, a new genus. |1 — P. A. Dangeard gives the name of 

 Heterogonium {H. saliuum) to a new genus of algfe which developed in 

 sea-water to which some drops of " bouillon de morue " had been added. 

 The alga continues to grow in a Hquid composed half of sea-water, half 

 of Knop's liquid. Heterogonium appears to be related to Stichococcus, 

 from which it differs in its mode of multiplication by budding, and by- 

 its possession of a pyrenoid. This latter character and its marine habit 

 separate it from Coccomyxa. The budding is very rapid. Sometimes it 

 forms little chains of three or four ; sometimes little groups like Pleuro- 

 coccus. The cell- wall is coloured blue by iodine, but is with great difficulty 

 penetrated by stains. 



New Species of Euglena.lf — A. D. Hardy gives an account of 

 Eiigiena rubra collected near Melbourne in an artificial water-hole in 

 the summers of 1904-6. It is larger than E. viridis ; and the author 

 gives an account of its structure and life-history. 



* Journ. Linn. Soc. (Zool.) xxxii. (1911) pp. 71-5 (1 pi.). 



t Journ. Coll. Sci. Imper. Univ. Tokyo, xxxii. (1912) pp. 77-92 (1 pi.). 



+ Bot. Notiser, 1911, pp. 245-61. 



§ Ber. Deutsch. Bot. Gesell., xxx. (1912) pp. 152-8 (1 pi.). 



II Bull. Sec. Bot. France, Iviii. (1911) pp. B09-11 (fig.). 



TI Victoria Naturalist, xxvii. (1911) pp. 215-20 (1 pL). 



