ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 609 



(2) a review of past work, with a list of localities where former collec- 

 tions have been made ; and (3) a list of the localities worked by the 

 present author, with notes as to the predominant species occurring at 

 different levels. The paper is illustrated by two plates, and these are 

 followed by a list of bibliography. 



Algae of Bremen.* — F. Hustedt is working out the algal flora of 

 Bremen, and found the canal connecting Bremen with the neighbouring 

 fens to be rich in diatoms. He collected them for a full year. After 

 preliminary remarks on the topography of the canal, the colour and 

 temperature of the water, the frequent occurrence of certain species (in- 

 cluding some marine forms), etc., he describes the composition of the 

 plankton month by month, and gives complete lists of 53 species of algae 

 and 17-i forms of diatoms. 



Algae of Iowa.f — R. E. Buchanan gives a list of the alga? of Iowa, 

 with keys of the orders, families, subfamilies, genera, and species. He 

 records 18] species, with their localities. Iowa is pre-eminently a prairie 

 state, and the streams and lakes form but a very small proportion of its 

 area. The present list is compiled from specimens collected at many 

 different parts of the state, but there is still much material to be worked 

 through, and the list does not pretend to be complete in any way. One 

 of the groups of alga? having the widest and most general distribution is 

 the Diatornacea?, which will amount in the complete list to some hundreds 

 of species. Nest in abundance come the Myxophycea?. Of the genus 

 Spigogyra twenty-five species are recorded. 



African Algae.J — G. S. West publishes two papers on African alga?, 

 the first on the alga? of the Birket Qarun, Egypt, and the other on 

 phytoplankton from the Albert Nyanza. 



The collections from the Birket Qarun were made by Cunnington. 

 The Birket Qarun is a shallow lake, some 25 miles in length by 5 or (! 

 miles in breadth, and is situated in the Fayum province of Egypt. It 

 communicates with the Nile, and the water is brackish. Alga? were col- 

 lected from the shores and from ponds, swamps, and stagnant pools near 

 the shores, and from the inlets. The total number of species collected is 

 66, and the author attributes the small total to the brackish character of 

 the water. The Chlorophycea? are poorly represented ; the Myxophycea? 

 and Bacillariea? are more numerous, the respective number of species 

 being 14, 19, and 32. Two marine species were found, Polysvphonia 

 utricular is Zan., and a form of Enteromorpha plumosa. The majority of 

 the alga? were brackish-water forms, the only fresh-water species being 

 obtained from near the mouth of the Wady. Remarks are made on the 

 littoral alga-flora and on the plankton, which was mostly animal. Two 

 new species of alga? are described. 



The phytoplankton from the Albert Nyanza was collected by R. T. 

 Leiper, and contained 4<s species, none of which could be regarded as 

 dominant. About two-thirds of them also occurred in a collection from 

 near the bottom. A list follows, in which two new species are described. 



* Abhandl. Nat. Verein Bremen, xix. (1909) pp. 418-52 (12 figs.). 



+ Proc. Iowa Acad. Sci., xiv. (1909) 40 pp. 



X Journ. of Bot., xlvii. (1909) pp. 237-46 (1 pi.). 



