602 SUMMARY OF CURRENT RESEARCHES RELATING TO 



The basal mud is covered with a thick felt of OmUatorim and Anthro- 

 sptra Jenneri, which harbour a number of diatoms. The floating flora is 

 generally poor, mainly consisting of tychoplankton and heloplankton 

 elements. 



Plankton of the Plitvicer Lakes. *^ — J. Krmpotic writes an account 

 of the plankton of the Plitvicer Lakes in September and October. In 

 the Proscansko Lake he found Fragilaria crotonensis markedly predomi- 

 nating. In the month of June Asterionella fonnosa var. gracUlima pre- 

 dominates. The author found two types of that species, one measuring 

 105 /A in length, the other 70 /x, the latter being the more common. 

 Dinobryum and Cydotella were present in quantity. Of Geratium cor- 

 niitum, the summer-form was more common than the winter-form. In 

 the " Malo Jezerce " the winter-form predominates. There was a con- 

 siderable number of Chroococcacese. This paper is written in the 

 Croat language. 



Portuguese Diatoms. f — L. Lopo de Carvalho continues the work 

 on Portuguese diatoms begun so ably by C. Zimmerman. The present 

 paper continues the account of the structure, the methods of collection 

 and preparation, and gives a list of the gatherings made in the environs 

 of Guarda, north of Serra da Estrella. Finally, there is a systematic 

 list of the 177 species studied. 



Systematic Arrang-ement of Protococcales.J^ — J. Brunnthaler writes 

 on the systematic arrangement of the Protococcales (Chlorophyceas). 

 He reviews the important work of Chodatin 1902, and the later systems 

 of G. S. West and Oltmanns in 11J04, Bessey in 1905 and Collins in 

 1909. The most valuable work of all on the subject was that of Wille 

 (Nachtrag. Engl. & Prantl, Pflanzenfam., 1909), whose views are here 

 discussed, tlie author indicating the points on which he holds different 

 views. Remarks are made on the principal characteristics of the Proto- 

 coccales — chromatophore, nucleus, reproduction, etc. Finally, the 

 author draws up a synopsis of the group, the Zoosporinse containing five 

 families, the Autosporinae ten. 



Chlorophyce8e.§ — W. Migula publishes a book as an aid to the 

 determination of the commonest species of the Chlorophyceae. He in- 

 cludes the Conjugatas, but excludes Mesota3niace9e and Desmidiaceae, 

 which he has treated elsewhere in a corresponding volume. The species 

 are clearly described, and details are given as to their method of repro- 

 duction, occurrence, and habits. Many of them are figured. An intro- 

 duction has been added by G. Stehli, wherein he describes simply the 

 best methods of collecting and preserving material ; an addition to the 

 book which will make it useful to amateurs. 



* Glasnik Hrvatskoga prirodosl. drustva, xxv. (Agraiii, 1913) p. 1-29. See also 

 Bot. Centralbl., cxxiii. (1913) p. 140. 



t Rev. de Univers. Coimbra, i-ii. (1913) (pis. and figs.). See also Bot. Centralbl., 

 cxxiii. (1913) p. 326. 



X Verb. k. k. Zool. Bot. Gesell. Wien (1913) pp. 76-91. 



§ Die Griinalgen. Stuttgart: Franckb. (1912)74 pp. (8 pis.). See also Bot. 

 Centralbl., cxxiii. (1913) p. 271. 



