468 SUMMABY OF CURRENT RESEABCHES RELATING TO 



bhe speedy death of both Vorticella and Anakena. Chlamydomonas 

 inheerms grows in nests of four or more cells in the coils of Anabmia. 

 The cells arc ovate, 7-13 p long and 3-12 /x broad, and they all lie 

 with the pointed anterior ends turned towards each other. The 

 posterior end contains a green, bell -shaped chromatophore, within 

 which is a large pyrenoid. In the angle of the chromatophore lies the 

 nucleus, and in the anterior end are two pulsatile vacuoles. Motile cells 

 possess a distinct eye-spot. The author quotes Dill's and Chodal's 

 synopsis of the species, points out wherein his species differs, and gives a 

 diagnosis of it. 



Chlamydomonas.* — J. L. Serbinow describes a new method of 

 cultivating species of this genus, with the help of its symbiosis with 

 Saprolegniacea? and their accompanying bacteria. He pours spring 

 water into a large Koch basin, adding water which contains Chlamy- 

 domonas. In this he places ants' eggs or meal-worms, which are infected 

 with Saprolegniaceaa. After a time the culture of Chlamydomonas 

 develops strongly, and lasts a considerable time. 



The author describes in the same paper a new form of Chlamy- 

 domonas stellata, which is devoid of pyrenoids. He regards C. reticulata 

 as representing merely a form, without pyrenoids, of another species of 

 the genus. 



&* 



Bisschop van Tuinen, K. — Tets over de Diatomaceen. (Remarks on Diato- 

 macese.) Het Nederl. Zeewezeiu iv. (1905) pp. 65-8. 



Borgesen, F. — Om Faerbernes Algevegetation. Et Gensvar. (On the algal vege- 

 tation of the Faeroes. A reply.) Bot. Notiser. Lund, 1905, pp. 25-6. 



Borzi, A. — Generi nuovi di Chroococcacee. (New genera of Chroococcaceae.) 



[The author establishes the two new genera Planosphxrula with species P. 

 nutans, and Bacularia with species B. coerulescens. The former is allied 

 to Microcystis, Ccelosphterium, and Gomphosph&rea, and occurs in fresh 

 water. The latter resembles Dactylococcopsis, and occurs on fronds of 

 marine algaa in Sicily.] Nuov. Notar., xvi. (1905) pp. 20-1. 



Breemen, P. J. v a n.— Plankton van Noordzee en Zuiderzee. (Plankton of the 

 North Sea and Zuiderzee.) Akad. Prwfschr. Univ. Amsterdam 



(Leiden, 1905) 182 pp., 2 pis. 



Brehm, V.,& E.Zederbauer —Das September-Plankton des Skutari-sees. (The 

 September plankton of the Scutari lake.) Verh. It. k, Zool. Bot. Ges. Wien, 



lv. (1905) pp. 47-53. 



Bulletin des resultats acquis pendant les courses periodiques publie par le bureau du 

 Conseil (permanent international pour l'exploration de la mer) avec l'assistance 

 de M. Enudsen. (Bulletin of the results obtained during the periodic cruises, 

 published by the office of the Permanent International Committee for the ex- 

 ploration of tho sea, with the assistance of M. Knudsen.) 



Sect. D.. Plankton, Copenhagen, 1904-5. 



Oubhman, J. A. — A few Ohio Desmids. 



[A list of 20 species collected from still water near Youngstown, Ohio. One 

 new species is described, Cosmarium Amesii, and some of the other species 

 are rare in America, and new to Ohio. 



Ohio Naturalist, v. (1905) pp. 349-50. 



* Bull. Jard. Imp. Bot. St. Petersburg, v. (1905) 13 pp., 2 pis. 



