ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 107 



New Species of Bulbochsete.* — 0. Nordstedt describes two new 

 species of this genus. The first, from Brazil, was sterile ; but is dis- 

 tinguished from all known species by a whorl of spines in the middle 

 of each cell except the basal and all the hair-cells. The other species 

 is from Australia, where it grows attached to Characeae. It is allied 

 to B. minor, but is characterized by peculiar dwarf males. The 

 terminal cells of these dwarf males bear a bristle ; and the antheridium 

 is also sometimes divided into two branches. It constitutes therefore 

 an intermediate form between those with unbranched dwarf males 

 destitute of bristle, and the ordinary large branched, bristle-bearing 

 plants, the antheridium of which is never branched. 



"^ New Genus of Oseillariese.t — ^Under the name Borzia trilocularis 

 F. Cohn describes a new oscillarian alga exhibiting a structure 

 altogether parallel to Bacterium. It forms olive -brown masses in 

 fresh water inhabited by (Edogonium and other alg^e. It consists of 

 short oblong rods which oscillate slowly and with difficulty, each com- 

 posed of three cells filled with granular phycochrome, the two terminal 

 cells being rounded off. By cell-division the number of cells increases 

 to six, and each rod then divides into two. In the neighbourhood of 

 Breslau it shows no disposition to assume a filamentous or any other 

 condition. 



Vaucheriae of Montevideo.J — J. Arechavaleta has studied the 

 species of Vaucheria found near Montevideo, of which he gives a 

 detailed description, with diagnosis of eight new species. Some of 

 these appear, however, to be identical with well-known European 

 species ; and of others the description given is deficient in some points 

 necessary to determine whether they must be regarded as good 

 species. 



Gongrosira.§— N. Wille, who has found Gongrosira de Baryana 

 Eab., growing on Planorbis and Paludina, has proved, by cultivation, 

 that it is a form of Trentepohlia Mart. {Chroolepus Ag.). The bra- ch- 

 ing resembles at first that of Coleochcete irregularis or Trentepohlia 

 umhrina, forming a disk of cells from which the branches rise. In 

 each cell is only one nucleus ; the chlorophyll is parietal ; sometimes 

 a few drops of oil occur in the centre of the cell. The cell-wall is 

 thick and evidently laminated, and readily becomes mucilaginous. 

 Swarm-spores are formed in terminal sporangia, resembling those of 

 Trentepohlia. No conjugation was observed, nor was the further 

 development of the spores followed out. Propagation takes place by 

 single cells becoming detached from the vertical branches, and 

 developing directly into new plants. 



The organs described by Eabenhorst as oogonia the author believes 



* SB. Phytograph. Gesell. Lund., May 28, 1883. See Bot. Ceutralbl., xvi. 

 (1883) p. 95. 



t JB. Schles. Gesell. Vaterl. Cult., 1883, pp. 226-7. 



i Anal. Aten. del Uruguay, iv. (1883) p. 18 (2 pis.). See Bot. Ztg., sli. (1883) 

 p. 627. . 



§ Ofvers. K. Svensk. Vetensk. Akad. Forhandl., 1883, pp. 5-20 (1 pi.). See 

 Bot. Centralbl., xvi. (1883) p. 162. 



