ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
217 
New Genera of Algae.* — In a collection of Algae, freshwater and 
marine, from Tangier obtained by M. Schousboe, M. E. Bornet finds the 
following types of previously unpublished genera : — 
Nemoderma (Phaeosporeae). Frons horizontaliter expansa Crustacea, 
duobus stratis contexta ; inferiori horizontali piano cellulis in fila ramosa 
radiantia constituto, superiori verticali filis articulatis subsimplicibus 
apice clavatis muco laxiori cohibitis ; sporangia unilocularia, ex articulo 
intumescente fili medii formata ; plurilocularia (duplicis generis ?) sili- 
quiformia, terminalia. While agreeing with the Phaeosporeae in the 
nature of its pigment, this genus differs from all others of the order in 
its fructification. 
Halichrysis (Ehodymeniaceae). Frons carnosa, horizontalis, plana, 
andique expansa, subdichotome ramosa ; fructibus papillosis super- 
ficialibus sparsis fronde innatis prominentibus, polyspermis. 
Flahaultia (Rhodophyllidaceae). Frons plana, membranaceo-carnosa, 
rigida, varie divisa, stratis fere tribus contexta, interiore filis elongatis 
articulatis ramosis anastomosantibus, intermedio cellulis rotundato- 
oblongis laxe conjunctis superficiem versus minoribus, exteriore cellulis 
verticalibus cylindricis, submonostromaticis, cuticula firmiore tectis 
composito. Tetrasporse strato corticali immersse, sparsae, zonatim divisae. 
Cystocarpia immersa, prominentia, intra pericarpium proprium nucleum 
compositum foventia. Placenta e cellulis reticulatim anastomosantibus 
formata, lacunosa, saepius irregulariter lobata. Fila sporigena ramosa 
circum placentam radiatim disposita, fasciculata, invicem libera, sporis 
ex articulis superioribus formatis. 
Fertilization of (Edogonium.f— Dr. H. Klebahn has studied the 
phenomena connected with the coalescence of the male and female 
elements in (Edogonium Boscii. According to the author’s observations, 
the mode of division of the nucleus bears a closer resemblance to that 
which takes place in the higher plants than would be inferred from 
Strasburger’s drawings, although no distinct spindle-fibres could be 
detected. 
Differences were observable between the cell-nuclei in the vegetative, 
female, and male filaments, corresponding to differences in the cells them- 
selves. The nuclei of the vegetative cells — whether the cap-cells or 
those that lie beneath them — are relatively large (about 9 /x), granular, 
and are each provided with a distinct nucleole. The female nuclei are 
large, resembling those of the vegetative cells, but less granular, and 
are provided with a large nucleole ; the male nuclei are smaller, very 
dense and strongly granular, and are not nucleolated. 
As regards the act of impregnation, it appears to consist in a com- 
plete coalescence of the substance of the two nuclei ; no protoplasm is 
expelled from the ovum-nucleus ; the two nuclei can be clearly distin- 
guished from one another after the entrance of the male nucleus into 
the oosphere, where it increases in size, but undergoes no other change ; 
the absorption takes place after a very short period. No directing- 
spheres could be detected ; and, from the period of the first formation 
* Mem. Soc. Sci. Nat. Cherbourg, xxviii. (1892) pp. 105-376 (3 pls.) e 
f Jahrb. f. Wiss. Bot. (Pringsheira), xxiv. (1892) pp. 235-67 (1 pi.). 
1893. q 
