ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
201 
them, become smaller. Alkalies in a proportion of 0*1 to 0* 5 p.c. of 
NaOH after neutralization of the medium are favourable, and become in 
time partially neutralized. The systematic revision of the genus records 
six species of the section Eucoelastrum Wille, one being new. The 
author makes a new section, Clathrestim , in which hyaline cylindrical 
lateral prolongations occur binding the cells together, and this includes 
Eucoelastrum , together with G. Ghodatii Due. and G. reticulatum Lemm. 
Synonomy and distribution are given. The polymorphism of G.pro- 
boscideum is figured. E. S. G. 
A New Species of Coelastrum.— F. Kick (New Phytologist , 1921, 
20, 234-8, figs, in text). The species here described, G. schizodermaticum y 
was collected in a ditch on the Groby Eoad, near Leicester. The 
coenobium consists of two, four, eight or more, rounded cells, eight being 
the commonest number. The peculiarity of this organism is the splitting 
off of little cap-like structures from the free surfaces of the cells. 
Minute pads appear at first, about ^th or ^th of the circumference apart ; 
then fission of the outer layer of the cell-wall seems to occur along a line 
connecting at least two of these pads, and a little circular or four- 
cornered cap is detached. An eight-celled colony with the little caps 
well defined presents a very characteristic appearance. The small pads 
may correspond to the special short truncate processes or warts that 
unite the cells in C. Morus , G. scabrum , G. cambricum and G. reticulatum. 
The formation of auto-colonies by the cells of an entire colony has not 
been observed. Indications point, however, to a possible formation of 
daughter colonies by single cells, produced by disintegration of adult 
coenobia the daughter colony being at first enclosed within the 
mucilaginous wall of the parent cell. Fifteen different stages of the 
organism are figured. E. S. G. 
Hormiscia tetraciliata. — T. C. Frye and S. M. Zeller (Puget 
Sound Marine Station Publications , 1915, 1, 9-13, 1 pi). An account 
of a new marine species of Hormiscia which is remarkable as having 
gametes provided with four cilia instead of the normal two. A full 
description and figures of the plant are given. It is recorded from six 
stations in Puget Sound on the West Coast of America. A. G. 
Notes on the Zygnemales. — E. N. Transeau (Ohio Journ. Sci. y 
1915, 16, 17-31 ; see also Bot. Gentralbl ., 1919, 141, 279). New 
species are described of Debarga, Zygnema, and Spirogyra. E. S. G. 
New Oedogoniacese. — E. N. Transeau and H. Tiffany (Ohio 
Journ. Sci., 1919, 19, 240-2 ; see also Bot. Centralbl., 1919, 141, 279). 
Descriptions of Oedogonium hystricinum , O. pisanum var. gracilis , and 
Bulbochaete Bullardi as novelties. E. S. G. 
Two New Schizophyceae Symbioses. — V. Brehm (Naturwiss.. 
Wochenschrift , 1917, 12, 287-8 ; see also Bot. Gentralbl ., 1919, 140, 
264). As regards the much-discussed Geosiphon Wettst., and the shell- 
enclosed rhizopod Paulinella chromatophora Lauterb., it is a case 
j according to the author of secondary chlorophyll-free existence, which 
compensates for the loss of its original assimilatory contents by 
