648 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
attacks of a parasitic green monad. The filaments were bent and 
branched in a variety of ways, and the chlorophyll-bands had undergone 
more or less disintegration. The monads escaped in the form of small 
green spherical bodies, which were at first quiescent, but afterwards 
went through amoeboid movements, finally again becoming spherical aud 
quiescent. 
Irish Freshwater Algae.* * * § — Mr. W. West describes a remarkably 
rich collection of Freshwater Algae from the West of Ireland. It com- 
prises 316 species of Desmidiaceae, 128 of Diatomacese, and 144 belonging 
to other orders, besides a large number of subspecies, varieties, and 
forms. Thirty-four species are new to science, and a considerable 
number of others have not previously been observed in Britain. 
Dermatomeris, a new genus of TJlvaceae.f — Herr P. F. Reinsch 
describes a collection of fresh-water algae from S. Georgia, obtained 
in the German Polar Expedition. Among them are several new species 
of Sorastrum , Coelastrum , Prasiola , Cosmarium , Ulothrix, Phizoclonium , 
Vaucheria , &c., and a new genus of Ulvaceac, Dermatomeris , nearly 
allied to Schizomeris , with the following diagnosis: — Thallus foliaceo- 
membranaceus, substantia coriaceo-gelatinosa, basi angustata callosa 
insidens. Cellulee f'rondis dilatatae rotundatae et subangulosae, spatiis 
latioribus hyalinis disjunctae, in octades dispositae (in sectione tballi in 
tetrades et thalli horizontaliter visae in tetrades dispositae), in sectione 
thalli quadri-seriatae. Cellulae basis angustatae dilatatae in familias 
octo-cellulares usque 12-cellulares, globulosas, absque ordine dispositas 
dispositae. Several species of Chytridiaceae and Saprolegniaceae were 
also observed endophytic in cells of Cosmarium and Staurastrum. 
Zoogametes of Enteromorpha4 — Mr. R. J. Harvey Gibson describes 
the mode of escape and conjugation of the zoogametes of Enteromorpha 
compressa. They always escape singly through an aperture in the wall 
of the gametange. The conjugation always commences with the fusion 
of the pointed ends, and the process appears to take over an hour. In 
no case were gametes from the same cell seen to conjugate. 
Cymopolia, Neomeris, and Bornetella.§— Graf zu Solms-Laubach 
confirms most of Cramer’s observations on the two latter of these genera 
of Dasycladacere. In the single large spore which fills up the sporange 
of Neomeris annulata he states that the basal end exhibits a flat circular 
furrow by which a slightly projecting calotte is separated, corresponding 
to the cap in the spore of Acetabularia. The mode of development of 
Neomeris corresponds, in all probability, to that of Acetabularia ; gametes 
are formed from the contents of the spore after the sporange has 
become freed from its calcareous incrustation ; these gametes no doubt 
conjugate, and the zygote gives birth at first to a simple unbranched 
filament. The structure of Cymopolia barbata indicates also that the 
same processes take place there also. The sporange puts out two green 
protuberances with blunt ends, but the gametange appears to be some- 
* Journ. Linn. Soc. (Bot.), xxix. (1892) pp. 103-216 (7 pis.). 
t Sep. Abdr. aus Ergebn. d. Deutsch. Polar-Expeditionen, ii., 37 pp. and 4 pis. 
t Journ. of Bot., xxx. (1892) pp. 103-4. 
§ Ann. Jard. Bot. Buitenzorg, xi. (1892) pp. 61-97 (3 pis.). Cf. this Journal, 
1891, p. 75. 
