2 HENRIK PRINTZ . [1920 
passed by the mother membrane, rather thick-walled and charac- 
teristic by their chromatophores. 
Thie species occurs in the samples 83, 94, 134, 167, and 168. 
Phaseolaria nov. gen. 
Cellulae ovales vel fabiformiter curvatae, acervatim consociatae, 
liberae, non inter se coalitae. Membrana cellularum tenui, glabra 
vel levissime crenulata. Ghromatophorum parietale, campanula- 
tum, omnino vel fere omnino parietem interiorem obtegit. Pyre- 
noidibus nullis. Nucleus cellulae unicus, centralis. Propagatio 
zoosporis contentu cellulae maternae succedanee diviso ortis, 
membrana materna dirupta liberis. Species duae adhuc cognitae 
algae aéris. 
Phaseolaria obliqua nov. spec. [P1. I, Fig. 52—781. 
Cellulis elongatis altera parte convexa altera minus convexa, 
recta vel concava, unde cellulae fabiformes vel reniformes, polis 
late rotundatis, oriuntur. Polo altero cellularum vulgo crassiore et 
magis rotundato quam altero angustiore et magis acuminato. Mem- 
brana tenuis et levis vel interdum leviter crenulata, incrassationibus 
non instructa. Cellulis vegetativis adultis 8—10 u, raro usque ad 12 u 
longis et %—1% angustioribus. Gellulis aetate magis provectis 
zoosporas continentibus distentis et tumefactis vulgo aliquanto 
majoribus et inflatis usque ad 16 u longis. Chromatophoro uno 
campanulato parietem interiorem totum cellulae obtegente vel raro 
uno latere incisura achroa instructo. Zoosporis stigmate distincto 
instructts. - 
The genus Phaseolaria described here, is no doubt nearly related 
to Chlorococcum FR1iks,as it is mainly the shape of the cells only 
that distinguishes these two genera, and they probably form a series 
of evolutions corresponding to GChlorella-Qocystis-Nephrocytium 
in the family of Qocystaceae. The especially distinctive feature of 
the genus Phaseolaria is that the cells are oblong, ovate-eylindrie 
of a bean- or reniform shape. One side of the cell is usually more 
tumid than the other, which may be nearly straight, at times 
even concave, whereby the cells assume å somewhat varying shape, 
bean-reniform or cylindric to nearly hemispherical, with 
broadly rnounded ends. The membrane is thin, without polar nodu- 
lar thickenings, usually glabrous, sometimes — as may also be the 
case with most of the other subaérial algae — slightly crenulate. 
The chromatophore is a single parietal slab, lining almost the whole 
of the cell-wall. Å pyrenoid is wanting. In the cells are frequently 
to be found some darker spots, which probably are products of 
metabolism, but the nature of which I have not had occassion to 
examine more closely. The nucleus is single, centrally situated. 
The asexual reproduction is done by zoospores, formed by repeated 
