130 Hazen: NEW SPECIES OF LOBOMONAS 
typical obpyriform and lobed shape, and sometimes even show 
the protoplast somewhat separated from the new cell wall, before 
escaping from the mother cell. The escape appears to be accom- 
plished by a gradual softening and disintegration of the wall of the 
mother cell, rather than by rupture at a single point (FIG. 40). 
The eight daughter cells of this figure are so small as to occasion 
the surmise that they might be gametes, but conjugation was 
not seen in this species. 
The chief characteristics distinguishing this species from 
L. Francei Dang. are: the general obpyriform shape, the well 
developed anterior beak or papilla, the lateral pyrenoid, and the 
persistence of the form of the mother cell as division. The 
description may be summarized as follows 
Lobomonas rostrata sp. nov. L. caltulis vepeintves plus 
minusve obpiriformibus, rarius Secor. membran cellulae 
cta, per quo 
longitudine corpus scilie sia sitin vel longiora, vel bre- 
viora: proto plasto primum membranae verrucas complente, 
deinde plus minus contracto et ellipsoideo: Boia top nak valde 
excavato, pyrenoidem unum lateralem portante: stigmate bacil- 
nunc 
contractilibus binis juxta papillam anteriorem suppositis. 
esopoentto | fit protoplasto cellulae vegetativae jam immobilis 
diviso in 4 a zoosporas, quae formam typicam priusquam 
evaderunt ex seme matricalis membrana adipiscuntur. 
Copulatio haud hier 
ongit, cell. veg. Sra i: lat. 4-8 u.; long. ciliorum Ca. 5-14 u. 
Hab. in aqua pluviali quae colligitur in viis terrenis, et in 
lacuna quadem lutulenta in pascuo pecuario. Englewood, New 
Jersey, Sept—Nov. 1919, Sept. 1920:Shelburne, Vermont, 3 
Aug. 1921 
It has been already pointed out elsewhere (6) that Lobomonas 
is to be regarded as a special offshoot from Chlamydomonas, 
not leading to any higher group so far as we know at present. 
It might be thought simple to derive the genus directly from 
the Polyblepharidaceae, even from the genus Dunaliella, which 
clearly appears to be the immediate ancestor of Chlamydomonas, 
since it has all the features of cell organization of the latter 
genus except for the lack of a firm cell wall. When, however, 
it is recalled that the gametes of Lobomonas, reported above for 
the first time, possess cell walls, it will be more natural to look for 
