1922} DUPLER—REBOULIA 147 
among which are Sphaerocarpus and Geothallus (CAMPBELL 1), 
Aneura (LEITGEB 14, CLAPP 5), Fossombronia (HUMPHREY 12), 
Pellia (Kren1tz-GERLOFF 13), and Symphyogyna (McCorMIcK 15), 
and is in contrast with forms in which the first wall is more or less 
oblique, as occurs in Riccia (Kienitz-GERLOFF 13, CAMPBELL 1, 
GARBER 8), Marchantia (DURAND 7), and Preissia (KieNITzZ- 
GERLOFF 13). 
HOFMEISTER thought the Reboulia egg divided first by a strongly 
inclined wall. Lrrrces claimed the first wall to be generally 
oblique, occasionally perpendicular, to the long axis. Haupt (10) 
states that the first division is ‘always accompanied by a transverse 
wall.”’ WoopBuRN’s statement is not so positive, and one of his 
figures shows the first wall slightly inclined. The writer found 
several cases in which the first wall was more or less oblique, some- 
times with the epibasal cell the larger of the two (fig. 6). 
FILAMENTOUS EMBRYO.—The published accounts differ consider- 
ably as to the behavior following the first division. HoFMEISTER de- 
scribed the growth as due to an apical cell with two cutting faces, the 
epibasal cell dividing repeatedly by alternately inclined walls, result- 
ing in a slender embryo of two rows of cells. K1ENITZ-GERLOFF 
not convinced by HoFMEISTER’S account, but concluded from oe 
ogy with Grimaldia that in Reboulia an octant is formed by vertical 
walls perpendicular to the first transverse wall. Lrrrcrs claimed 
quadrant formation by walls perpendicular to the first, the apical 
and basal cells of the quadrant being the larger, since the first wall 
is usually oblique, and both the epibasal and hypobasal cells are 
divided unequally. Cavers (3) also claimed an octant by the for- 
mation of perpendicular walls, and regarded the epibasal half of the 
octant as giving rise to the capsule, the hypobasal to the foot and 
stalk. The studies by WoopBuRN, Haupt, and the writer do not 
agree with these earlier statements. In most cases the second and 
third divisions are parallel to the first, resulting in a filament of four 
cells, with the walls between them more or less parallel to one 
another. 
Woopsurn and Haupt both claim the second division to be in 
the epibasal cell, resulting in a row of three cells. 'WooDBURN says 
the third division may be in either the apical or the middle of these _ 
