: canal row in all of the cases observed was acro] 
1917] BRYAN—ARCHEGONIUM OF CATHARINEA 13 
where between the 12 and 16 neck canal cell stages; but since the 
undivided cover cell may be found as late as the 20 neck canal cell 
stage, it is evident that a variable number of initials may be cut from 
its base. We have given proof that at least 3 initials are produced, 
but we can make no positive statement as to the maximum number. 
By making due allowance for the rapid intercalary growth, we 
should estimate that in the majority of cases the number does not 
exceed 5 or 6. 
Whatever may be the number of initials, the fact remains that 
both the canal row and the peripheral cells of the neck continue 
to grow by intercalary divisions. Figs. 45-61 show some of the 
many divisions found and furnish ample proof for the statement. 
This continued intercalary growth finally produces an astonishingly _ 
large number of neck canal cells. In the material studied the 
average count is well over 50; frequent examples in the sixties were 
found; two in the seventies (one with 74 and the other with 76 
neck canal cells); and finally one example in which there were 86 
neck canal cells with several of the basal neck canal cells just 
beginning to disintegrate. Not only is the number of neck canal 
cells large, but the canal row is generally multiple in its upper part 
(fig. 65). Less often this multiplicity is found through the middle 
portion of the neck (fig. 66) and in the basal part of the canal row 
(fig. 68). We have interesting evidence from fig. 64 that this _ 
multiple condition may arise by ie simultaneous division of the 
° | ee 
cells con . 
7. stad of cross-sections through mature archegonia 
1 the * oe 
some interesting facts. A rey terminal 
Opes te Sak G tho ne 69A-F. The canal row te not - 
oS merely double i in this Portion: but generally consists of 3. cells and — 
e peculiar enlargement of the canal at its 
oe upper end is well shown by figs. 65, 60. The breaking down of the 
opetal, but did not oe 
is latter cell persists { for some: 
4 time, oe its s history up to o featon has not been followed as oa 
ium is not uniform Soe - 
