Translation 2816

24
consists of dissimilar polygonal plees (panels).
Order II..Peridiniales 8a (P.155)
Division of the family . (101)
A. Transverse groove•lies near the anterior end of the cell,
so that the anterior portion of the cell is very small in
comparison with the posterior portion. 1.Amphidinium (P.101)
B. Transverse groove lies more within the middle portion of
the cell, and is circular or helical.
1. Transverse groove is circular or helical. In the latter .
case, the helical interval is less than one fifth of
the length of the body..
2. Gymnodinium (P.107)
2. Transverse groove is always helical; helical interval
is more than one fifth of the body length; the helix
turns from one to less than 34 times. 3. Gyrodinium (P.146)
C. Transverse groove lies near the posterior end of the cell, •
and is hardly helical, usually circular. Longitudinal'
groove is deVeloped only on the short posterior part of
the body
4. Massartia (P.152)
Lindemann „(in ENGLER'S Nat. Pflanzenf., 1928) assigned to
this group his "class" "KolkwitziellaIes", a concept which is
based upon the genus "Kolkwitziella". However, since this
genus cannot be maintained (it represents the encysted phase
of Diplopsalis acuta), the higher units based upon it
Kolkwitziellaceae" and "class: Kolkwitziellales"
sensu Lindemann) must also be discarded.