Smith—Tlu Organization of the Colony. 1167 
the major axes may be either parallel ias in those shown in Text 
Figure 3, or nonparallel, as in the forms shown in Text Figure 
Figure 3. Possible combinations of the four cells of a coenobe in a parallel 
nonconcurrent coplanar series. Shaded diagrams represent those arrange¬ 
ments which are known to exist in nature. 
4. Scenedesmus Meyen may he cited as an example of the par¬ 
allel noniconcurrent coplanar forms, while certain species of 
Crucigenia, as C. rectangularis (hfaeg.) Gay should be classi- 
Figure 4. Possible combinations of the four cells of a coenobe in a nonparallel 
nonconcurrent coplanar series. Shaded diagrams represent those arrange¬ 
ments which are known to exist in nature. 
fled among the nonparallel nonconcurrenlt coplanjar forms. 
In the noncoplanar series the axes all meet at a certain point 
{concurrent colonies), or they may not ( nonconcurrent colo- 
