1897] ZYGOMYCETES, SVNCEPHALASTRUM AND SYNCEPHALIS 5 
rence of longitudinal or oblique planes of separation, as in figs. 
zand 2. In such cases the sporangium is more or less distinctly 
swollen terminally, as in fig. 2, and presents a condition which 
may well be regarded as intermediate between an ordinary spo- 
rangium and the more typical uniseriate type represented in 
Although the species of Syncephalastrum are not, as has 
been mentioned above, in any degree parasitic, and although 
there are certain important structural differences which dis- 
tinguish them from other Cephalidez, their close relationship to 
the latter can hardly be doubted. It would therefore seem 
quite safe to assume that the corresponding spore-rows in Syn- 
cephalis would prove to have an exactly similar mode of develop- 
ment. An examination of two undescribed species of this genus, 
however, shows conclusively that the processes in the two cases 
are by no means identical, and that in this instance we have a far 
more definite approach to the ordinary exogenous type of spore 
formation than is found in Syncephalastrum. 
The species of Syncephalis appear to vary very greatly in so 
far as concerns the ease with which the changes connected with 
spore formation may be observed, and the distinctness with which 
it may be followed depends, not on the size of the spores them- 
selves, but on the width of the interval which separates suc- 
cessive spores in given species. In the few common forms which 
the writer has recently had an opportunity of examining in a 
fresh condition, in connection with the preparation of the present 
note, namely S. cordata, S. depressa, S. cornu, and S. nodosa, phe- 
nomena, which in the two species just mentioned are readily 
seen, can be made out only with great difficulty. The form in 
which the true condition of things is most strikingly shown is 
an undescribed species from Liberia, which, though so closely 
allied to S. cordata that it was at first mistaken for that species, 
presents well-marked specific differences. This species, a descrip- 
tion of which is reserved for a subsequent paper, is character- 
ized by producing rather small oblong spores in somewhat elon- 
gate spore-rows, the former during their formation being sep- 
