CHLOROPHYCE 4 155 
sent us with a case of a spore (gametangium) 
borne not in a sporangium as in Acetabularia, but 
free on its branch. One may regard this spore, 
however, in the light of a sporangium which omits 
to form spores and itself gives rise directly to 
gametes, and this view is much strengthened by 
comparison with the case of Botryophora and 
Bornetella, where there is an actual sporangium, with 
spores of similar origin, though we do not know 
from observation what the fate of these may be. 
Dasycladus by itself appears to exhibit perpetual 
production of sexual generations, while in Accta- 
bularia it is this generation that remains unde- 
veloped, and is represented only by the spores 
(gametangia). Such interpretations, however, must 
remain purely speculative until further light is 
thrown on the matter by an examination of the life- 
history of such forms as Botryophora (so near 
Dasycladus), Neomeris, Bornetella, and Cymopolia. 
The Geographical Distribution, like that of Aceta- 
bulariec, is in tropical and subtropical seas. Dasy- 
cladus has one species occurring in the Mediterranean 
and the Canary Islands. Botryophora also has one 
species confined to the West Indian region. Neomeris 
has several species, one in the West Indies, others in 
Madagascar, the Malay Archipelago, and the tropical 
Pacific. Bornetella is Australian, and occurs also in 
the tropical Pacific. Cymopolia barbata occurs in the 
West Indies, the Canary Islands, and has been re- 
corded from Cadiz, but not from the Mediterranean, 
while C. van Bossei represents the genus in the 
Malay Archipelago. 
