516 Howe: PHYCOLOGICAL STUDIES 
. A mature sania with four spores; the base of the sporangium is nearly 
élled = closed by brown mucus. 
23. A sporangium open at apex, although the enclosed spores are still imperfectly 
outlined. 
24. A mature sporangium with three ay a mucous plug in the base of the 
sporangium and a collection of granules at its 
25. A large sporangium containing four spores ‘clone outlined and three or more 
others EES formed. 
igures 8-25 are all drawn from formalin- -preserved material of our 0. 4794 
(Montego Bay, seer) ¢: 8 is magnified 12 diameters; 9-19, 24 diameters ; 20-25, 
52 diameters, 
PLATE 29. Halimeda simulans 
Photograph of a dried cprnisg ("o. 4332, type —Culebra Island, Porto Rico, 
6 Mr 1906, M.A.H. ), natural siz 
PLATE 30. Avrainvillea Rawsoni 
Photograph of Nie, te adits specimen in water (no. 4843, Montego Bay, 
Jamaica), natural size 
