516 Howe: Phycological studies 



22. A mature sporangium with four spores ; the base of the sporangium is nearly 

 filled and closed by brown mucus. 



23. A sporangium open at apex, although the enclosed spores are still imperfectly 

 outlined. 



24. A mature sporangium with tliree spores ; a mucous plug in the base of the 

 sporangium and a collection of granules at its apex. 



25. A large sporangium containing four spores clearly outlined and three or more 

 others imperfectly formed. 



Figures 8-25 are all drawn from formalin-preserved material of our no. 4Tg4 

 (Montego Bay, Jamaica) ; 8 is magnified 12 diameters; 9-19, 24 diameters ; 20-25, 

 52 diameters. 



Plate 29. Halimeda simulans 



Photograph of a dried specimen (;;o. 4332, type — Culebra Island, Porto Rico, 

 6 Mr 1906, M.A.H.), natural size. 



Plate 30. Avrainvillca Rawsoni 



Photograph of formalin-preserved specimen in water (««?. 484J, Montego Bay, 

 Jamaica), natural size. 



