DIATOMEAE. 627 



rare, and Mastogloia rimosa Cleve, which is common in one locality. Masto- 

 gloia erythraea Grun. is common but quite variable in size, outline and the 

 inequality of the loculi. Mastogloia splendida (Greg.) Cleve occurs in all 

 localities. Podocystis adriatica Kiitz. is abundant on Antithamnion. Clima- 

 cosphenia moniligera Ehrenb. is also noticeable, while Grammatophora flexuosa 

 Grun is found in all gatherings, occurring pure on Centroceras. The minute 

 form, Striatella delicatula (Kiitz.) Grun., not heretofore recorded from this 

 locality, is abundant on Polysiphonia. One specimen of Plagiogramma Idbuense 

 Cleve, a form peculiar to Borneo, although somewhat similar to Plagiogramma 

 caribaeum Cleve, has been found. 



The following list includes the greater number of the forms noticed but 

 there are probably many more as various algae appear to differ much in the 

 variety of diatoms found upon them. 



BIDDULPHIA S. F. Gray, em. Van Heurck. 

 Biddulphia Pentacrinus (Ehrenb.) Boyer. Eare. 



ANAULUS Ehrenb., em. Van Heurck. 

 Anaulus minutus Grun. Eare. 



GRAMMATOPHORA Ehrenb. 

 Grammatophora flexuosa Grun. Common. 



STRIATELLA Ag., em. Heiberg. 

 Striatella delicatula (Kiitz.) Grun. Local. 



LICMOPHORA Ag. em. Eoper. 

 Licmophora dalmatica (Kiitz.) Grun. Local. 



CLIMACOSPHENIA Ehrenb. 

 Climacosphenia moniligera Ehrenb. Common. 



PLAGIOGRAMMA Grev. 



Plagiogramma inaequale Grev. Eare. 

 Plagiogramma labuense Cleve. Eare. 

 Plagiogramma lyratum Grev. Not common. 

 Plagiogramma obesum Grev. Not common. 

 Plagiogramma pulchellum Grev. Not common. 

 Plagiogramma pygmaeum Grev. Not common. 



TRACHYSPHENIA P. Petit. 

 Trachysphenia australis P. Petit. Eare. 



CYMATOSIRA Grun. 

 Cymatosira Lorenziana Grun. Occasional. 



GLYPHODESMIS Grev. 

 Glyphodesmis eximia Grev. Eare. 



