MARINE DIATOMS OE THE PHILIPPINE ISLANDS 17 



band, crossbarred, with the but slightly curved rhaphe as its upper 

 outline; the two lunate spaces between the rim of the bicurved dorsal 

 side and the broad straight band of the ventral side show faint traces 

 of lines connecting the single row of beads of the former with the 

 crossbars of the latter; the terminal beads of the rhaphe large and at 

 the extreme tips of the valves; central nodule broad but obscure. 



Length 0.117, width 0.019 mm. 



This delicate species resembles in form, but not in markings, 

 A. paludosa W. Smith, typical specimens of which also occur in 

 the Philippine Islands. 



Type.— Cat. No. 43567, U.S.N.M. 



AMPHIPRORA O'SWALDII Janisch 



Plate 3, fig. 2 



(Janisch, Ga/. Exp., pi. 20, figs. 22-24.) 



Although there is considerable resemblance between this and the 

 doubtful example of NitzscMa which Cleve calls N. ocellata (New and 

 Little-Known Diatoms, pi. 4, fig. 47), I take this at least to be a true 

 AmiMprora, one of my specimens showing the complex and inter- 

 laced girdle of this genus. 



AMPHIPRORA PALUDOSA W. Smith, var.? 



(Smith, Brit. Diat., pi. 31, fig. 269; Van Heurck, Synopsis, pi. 22, fig. 10.) 

 This diatom in the Philippines varies considerably from its type. 

 In fact, were we to judge from Smith's description on page 44 of the 

 above reference, and especially by the figure there given, which is by 

 the generally accurate artist, Tuffen West, we should be justified in 

 calling the Philippine form a new species. But when we compare 

 with more recent illustrations, such as the one given above by Van 

 Heurck, it is safer to consider the specimen as a variety of Smith's 

 diatom. My specimen measures length 0.169 mm., with 4.5 lines in 

 0.01 mm., measured midway on the dorsal curves. 



AMPHIPRORA PELAG1CA Brun 



(Brun, Espec. Nouv., pi. 23, figs. 3-4.) 



AMPHIPRORA PLICATA Gregory 



(Gregory, Diat., Clyde, pi. 12, fig. 57.) 



AMPHIPRORA TEMPEREI Cleve 



(Le Diat., vol. 1, pi. 2, fig. 3.) 



Genus AMPHORA Ehrenberg 



AMPHORA ALATA Peragallo 



(Peragallo, Diat., France, pi. 43, figs. 4-5; Schmdit, Atlas, pi. 26, figs. 60-61, 

 no name.) 



