MARINE DIATOMS OF THE PHILIPPINE ISLANDS 101 



NAVICULA DIDYMA Ehrenberg 



(Smith, Brit. Diat., pi. 17, fig. 154; Van Heurck, Synopsis, pi. 9, figs. 5-6; 

 H. L. Smith, Types, No. 265.) 



NAVICULA DIFFUSA A. Schmidt 



(Schmidt, Atlas, pi. 2, fig. 28.) 



Another form in both Campeche Bay and the Philippine Islands. 



NAVICULA DIPLOSTICTA Grunow 



(Schmidt, Atlas, pi. 13, figs. 25-30.) 



This is another diatom found at Campeche Bay and the Philip- 

 pine Islands. 



NAVICULA DURANDII Kitton 



Plate 21, fig. 6 



(Schmidt, Atlas, pi. 129, figs. 1-3.) 



A blotched variety is named N. bullata Norman by Castracane in 

 his Report of the Challenger Expedition, plate 28, figure 7. Another 

 interesting variety is here figured. 



NAVICULA ELONGATA Grunow 



(Schmidt, Atlas, pi. 50, figs. 27-29; Nordsee Diat., pi. 2, fig. 42.) 



It is most doubtful if this can be accepted as N. elongata of Ehren- 

 berg in his Mikrogeologie, page 77, which seems to be a nomen nudum. 

 It would be well to give this a new name. 



NAVICULA ERYTHRAEA Grunow 



(Grunow, Neu. Gek. Diat., pi. 3, fig. 17A; Schmidt, Atlas, pi. 6, fig. 22.) 



Cleve, I think unnecessarily, makes this a variety of N. cluthensis 

 Gregory (New and Little-Known Diat., p. 10.) 



NAVICULA EUDOXIA A. Schmidt, variety 



(Schmidt, Atlas, pi. 8, figs. 39-40, 45.) 



Philippine specimens seem to belong to this species as figured 

 above, especially with the unnamed figure 45, in the absence of any 

 lateral enlargement of the rectangular central area. It is also what 

 Schmidt formerly called N. mediterranea Grunow ? in Nordsee Disa- 

 tomaceen, plate 2, figure 10, which, though earlier (1874), can not be 

 preferred, as it is preempted in Kutzing's Bacillarien, plate 3, figure 

 17, (1844). Here also might be included two unnamed figures in 

 Schmidt's Atlas, plate 8, figure 28 and plate 70, figure 68; possibly 

 also what Peragallo misnames N. (Diploneis) cyntMa, var. intermedia 

 (Diat. Samoa, p. 5, pi. 1, fig. 16). Cleve (N. Diat., vol. 2, p. 82) has 

 made this species a variety of N. contigua A. Schmidt, the type figure 

 of which is in Schmidt, Atlas, plate 8, figure 43. Not only is this 

 union not advantageous, but the preference for this latter name over 



