114 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



NAVICULA PATRICIA, new species 



Plate 24, fig. 4 



Valve of the N. erabro form, but deeply constricted at the middle, 

 the two halves ovate, tapering to the rounded ends; markings in 

 three series; an outer band of coarse rectangular divisions, obscurely 

 double-headed, widest at the center of each half, narrowing toward 

 the ends and disappearing at the constricted middle portion of the 

 valve; within this outer band and continuous with its divisions, 

 coarse and perfectly smooth bars, reaching to the third of the series 

 of markings, these last bordering the central rhaphe area; like the 

 outer band, these coarse median bars decrease in length toward the 

 apices and disappear entirely at the constricted middle area of the 

 valve; the third series of markings, running on either side of the 

 rhaphe, correspond in number to the divisions of the other two series; 

 they are coarse, rectangular, increasing regularly in size from the 

 apices of the valves toward the middle, where they replace the other 

 two series and form the only markings between the central nodule 

 and the margin; the rhaphe is massive, its inner ends very widely 

 separated, the central nodule thus left being rectangular, its longer 

 axis corresponding with that of the valve. 



Length 0.082; width 0.023; 6 lines in 0.01 mm. 



The only species at all closely resembling this is N. coarctata A. 

 Schmidt, figured in Schmidt's Atlas, plate 11, figure 30, and plate 

 174, figure 22. It is rare in the Philippine Islands. One specimen 

 has been found also at the Galapagos Islands. 



Type.— Cat. No. 43654, U.S.N.M. 



NAVICULA PELAGI A. Schmidt 



(Schmidt, Atlas, pi. 7, fig. 26.) 



Fricke's Index rec rds the above figure as a variety of N. fusca 

 (.Gregory) Ealfs, to which I do not agree. This species is" another 

 example of diatoms peculiar to Campeche Bay and the Philippine 

 Islands. 



NAVICULA PETITIANA Grunow 



(Cleve, New and Little Known Diat., pi. 3, fig. 34; Schmidt, Atlas, pi. 212, 

 figs. 26-29.) 



NAVICULA PHILIPPINARUM, new species 



Plate 25, fig. 1 



Valve broadly oval, marked by a broad marginal band of strong 

 beading set in radially directed rows, which are not closely placed 

 but separated by interspaces as wide, or som times twice as wide as 

 the rows, the beads in each row also not b?ing crowded but slightly 

 separated; short interpolated rows next to the margin not infrequent, 

 this outer band is of nearly equal width except at the middle where 



