102 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



N. eudoxia is unwarranted. The idea advanced by Cleve (N. Diat., 

 vol. 2, p. 82) of all these forms being corroded specimens of A', gemmata 

 Greville is not worth consideration. 



NAVICULA EXCAVATA Greville, wide variety 



Plate 21, fig. 7 

 (Micro. Journ., 1866, pi. 12, fig. 15; Schmidt, Atlas, pi. 3, figs. 22-25.) 



This is another diatom common to both Campeche Bay and the 

 Philippine Islands. 



NAVICULA EXIMIA Grunow 



(Schmidt, Atlas, pi. 212, fig. 7.) 



The type specimen came from the nearby Cebu. 



NAVICULA EXPEDITA A. Schmidt 



(Schmidt, Atlas, pi. 69, fig. 6.) 



So far as I know, this species has not been found before except in 

 the fossil material from Moron, Spain. 



NAVICULA FORCIPATA Greville 



(Micro. Journ., 1859, pi. 6, figs. 10-11; Donkin, Brit. Diat., pi. 2, fig. 4; 

 Schmidt, Atlas, pi. 70, fig. 17; Nordsee Diat., pi. 2, figs. 16, 18; Van Heurck, 

 Synopsis, pi. 10, fig. 3.) 



The variety called var. densestriata in Schmidt's Atlas, plate 70, 

 figures 14-16, is one of the forms found. It is another form common 

 to both Campeche Bay and the Philippine Islands. 



NAVICULA FORMICINA Grunow 



(Schmidt, Atlas, pi. 160, figs. 38-41; Cleve, W. I. Diat., pi. 1, fig. 6.) 



Another species confined exclusively to Campeche Bay and the 

 Philippines. 



NAVICULA FUNICULATA.new species 



Plate 22, figs. 1-2 



Valve very convex, oval-lanceolate, with blunt, slightly produced 

 apices, the markings of which are not continuous with those of the 

 rest of the valve; these latter consist of strong and well-seperated 

 rows of cross-barred lines, set diagonal to the longitudinal axis of the 

 valve, approaching the rhaphe but leaving an evident median line? 

 which is slightly enlarged at the depressed central nodule into a cir" 

 cular hyaline area; rhaphe slightly bent, especially toward its outer 

 ends, which terminate in beads some distance removed from the 

 rounded apices of the valve ; in side (girdle) view each valve is seen 

 to be marked with heavy cross-barred lines above mentioned, except 

 at each end where a triangular space occurs, marked with the same 

 cross-barred lines, but running at right angles to those on the rest of the 

 valve; the whole frustule is subrectangular, with an indentation at 

 the center of each valve; the girdle is broad and hyaline. 



