MARINE DIATOMS OF THE PHILIPPINE ISLANDS 97 



This diatom is nearest to the original type form of N. pandurq 

 Brebisson, as figured in his Diatomees de Cherbourg, plate 1, figure 

 4, and in Schmidt's Atlas, plate 1 1 , figure 4 ; but its peculiarly rounded 

 contour, wavy costal bars, etc., make its specific distinctness much 

 more evident to the eye than any verbal description could indicate. 



Type.— Cat. No. 43640. U.S.N.M. 



NAVICULA BRASILIENSIS Grunow 



(Schmidt, Atlas, pi. 6, figs. 19-21; pi. 23, fig. 25,; pi. 31, fig. 33.) 



NAVICULA BULLATA Norman 



(Micro. Journ., 1861, pi. 2, fig. 7; Schmidt, Atlas, pi. 3, figs. 8-9.) 

 Its value as a separate species solely because of the blotches in the 

 lyrate hyaline area is very questionable, these blotches being variable 

 in character and number and not infrequent in other species. 



NAVICULA CAECA, new species 



Plate 21, fig. 3 



Valve long, narrow, constricted at the middle, gently curving out- 

 ward to slightly less than one-half the distance to the apices, then 

 narrowing to the rounded apices; crossed by very fine, closely set 

 obscurely moniliform lines, which are strictly transverse except close 

 to the apices, where they are barely diagonal; median hyaline area 

 hardly perceptible, except for a slight oval unsymmetrical space at 

 the center; rhaphe strong, hooked at the apices, very slightly bent 

 to one side at the center. 



Length, 0.0732; width, 0.0162; lines, 22 in 0.01 mm. 



This is essentially the unnamed species in Schmidt's Atlas, plate 

 50, figure 34, which came from King Mill Island. My specimen is 

 somewhat narrower and the bend of the rhaphe ends at the center is 

 less pronounced. The gentle curves of this specimen give to it a 

 very graceful outline. Rare. 



Type.— Cat. No. 43641; U.S.N.M. 



NAVICULA CALIFORNICA Greville 



(Greville, Cal. Guano, p. 29, pi. 4, fig. 5; Schmidt, Atlas, pi. 3, figs. 6, 15-16, 19.) 



Although all the above may be considered to be varieties of N. 

 hennedyi the type form is far from close. Variety campechiana is 

 another diatom common both to Campeche Bay and the Philippine 

 Islands. 



NAVICULA CAMPYLODISCUS Grunow 



(Schmidt, Atlas, pi. 8 figs. 9-10, 12; pi. 70, figs. 64, 65.) 

 This species is another form common to both Campeche Bay and 

 the Philippine Islands. 



NAVICULA CARIBAEA Cleve 



(Schmidt. Atlas, pi. 2, fig. 17; pi. 6, figs. 10-12; pi. 70, fig. 48.) 



