MARINE DIATOMS OF THE PHILIPPINE ISLANDS 105 



NAVICULA INDIGENS, new species 



Plate 23, fig. 1 



Valve elliptical, massive, cross-barred with heavy costae, which 

 are finely rugose but not beaded except near their pointed marginal 

 ends, where each bears a single large bead, the beads thus forming 

 a strong row parallel with and slightly distant from the margin of the 

 valve; a single row of similar beads running on either side of the 

 rhaphe, slightly distant from the inner ends of the costae and equal- 

 ing them in number; rhaphe heavy, straight, its ends at the center 

 distant, its apical ends not reaching the margin; a conspicuous hya- 

 line area at each apex. 



Length 0.096-0.129; width 0.037-0.068; lines 3-3.5 in 0.01 mm. 



This species belongs to the N. crabro Ehrenberg-TV. pandura 

 Brebisson group, but can not be united with either as a variety with- 

 out doing violence to any workable image of those species. It is 

 quite abundant in the Philippine Islands. 



Type.— Cat. No. 43648, U.S.N.M. 



NAVICULA INEXACT A, new name 



Plate 22, fig. 7 



This is what Cleve and Grunow name Alloioneis grundleri Cleve 

 (West Ind. Diat., p. 7, pi. 2, fig. 10), but the genus as constituted by 

 Schumann (Diat. H. Tatra, 1867, p. 73) and accepted by Cleve, is 

 too loosely defined and too uncalled for to justify its adoption. Cleve 

 himself abandons this arrangement (Nav. Diat., vol. 2, p. 51). Such 

 forms would naturally be recognized as Naviculae, and therefore to 

 call them something else is to complicate rather than simplify taxon- 

 omy. But to change this into Navicula grundleri, as is done by Cleve 

 in his Naviculoid Diatoms (vol. 2, p. 51, 1896), is to upset N. grundleri 

 A. Schmidt, in Schmidt's Atlas, plate 12, figure 35, published August 

 1, 1885. I have therefore renamed it N. inexacta, referring to the 

 broken pattern of the markings and the unsymmetrical rhaphe. 



This is another species found in both Campeche Bay and the Philip- 

 pine Islands. 



NAVICULA INGENS, new species 



Plate 22, fig. 8 



Valves broadly elliptical, closely set with beading of two kinds; in 

 the wide areas along either side, representing something over one-third 

 the width of the valve, the beading is massive, arranged in regular 

 rows, transverse, at the middle and increasingly radial toward the ends 

 of the valve, the lines and the beads so closely set that many of the 

 latter are rectangular by lateral pressure; the second kind of beading, 

 that of the narrow elliptical central area, which is less than one-third 



