MARINE DIATOMS OF THE PHILIPPINE ISLANDS 73 



preserve the right-angle crossing of the two sets of lines; rhaphe 

 practically straight and having a distinct oblique spine at each 

 outer end. 



Length, 0.039; width, 0.023; lines, 9.5 transverse and 10 vertical in 

 0.01 mm. 



Type.— Cat. No. 43618, U.S.N.M. 



CYMATONEIS SULCATA (Greville) Cieve 



(Cleve, Nav. Diat., vol. 1, p. 75, pi. 1, figs. 12-13; Schmidt, Atlas, pi. 212, figs. 



41-45.) 



This is another species found at both Campeche Bay and the 

 Philippine Islands. 



Genus CYMBELLA Agardh 



CYMBELLA EHRENBERGII Kiitzing 



(Schmidt, Atlas, pi. 9, figs. 6-9, 16-18; Van Heurck, Synopsis, pi. 2, figs. 

 1-2.) 



CYMBELLA GASTROIDESJKiitzing 



(Schmidt, Atlas, pi. 9, figs. 1-2; Van Heurck, Synopsis, pi. 2, fig. 8; H. L. 

 Smith, Types, No. 118.) 



Genus DIMEREGRAMMA Ralfs 



DIMEREGRAMMA BILINEATUM (Cleve and Grunow) Mann 



Plate 15, fig. 4 



(Cleve, Vega Diat., p. 499, pi. 37, fig. 55.) 



The doubt of this being a Rhaphoneis expressed by the authors, is 

 well founded. A careful study convinces me it is better classified in 

 the present genus. A form found in the Philippine Islands is either 

 a very dissimilar variety from those figured by Cleve, or preferably 

 should be made into a separate species. In this case it may be 

 called — 



DIMEREGRAMMA FLUENS, new species 



Plate 15, fig. 5 



Valve nearly rod shaped, but gracefully undulate by being broadly 

 constricted at the middle and tapering gently to the rounded ends ; 

 a double row of course rectangular beads on either side next to the 

 margin until near the ends they become single rows, each bead marked 

 with one or two dots; central area narrow, tapering, not constricted; 

 apices slightly elevated, massive, hyaline. 



Length 0.105; width 0.012; 7 lines in 0.01 mm. 



Type.— Cat, No. 43619, U.S.N.M. 



DIMEREGRAMMA INFLATUM Mann 



(Mann, Diat., Alb. Voyages, p. 327, pi. 44, fig. 6.) 



For a discussion of the relationship of this to Gregory's Denticula 

 marina, see the above reference. 



