90 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



oval area about the central nodule or alongside of the rhaphe, and in 

 the presence of a definite line bordering this rhaphe on either side 

 and continuous across the middle of the valve. But such bordering 

 lines are to be seen in other species of Scoliopleura, as S. peisonis 

 Grunow and S. schneideri (Grunow) Cleve. It will be well for dia- 

 tomists to take note of any close similarities between members of the 

 genus Navicula and the genus Mastogloia. 

 Type.— Cat. No. 43636, U.S.N.M. 



MASTOGLOIA JAVANICA Cleve 



(Cleve, Nav. Diat., vol. 2, p. 159, pi. 2, figs. 22-23; Schmidt, Atlas, pi. 188, 

 fig. 38.) 



Cleve's species agrees poorly with the above figure in Schmidt's 

 Atlas, although he seems to accept it. 



MASTOGLOIA JELINECKIANA Grunow 



(Grunow, Reise F. Novara, p. 99, pi. 1A, fig. 11; Schmidt, Atlas, pi. 187, figs. 

 39, 49; H. L. Smith, Types, No. 213.) 



MASTOGLOIA LEMNISCATA Leuduger-Fortmorel 



(Leuduger-Fortmorel, Diat., Ceyl., pi. 3, fig. 29; Schmidt, Atlas, pi. 186, 

 fig. 15.) 



MASTOGLOIA LEUDUGERI Cleve and Grove 



(Schmidt, Atlas, pi. 186, fig. 13.) 



MASTOGLOIA LINEATA Cleve and Grove 



(Le Diat., p. 59, pi. 9, fig. 11.) 



This species is very close to M. exarata Cleve (Nav. Diat., vol. 2, p. 

 156, pi. 2, fig. 35) also to M. albifrons Brun, according to Schmidt 

 in his Atlas, plate 187, figure 38. 



MASTOGLOIA OCULIFORMIS Brun 



(Schmidt, Atlas, pi. 187, fig. 39.) 



Probably only a small variety of M. jelineckiana Grunow. 



MASTOGLOIA OVATA Grunow 



Plate 19, fig. 5 

 (Cleve and Grunow, Arct. Diat., p. 17, pi. 1, fig. 2.) 



MASTOGLOIA OVUM-PASCHALE (A. Schmidt) Mann 



(Schmidt, Atlas, pi. 8, fig. 56; misnamed; Peragallo, Diat., France, pi. 5, fig. 

 13, misnamed.) 



This remarkably individual diatom was placed in Navicula by 

 Schmidt in 1885, probably because he did not have a complete frus- 

 tule and thus missed seeing the marginal rows of chambers by which 

 alone Mastogloia can be safely distinguished from Navicula. Pera- 

 gallo later called it Orthosira aspera in the above-cited reference. 



The original specimen came from Yokohama. 



