88 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



MASTOGLOIA CEBUENSIS, new name 



Plate 19, fig. 2 



This is well illustrated in Cleve's Naviculoid Diatoms (vol. 2, p. 159, 

 pi. 11, fig. 26), but misnamed M. lemniscata Leuduger-Fortmorel. I 

 have compared it with serveral specimens of the latter, which is 

 fairly abundant in the Philippine Islands, and unless we are to admit 

 here variations wide enough to obliterate many of the accepted spe- 

 cies of this genus, including the distinctions between M. lemniscata 

 and M. leudugeri Cleve and Grove, this form can not be referred to 

 lemniscata; its general shape, its convexly bowed longitudinal ridges, 

 its tortuous rhaphe, etc., being quite distinct. Nor can it include M. 

 decora Leuduger-Fortmorel, as Cleve suggest. I have therefore put 

 Cleve's form with my own into a separate species. (See M. lemniscata 

 Leuduger-Fortmorel, Diat., Ceylan, p. 35, pi. 3, fig. 29.) 



MASTOGLOIA COCCONEIFORMIS Grunow 



(Schmidt, Atlas, pi. 188, fig. 43; Cleve, Nav. Diat., vol. 2, pi. 2, fig. 20.) 



MASTOGLOIA CRUCIATA (Leuduger-Fortmorel) A. Schmidt 



(Schmidt, Atlas, pi. 187, fig. 50; Leuduger-Fortmorel, Diat., Ceylan, pi. 2, fig. 

 19.) 



MASTOGLOIA EGREGIA A. Schmidt 



(Schmidt, Atlas, pi. 186, fig. 16.) 



MASTOGLOIA ELEGANS Lewis 



(Lewis, White Mt. Diat., pi. 2, fig. 16; Schmidt, Atlas, pi. 186, fig. 19; H. L. 

 Smith, Types, No. 212.) 



The faint longitudinal lines near to and parallel with the rhaphe, 

 which Schmidt (Atlas, pi. 186, fig. 19) seems to think are typical, are 

 not so. Specimens both with and without them were found in the 

 Philippine Islands, and those in H. L. Smith's types, made from the 

 original material, are without them. 



MASTOGLOIA FUSIFORMIS, new species 



Plate 19, fig. 3 



Valve fusiform with very acute apices; marked with beaded lines, 

 strictly transverse until near the apices, there slightly oblique out- 

 ward, reaching almost to the rhaphe, so that a barely perceptible 

 hyaline space remains on either side of it; the beads elongated and so 

 spaced in the alternate lines as to produce a brick-wall pattern; par- 

 allel to the rhaphe on either side run double lines formed by slightly 

 enlarged beads, the outer of the parallel lines slightly shorter than 

 the inner, and both flaring at the ends near to the center of the valve ; 

 the chambered loculi along the sides of the valve are unusually narrow 

 and relatively long and extend to the apices. 



Length 0.105; width 0.040; lines 10.3 in 0.01 mm.; loculi 0.0045 

 by 0.0012 mm. 



