MARINE DIATOMS OF THE PHILIPPINE ISLANDS 91 



MASTOGLOIA PULCHELLA Cleve 



(Cleve, Nav. Diat,, vol. 2, p. 157, pi. 2, figs. 27-29.) 



MASTOGLOIA QUINQUECOSTATA Grunow 



Plate 19, figs. 6, 7 

 This is Grunow's species as figured and described in his Neue and 

 Ungeniigend Bekannte Algen, page 578, plate 5, figure 8, and undoubt- 

 edly includes figures 10 and 17 and probably 18 in Scjimidt's Atlas, 

 plate 186. Here too may be included M. sinuata A. Schmidt (Atlas, 

 pi. 186, fig. 11) and possibly the unnamed plate 186, figure 12; 

 because Brun's suggestion of considering the latter to represent M. 

 elongata Leuduger-Fortmorel is a very doubtful one. Leuduger-Fort- 

 morel expressly indicates in figure and description (Diat. Ceylan, p. 

 35, pi. 3, fig. 31) that his specimens are destitute of beading set in 

 transverse lines, a character hardly to be overlooked in this figure, 

 where it is fully as evident as in other species figured on the same 

 plate of Schmidt's Atlas. But Cleve, who favors this condensation 

 in his Naviculoid Diatoms (vol. 2, p. 161), seems to have been 

 obsessed by the idea that all Mastogloias having longitudinal lines on 

 both sides of the rhaphe must be grouped in M. quinquecostata Gru- 

 now, for he assembles under that name species the marginal cham- 

 bers, general outlines, and even the number and straightness of the 

 longitudinal lines of which are wholly unlike each other. Thus he 

 includes Navicula egeria Pantoesek (Hung. Diat., vol. 3, pi. 42, fig. 

 578), Mastogloia obscura Leuduger-Fortmorel (Diat., Ceylan, pi. 3, fig. 

 33), M. grunowii A. Schmidt (Atlas, pi. 186, figs. 1-7), M. Tcerguelensis 

 Castracane (Chall. Exp., pi. 15, fig. 11) M. concinna A. Schmidt 

 (Atlas, pi. 186, fig. 9), none of which properly belong here, and hints 

 that M. mauritiana Brun (Schmidt, Atlas, pi. 186, fig. 28) and M. 

 sansibarica A. Schmidt (Atlas, pi. 187, fig. 44) may also prove to be 

 this species. Doubtless M. quinquecostata Grunow shows variations; 

 but if we make it as variable as the above, consistency demands that 

 M. lemniscata Leuduger-Fortmorel, as figured by Cleve in the same 

 work and a lot of other well-known species, should be added to the 

 same heterogeneous mass. It need hardly be said that Schmidt's 

 objection to the name quinquecostata, as not truly descriptive, is a 

 worthless argument. His M. grunowii (Schmidt, Atlas, pi. 186, figs. 

 1-7) is however truly distinct from M. quinquecostata, as he and Brun 

 assert. The markings, and especially the marginal chambers, are 

 strikingly different. My specimens measure; Length, 0.070-0.099; 

 width, 0.023-0.028; lines, 14 in 0.01 mm. 



MASTOGLOIA RHOMBUS (Pelit) Cleve 



(Schmidt, Atlas, pi. 187, figs. 33-35; Le Diat., vol. 1, p. 58, pi. 9, fig. 12. See 

 Petit, Diat., Camp. Isl., p. 242, pi. 14, fig. 12.) 



This is another species found both at Campeche Bay and Philip- 

 pine Islands. 



