MAEINE DIATOMS OF THE PHILIPPINE ISLANDS 7 



from the Philippines; the Philippine specimens of Navicula pelagi A. 

 Schmidt could be used to reproduce its figure in Schmidt's Atlas, 

 plate 7, figure 26, from Campeche Bay, so accurately does it agree 

 in line and curve and every minute detail. In Schmidt's Atlas, plate 

 2, figure 20, is an illustration of what I consider to be a very 

 doubtful example of Navicula approximata Greville, and which Grunow 

 calls var. substauroniformis. This Campeche Bay specimen is so 

 exactly like one I have from the Philippines that the word " identical " 

 is fully justified. 



When, therefore, diatom floras from two widely separated places 

 parallel each other in so many minute particulars, the fact suggests 

 that the factors determining these forms must also be strikingly alike ; 

 and problems of environmental and perhaps genetic influence are 

 conjured up that well deserve further attention. 



LIST OF CAMPECHE BAY-PHILIPPINE DIATOMS 



A. Found nowhere else 



Amphora crassa, var. campechiana Grunow in Schmidt, Atlas, pi. 28, fig. 16. 

 Auliscus caelatus, var. latecostata A. Schmidt in Schmidt, Atlas, pi. 32, figs. 



16-20. 

 Biddulphia juncatensis (Grunow) Mann in Schmidt, Atlas, pi. 76, fig. 13. 

 Campylodisciis muelleri A. Schmidt in Schmidt, Atlas, pi. 14, fig. 13. 

 Campylodiscus phalangium A. Schmidt in Schmidt, Atlas, pi. 14, figs. 11-12. 

 Campylodiscus punctulatus Grunow in Schmidt, Atlas, pi. 17, fig. 4. 

 Campylodiscus triumphans A. Schmidt, in Schmidt, Atlas, pi. 15, figs. 4-5. 

 Coscinodiscus exiguus Rattray in Schmidt, Atlas, pi. 58, fig. 30. 

 Mastogloia grundleri A. Schmidt in Schmidt, Atlas, pi. 188, fig. 26. 

 Navicula approximata, var. substauroneiformis Grunow in Schmidt, Atlas, pi. 2, 



fig. 20-21. 

 Navicula californica, var. campechiana Grunow in Schmidt, Atlas, pi. 3, fig. 19. 

 Navicula carinifera Grunow in Schmidt, Atlas, pi. 2, fig. 1. 

 Navicula coarctata Ehrenberg, var.? in Schmidt, Atlas, pi. 11, figs. 20-21. 

 Navicula for micina Grunow in Schmidt, Atlas, pi. 160, figs. 38-41. 

 Navicula intercedens A. Schmidt in Schmidt, Atlas, pi. 160, figs. 3-5. 

 Navicula lacrimans A. Schmidt in Schmidt, Atlas, pi. 12, figs. 59-60. 

 Navicula margarita A. Schmidt in Schmidt, Atlas, pi. 174, fig. 17. 

 Navicula multicostata Grunow, var. in Schmidt, Atlas, pi. 11, fig. 20. 

 Navicula pelagi A. Schmidt in Schmidt, Atlas, pi. 7, figs. 25-26. 

 Navicula probabilis A. Schmidt in Schmidt, Atlas, pi. 50, fig. 46. 

 Navicula pudens, new species, in Schmidt, Atlas, pi. 7, fig. 49 (no name). 

 Navicula serrulata Grunow in Schmidt, Atlas, pi. 7, figs. 42-43. 

 Navicula splendida Gregory, var. in Schmidt, Atlas, pi. 69, fig. 22. 

 Navicula splendida Gregory, var. in Schmidt, Atlas, pi. 69, fig. 15 (misnamed). 

 Nitzschia fluminensis, var. majuscula Grunow in Van Heurck, Synopsis, pi. 62, 



fig. 5. 

 Nitzschia weissfioggi Grunow, var. in Peragallo, Diatom. France, pi. 76, fig. 34. 

 Surirella fastuosa Ehrenberg, var. in Schmidt, Atlas, pi. 5, fig. 11. 

 Surirella fluminensis Grunow, var. in Schmidt, Atlas, pi. 4, fig. 9. 

 35035—25 2 



