50S Mr. C Meresclikowsky 07i Califorman Diatoms. 



149. Plagiogramma piilchellum, Giev. Californian guano. 



[Gv.] 



150. Plagiogramma pulchellum, vav. ornata, Grev. Cali- 

 fornian guano. [Gv.] 



151. Plagiogramma validum, Grev. Californian guano. [Gv.] 



152. Climacospheniapacifica, Mer. San Pedro, very common. 

 [M.] 



This species has been described and figured in my paper 

 " On Polynesian Diatoms." The stypes are broad, elongated, 

 and always contain in great number a small parasitic Navicula, 

 so that at first glance the frustules of Climacosphenia appear 

 to be sessile and fixed on some Scliyzonema. 



153. Licmophora californica, Grun. San Pedro, very com- 

 mon ; Catalina Island, common ; Redondo Beach^ com- 

 mon ; Monterey, rare. [G., M.] 



Endoclirome composed of numerous rounded granules. 

 Stypes short, structureless, witii dichotomic ramification, 

 colonies snudl. 



154. Licmophora capensis, Grun. Rather rare. [G., M.] 

 A sessile form. 



155. Licmophora debilis (Kiifz.), Grun. San Pedro, com- 

 mon ; Catalina Island, very common on Macrocystis. 

 [M.] 



156. Licmophora dubia, Grun. San Pedro, very common; 

 Catalina Island, rare ; Monterey, rare. [M.] 



Grunow considers this Licmophora as being a variety of 

 L. Jiirgensitj from which it differs by the strictly superficial 

 septa, with septal puncta disposed on the extreme upper 

 margin of the frustule. This characteristic, as well as a few 

 others, being very constant in L. duhia, I prefer to regard 

 it as a separate species, the more so as L. Jiirgensn does not 

 occur in the Pacific Ocean, while L. dubia is very common. 

 This species seems to be a widely distributed one, reaching 

 even the Indian Ocean (Sumatra). 



In California the frustules are always sessile, while in the 

 Black Sea they are fixed on somewhat elongated structureless 

 stypes. 



157. Licmophora dubia, var. latior, Mer. (PI. V. figs. 10, 11.) 

 Catalina Island, on Macrocystis, common. [M.] 



Valve rather broad, cuncate, or elongated-ovoid, slightly 

 and gradually attenuated from the summit to the inferior 



