508 Mr. C. Mereschkowsky on Californian Diatoms. 
149. Plagiogramma pulchellum, Grev. Californian guano. 
[Gv. ] 
150. Plagiogramma pulchellum, var. ornata, Grev. Cali- 
fornian guano. [Gv.] 
151. Plagiogramma validum, Grev. Californian guano. [Gv.] 
152. Climacosphenia pacifica, Mer. San Pedro, very common. 
[M.] 
This species has been described and figured in my paper 
“On Polynesian Diatoms.”” ‘The stypes are broad, clongated, 
and always contain in great number a small parasitic J Navicula, 
so that at first glance the frustules of Climacosphenia appear 
to be sessile and fixed on some Schyzonema. 
153. Liemophora californica, Grun. San Pedro, very com- 
mon; Catalina Island, common; Redondo Beach, com- 
mon; Monterey, rare. [G., M.] 
Endochrome composed of numerous rounded granules. 
Stypes short, structureless, with dichotomic ramification, 
colonies small. 
154, Licmophora capensis, Grun. Rather rare. [G., M.] 
A sessile form, 
155. Licmophora debilis (Kiitz.), 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 Liemophora as being a variety of 
L, Jiirgensit, 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. dubia, I prefer to regard 
it asa separate species, the more so as i Siirgensit 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 Macr ocystis, common. [M. | 
Valve rather broad, cuneate, or elongated-ovoid, slightly 
and gradually attenuated from the ‘summit to the inferior 
