518 I\rr. C. Mereschkowsky on Californian Diatoms. 



23'). Asteroniphahis elegans, Grev, (Diatonieentaf. pi. xxi. 

 iig. G). Calif, o-uano. [Gv.] 



236. Asteromplialus flabellatus, Grev. (Diatomeentaf. pi. xxi. 

 figs. 4, 5). Calif, guano. [Gv.] 



237. Asteromphalus heptactis (Breb.), Ralfs [Spatangidium 



BaJfVKmum). Calif, guaiio. [Gv.] 



238. Arachnoidiscus Ehrenbergii, Bail. San Pedro, rather 

 rare ; Northern California, common. [M.] 



239. Arachnoidiscus ornatiis, Ehr. San Pedro, rather com- 

 mon. [jM.] 



240. Stictodiscus calif ornicus, Grev. Calif, guano; San 

 Pedro, not rare. [Gv., M.] 



241. Actinocyclus Ehrenbergii, Ralfs. San Pedro, rare. [M.] 



242. Actinocyclus subtilis (Greg.), Ralfs. Monterey, com- 

 mon. [M.] 



243. Coscinodiscus curvatulus, Grun. Northern California, 

 not very rare. [M.] 



244. Coscinodiscus excentricus, Ehr. Northern Pacific, rather 

 rare. [A. S., M.] 



245. Coscinodiscus gigas, Ehr. San Pedro, rare; Northern 

 California, very common. [M.] 



246. Coscinodiscus lineatus, var. leptopus, Grun. San Pedro, 

 rare; Northern California, rather rare. [M.] 



247. Coscinodiscus nitidus, Greg. San Pedro, rare. [M.] 



248. Coscinodiscus nitidus, var. radiata, Mer. San Pedro, 

 rare. [M.] 



249. Coscinodiscus radiatus, Ehr. San Pedro, very common ; 



Northern California, not rare. [M.] 



250. Coscinodiscus radiatus, var. centralis (Ehr.), Rattr. San 

 Pedro, rare. [M.] 



251. Coscinodiscus radiatus, var. concinna, W. Sm. Northern 

 California, rather rare. [M.] 



252. Coscinodiscus radiatus, var. oculus iridis, Ehr. San 

 Pedro, rare ; Northern California, not rare, [M.] 



253. Coscinodiscus subtilis (Ehr.?), Grun. San Pedro, not 

 rare ; Northern California, rather common. [M.] 



