Mr. C. l^Iereschkowaky on Cali/orni<iii Diatomn. 295 



HG. Navicula mutica. forma Cohnii, llilsc. Lost Spring 



KauL-h.', toss, y [C.] 



37. Navicula ostrearia, Turp. (.V. fusiy'ormfs, var. ostrearia)^ 



Sail Pedro, not very common. [M.] 

 1 liavo not seen the characteristic blue colour at the apices 

 of the frustule; but this i.s not a constant character, and in 

 the Hlack Sea, where this species is very common, I often 

 met with specimens showing no trace of blue colour. 



38. Navicula pennata, A. S. Northern California, not rare. 



[M-] 

 I iiave already mentioned the occurrence of this species in 

 the Glacial Ocean (Wankarema, North Siberia) *. 



39. Navicula pratexta, Ehr. [C, M.] 



1 have seen only a fragment of a valve in a sli.le containing 

 diatoms from San Pedro Bay. 



40. Navicula punctulata, ^V. Sni. Rather common in a 



laguua near San Pedro. [C, M.] 



-11. Navicula (Libellus) reticulata, Mer. San Pedro, Santa 

 Catalina Island, very common. [M-] 

 A detailed description of this species will be found in my 

 paper on the Diatoms of the Black Sea, where it is also very 

 common, as well as in the Mediterranean (Villefranche). 

 Its endochrome is very curious, the single plate forming a 

 complicated network covering the surface of bjth connecting 

 membranes with transverse bands crossing the interior ot 

 the cellule. 



42. Pinnularia cruciformis, Donk. Northern California, rare. 



4i». BrebissoniaBoeckii (Kiitz.), Grun. San Pedro, rare. [M.] 

 Length 0U07 mm., breadth of the valve 0'()21 mm., striie 

 8 in 0"0l mm. in the middle (not 10, as stated by Cleve). 



44. Frustulia interposita, Lewis. Oakland, Calif., brackish. 



Aj. Anomceoneis sculpta, var. major, < '1. Santa Rosa, 

 brackish. [C] 



Ad. Scoliotropis latestriata, CI. [C] 



47. Gomphouema kamtschaticum, var. californica, Grun. 

 .Monterey, not very rare ; San Francisco. [C, M.] 

 According to Cleve, length 0"03 mm., stria? 15 in ()*0l mm., 

 valve linear. 



• See my paper '* On PolyneMan Diatoms,'' chapter iv. 



