516 Mr. C. Mcreschkowsky on Califoniian Diatoms. 



201. Biddulphia aurita (Lyno;b.), Bit^b. San PeJro, rare ; 



!\I(iiiterov, common. [M.] 



202. Biddiilphia Baileyi, W. Sm. San Pedro, rare. [M.] 



203. Biddulphia Edwardsii, Febiger. Northern California, 

 common. [G., M.] 



Usually with 2-4 very robust spines. 



204. Biddulphia Isevis, var. minor. San Pedro, common ; 

 Northern California, rare. [M.] 



Diameter attaining- 0112 mm. 



205. Biddulphia longicrucis, Grev. (Diatomeentaf, zus. f. e. 

 Fr. pi. xxii. fig. 10). Calif, guano. [Gv.] 



206. Biddulphia pulchella, Gray. San Pedro, very common. 



[M.] 



207. Biddulphia reticulata. Roper. San Pedro, somewhat 

 rare. [M.] 



208. Biddulphia reticulata, var. rhombica, Mer. Northern 

 California, very rare. [M.] 



209. Biddulphia Roperiana, Grev. San Pedro, not very rare; 



Calif, guano. [Gv., M.] 



210. Biddulphia simplex, Mer., sp. n. (PI. IV. figs. 28-30.) 

 San Pedro, rare. [M.] 



Valve delicate, membranaceous, elliptic-lanceolate, with 

 ends acute, without s])ines or any visible structure. Girdle- 

 face with lateral margins straight (tig. 29) or with valves 

 being separated by only a very slight concavity (fig. 30, a, a) 

 from the connecting membrane ; processes short, acute, middle 

 part of the valve slightly convex, showing two concave 

 arcuate lines uniting in the centre. Length of the valve 

 0042 mm., breadth O'OIS mm. 



211. Biddulphia tumida, Roper. (Diatomeent. zusaram. f. e. 

 Fr. pi. xxvi. figs. 18, 19). Calif, guano. [Gv.] 



212. Biddulphia Tuomeyi, Bail. Calif, guano ; San Pedro, 

 rare. [Gv., M.] 



In San Pedro I have seen a narrow valve 0"187 mm. in 

 length and 0'042 mm. in breadth, probably belonging to a 

 variety of this species. 



213. Biddulphia (Cerataulus) turgida, W. Sm. San Pedro, 

 rare. [M.] 



214. Porpeia quadrata, Grev. (Diatomeentaf. zus. f. e, Fr. 

 pi. Ixvii. fig. 20). San Pedro, very rare. [M.] 



