1894.] 



MICROSCOPICAL JOURNAL. 



79 



vember, 1873. In this process the diatoms and water are 

 poured from one vessel into another; the first vessel is 

 rinsed witli water to wash out fragments and scales, 

 then the diatoms adhering to the glass are brushed off 

 with a small clean brush and decanted, this is repeated 

 until enough are obtained comparatively clean. This 

 process will only separate certain forms, chiefly discoid; 

 although Tricerathim favus -dinX Navividu h/ra will also 

 go with them to some extent, but many .species cannot 

 be cleaned in this manner, and it will not give a just r<'p- 

 resentation of the species to be found in a deposit. 

 I find in the Shell Beach deposit: 



Actinoptychus uudulatus. E. 

 " areolatiis, E. 



Actinocyclus barkleyi. 



ehrenbergii, Ralfs. 

 " crassus, vSiu. 



'' subtilis, Cleve. 



Ainphiprora lepidoptera, Greg. 



conspicua. Orev. 

 Amphora ovalis, K. 

 Ainphitetras autediluviaua, E. 

 Auliscus caelatus, Bail. 



" inacraeauus, Grev. 

 " pruiuosus, Bail. 

 •' radiatus, Bail. (rare). 

 " sculptus, Ralfs. 

 Biddulphia aurita. Breb. 

 laevis, E. 

 " pulchella, Gray. 

 " rhombus, Sm. 

 " turgidus, E. 

 Campylodiscus echeneis, E. 

 Coccoueis scutellum, E. 

 Coscinodiscus apiculatus, E. 



" oculus iridis, E. 



gigas, E. 

 '■ radiatus, E. 



" excentricus E. 



" margiuatus, E- 



" subtilis, E. 



Cyclotella striata, Gruu. 

 Cymatopleura mariua, Lewis. 



Epithemia musculus, Kg 

 Eupodiscus argus, E. 

 Isthmia nervosa, Sm. 

 ZSIelosira areuaria, Moore, 

 borreri, Grev. 



" sculpta, E. 

 Navicula lyra, E. var. 



" didyma. Kg. 



" elliptica. Kg. 



" smithii, Breb. 



" maculata, Grev. 



" luimerosa, Breb. 



" latissima, Greg. 



" californica, Grev. 

 pra;texta, E. 



■' theta, CI. n. sp. 



" hennedyi. Sm. 

 Xitzsohia circumsuta, Crruu. 

 Plagiograiuma validum, Grev. 

 Plcurosigma affine, Gruu. 

 balticum, Sm. 

 decorum, Sm. 

 minutum, (muu 

 Pyxilla baltica, Gruu. 



" dubia. Grun. 

 Podocy.stis americaua. Bail. 

 Rhabdoneina adriaticum, K. 

 vScoliopleura tumida, Breb. 

 Stephanopyxis turris, E. 

 Surirella fastuosa, E. 



" striatula, Turpin. 



