1894.] 



MICROSCOPICAL JOURNAL. 



79 



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

 poured from one vessel into another; the first vessel is 

 rinsed with water to wash out fragments and scales, 

 then the diatoms adhering to the glass are l)rushed 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 Triceratium fav?is and Navicula lyra will also 

 go with them to some extent, but many .species cannof 

 be cleaned in this n'lanner, and it will not give a just rep- 

 resentation of the species to be found in a deposit. 

 I find in the Shell Beach deposit: 



Actinoptyclius undulatus, E. 

 " areolatus, E. 



Actinocyclus barklejn. 



" ehrenbeigii, Ralfs. 



" crassus, Sm. 



" subtilis, Cleve. 



Amphiprora lepidoptera, Greg. 



" conspicua, Grev. 

 Amphora ovalis, K. 

 Amphitetras antediluviaua, E. 

 Auliscus caelatus. Bail. 



" macraeauus, Grev. 

 " pruinosus, Bail. 

 ■' radiatus, Bail. (rare). 

 " sculptus, Ralfs.. 

 Biddulphia atirita, Breb. 

 laevis, E. 

 " pulchella, Gray. 

 " rhombus, Sm. 

 " turgidus, E. 

 Campylodiscus echeneis, E. 

 Coccoueis scutellum, E. 

 Cosciuodiscus apiculatus, E. 



" oculus iridis, E. 



" gigas, E. 



" radiatus, E- 



" excentricus E. 



" marginatus, E. 



" subtilis, E. 



Cyclotella striata, Grun. 

 Cymatopleura iiiariua, Lewis. 



Epithemia musculus. Kg 

 Eupodiscus argus, E. 

 Isthmia nervosa, Sm. 

 ISIelosira arenaria, Moore. 



" borreri, Grev. 



" sculpta, E. 

 Navicula lyra, E. var. 



" didyma, Kg. 



" elliptica, Kg. 



" smithii. Breb. 



" maculata, Grev. 



" humerosa, Breb. 



" latissima, Greg. 



" californica, Grev. 

 pr^etexta, E. 



" theta, CI. n. sp. 



" henaedyi, Sm. 

 Nitzschia circumsuta, Gruu. 

 Plagiogramma validum, Grev. 

 Pleurosigma affine, Gruu. 

 " balticum, Sm. 



" decorum, vSui. 



" minutura, Gruu 



Pyxilla baltica. Grun. 



" dubia. Grun. 

 Podocystis americana. Bail. 

 Rhabdonema adriaticum, K. 

 Scoliopleura tumida, Breb. 

 Stephanopyxis turris, E. 

 Surirella fastuosa, E. 



" striatula, Turpin. 



