94 
bulletin of the bureau of fisheries. 
mussels there were found 29 species of diatoms and 9 species of Protozoa.® The relative 
abundance of each species is indicated in the following list : 
Organisms Constituting the Food or the Mussed. 
diatom ACEA3. [Plates xx and xxi.] 
Actinoptychus undulatus Ehrenberg (fig. 12) Common. 
Amphiprora lepidoptera Cleve Very common. 
Amphora proteus Gregory (fig. 2) Frequent. 
Biddulphia favus (Ehrenberg) H. V. H. (fig. 11) Do. 
Biddulphia rhombus (Ehrenberg) W. Smith (fig. 1) Do. 
Coscinodiscus excentricus Ehrenberg (fig. 25) Do. 
Grammatophora marina Kiitzing (fig. 16) Do. 
Hyalodiscus subtilis Bailey (fig. 23) Very common. 
Melosira sculpta Kiitzing (fig. 14) Do. 
Navicula didyma Ehrenberg (fig. 6) Common. 
Navicula lyra Ehrenberg (fig. 8) Occasional. 
Navicula lanceolata Kiitzing (fig. 7) Frequent. 
Navicula splendida var. puella Ad. Schmitz (fig. 10) Occasional. 
Nitzschia sigma Grunow (fig. 15) Common. 
Nitzschia sigma var. rigida Grunow Do. 
Nitzschia sigma var. sigmatella Grunow (fig. 13) Do. 
Pleurosigma affine Grunow Frequent. 
Pleurosigma angulatum W. Smith (fig. 24) Do. 
Pleurosigma balticum W. Smith (fig. 18) Common. 
Pleurosigma decorum W. Smith (fig. 20) Do. 
Pleurosigma elongatum W Smith (fig. 19) Do. 
Pleurosigma naviculaceum Brebisson Very common. 
Rhabdonema adriaticum Kiitzing (fig. 5) Frequent. 
Rhabdonema arcuatum Kiitzing (fig. 9) Do. 
Rhizoselenia setigera Brighter (fig. 17) Very common 
Stephanopyxis appendiculata Ehrenberg (fig. 21) Occasional. 
Surirella ovalis var. ovata Brebisson (fig. 4) Common. 
Synedra gallionii Ehrenberg (fig. 22) Very common. 
Tabellaria fenestrata Kiitzing (fig. 3) Frequent. 
protozoa. [Plate xxu.] 
Ceratium fusus Ehrenberg (fig. 3) Frequent. 
Distephanus speculum Stohr (fig. 4) Common. 
Exuvisella lima Ehrenberg (fig. 5) Very common. 
Exuviaella marina Cienkowsky (fig. 1) Common. 
Glenodinium compressa Calkins (fig. 2) Do. 
Peridinium divergens Ehrenberg (fig. 6) Do. 
Prorocentrum micans Ehrenberg (fig. 7) Very common 
Tintinnopsis beroidea Stein (fig. 9) Do. 
Tintinnopsis davidoffi Daday (fig. 8) Common. 
“The identifications were made by Mr. T. E. B. Pope, assistant of the Bureau of Fisheries. 
