PLANKTON OF THE WOODS HOLE REGION 
Actinoptychus undulatus 
Asterionella japonica 
Bacteriastrum delicatulum 
Belleroché& malleus 
Biddulphia alterans 
Biddulphia favus 
Biddulphia biddulphiana, 
Biddulphia rhombus 
Corethron valdivide 
Ditylium brightwelli 
Grammatophora marina 
Grammatophora serpentina 
Guinardia flaccida 
Leptocylindrus danicus 
Licmophora flavellata 
Licmophora lyngbyei 
Nitzschia closterium 
Nitzschia paradoxa 
Nitzschia seriata 
Paralia sulcata 
Rhabdonema adriaticum 
Skeletonema costatum 
Stephanopyxis appendiculatus 
‘Striatella unipunctate 
Synedra gallionii 
Synedra undulata 
Thalassiothrix Jongissima 
Thalassiothrix nitzschioides 
Distephanus speculum 
Dictyocha fibula 
Cerataulina bergonii 
Fie. 17.—Distribution of diatoms and Silicoflagellata in 1922 (excluding Cheetoceros and Rhizosolenia) 
Je 
JUL 
Auge 
Sepe 
Octe 
NoVe 
Dece 
113 
