PLANKTON OF THE WOODS HOLE REGION 
113 
Actinoptychus undulatus 
Aaterionella japonica 
Bacteriastrunl delioatulum 
Belleroch^ malleus 
Biddulphia alterans 
Biddulphla favus 
Biddulphia blddulphlana 
Biddulphia rhombus 
Corethron valdivi£fe 
Dityliua brightwelli 
Graaimatophora marina 
Grammatophora serpentina 
Guinardia flaoeida 
Leptocylindrus danicus 
Licmophora flavellata 
Licmophora lyngbyei 
nitzschia closterium 
Nitzschia paradoxa 
Nltzschia seriata 
Paralia sulcata 
Rhabdonema adriaticuni 
Skeletonema costatum 
Stephanopyxis appendiculatus 
Striatella unipunctata 
Synedra gallionii 
Synedra undulata 
Thalassiothrix longissima 
Thalassiothrix nitzschioides 
Distephanus speculum 
Dictyocha fibula 
Gerataulina bergonli 
Fig. 17.— Distribution of diatoms and Silicoflagellata in 1922 (excluding Ctiaetoceros and Rhizosolenia) 
