
1267 LIVERPOOL BIOLOGICAL SOCIETY. — 
Rhizosolenia (Khr.) imbricata, Brightw. Surface of Oe 
rare. 
R. setigera, Brightw. Connah’s Quay, rare. 
R. styliforms, Brightw. Connah’s Quay, rare. 
R. wighanni, Brightw. Surface of Dee, rare. 
Schizonema (Agardh.) crucigera, W.Sm. Helsby Marsh, 
common. 
S. exumium, Th. Mostyn, rare. 
S. helnintosum, Greg. Helsby Marsh, rare. 
S. vulgare, Th. Helsby Marsh, common. 
Scoliopleura (Grun.) latistriata, Breb. Mostyn, common. 
S. tumida, Breb. Mostyn, common. 
Skeletonema (Grev.) costatwm, Grun. Surface of Dee, rare. 
Stauroneis (Khr.) acuta, W.Sm. Queen’s Ferry, very rare. 
S. salina, W.Sm. Connah’s Quay, rare. 
S. linearis, W.Sm. Helsby Marsh, common. 
Stephanopyxis (Khr.) twrris, Grev. Surface of Dee, rare. 
Striatella (Kutz.) unipunctata, Ag. Helsby Marsh, very 
rare. It was along time before I found this form, which 
is so common on the south coast. 
Survrella (Turp.) constricta, W.Sm. Burton Marsh, rare. 
S. crumena, Breb. Helsby Marsh, rare. 
S. gemma, Hhr. Mostyn, very common. 
S. fastuosa, Khr. Mostyn, rare. 
S. salina, W.Sm. Railway bridge, very common. 
S. splendida, Kutz. Helsby Marsh, rare. 
S. striatula, Turp. Mostyn, very common. 
Synedra (Khr.) affinis, Kutz. Hilbre Island, very 
common. ; 
S. affivis, var. arcus, Kutz. Helsby Marsh, very 
common. 
S. fulgens, W. Sm. Isle of Man, common. 

