LIVERPOOL BIOLOGICAL SOCIETY. 
N. interrupta, Kutz. Mostyn, common. 
N. johnsomi, Greg. Colwyn Bay, rare. 
. itoralis, Dn. Colwyn Bay, rare. 
. lyra, Ehr. Surface of Dee, very rare. 
. marina, Greg. Colwyn Bay, common. 
. northumbrica, Dn. Colwyn Bay, rare. 
. numerosa, Dn. Hoylake, rare. 
palpebralis, Breb. Connah’s Quay, common. 
peregrina, Dn. Mostyn, common. 
pusilla, W.Sm. Connah’s Quay, common. 
. pygmea, Kutz. Mostyn, common. 
. rectangulata, Greg. Colwyn Bay, very rare. 
. rostrata, Khr. Mostyn, very rare. 
. semiplena, Greg. Connah’s Quay, rare. 
. suborbicularis, Greg. Mostyn, very rare. 
. subsalina, Dn. Helsby Marsh, common. 
. venata, Kutz. Chester cop, common. 
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. west, Greg. Queen’s Ferry, common. 
Nitzschia (Hassal) bilobata, W.Sm. Queen’s Ferry, rare. 
. birostrata, W.Sm. Mostyn, rare. 
. clostertum, W.Sm. Ince Marsh, very rare. 
. distans, Greg. Colwyn Bay, rare. 
. granulata, W.Sm. Mostyn, rare. 
. lanceolata, W.Sm. Mostyn, rare. 
. notabilis, Grun. Surface of Dee, rare. 
. obtusa, W.Sm. Helsby Marsh, rare. 
N. panduriformis, Greg. Surface of Dee, rare. 
N. paradoxa (Bacillaria paradoxa), Gmel. Surface 
of Dee, common. 
N. plana, W.Sm. Ince Marsh, very rare. 
N. punctata, Grun. Mostyn, rare. 
N. reversa, W.Sm. Helsby Marsh, rare. 
N. sigma, W.Sm. Mostyn, very common. 
N. scalaris, W.Sm. Holywell, rare. 
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