6 LIVERPOOL BIOLOGICAL SOCIETY. 
Dimeregramma (Ralfs) nanwm, Greg. _ Surface of Dee, 
rare. 
Epithemia (Kutz) constricta, Greg. Mostyn, common. 
E. gibba, Kutz. Helsby Marsh, common. 
E. turgida, W.Sm. Frodsham Marsh, very common. 
This genus seems to flourish equally well in fresh and 
brackish water, but is not found in the open tidal water of 
the Dee. 
Eucampia (Ehr.) zodiacus, Ehr. Surface of Dee and 
Mersey, common. 
E. striata, Stolt. Surface of Dee, rare. 
This last form was described in the Journal of the Royal 
Microscopical Society by me in 1879. It has been placed 
by Mons. H. Peragello in his ‘‘Diatomies de la Bai de 
Villefranche,”’ 1888, in the genus Rhizosolenia, because it 
has a terminal spine, which I have figured in my paper. 
I am doubtful if Mons. Peragello has ever seen my figure. 
This is the first notice I have seen of the form described in 
Europe. In Castracane’s ‘‘Challenger Diatoms”’ a single 
valve is figured, but not named. I still think that from 
the mode of growth this form is allied to Hucampia, or 
perhaps to Hemiaulus. 
Eupodiscus (Ehr.) argus, Ehr. Connah’s Quay, doubtful. 
This form is abundant in the estuary of the Thames, Kiel 
harbour, &c., but on the west side of England it is hardly 
known. 
Gomphonema (Ag.) marinum, W.Sm. Wepre Brook, rare. 
Granmatophora (Ehr.) marina, Kutz. Colwyn Bay, rare. 
G. serpentaria, Kutz. New Brighton, in Comber’s list. 
Hantzschia (Grun.) virgata, Grun. Colwyn Bay, very 
rare. - 
