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A. arcus. (Greg.) Sand gatherings Hunstanton, Wells. 
A. arenaria. (Donk.) Found with the above. 
A. grevilliana. (Greg.) Sands, Wells and Hunstanton. 
Genus Palmeria Greville. 
P. vulgare. (Kitton.)= Amphora complexa. (Gregory.) Pare 
— sands, Hunstanton and Wells. 
Family VIII — GOMPHONEMAHL 
Genus Gomphonema Agardh. 
G. GEMinatum. Ag. Pare — in the Orinesby gatherings. 
G. acuminatum. (Ehr.) Frequent — Cossey, Flordon, Orinesby, 
and all fresh-water ditches. 
G. vibrio. (Ehr.) Ormesby and Horning. 
G. olivaceum. (Ehr.) St. Faith’s, Heigham, Flordon, Whissonsett. 
Genus Havicula Bory. 
N. granulata. (Breb.) Wells, Hunstanton, and Brancaster 
sands — common. 
N. humerosa, (Breb.) Associated with the above species. 
N. rectangulata. (Greg.) Same habitats as above. 
FT. palpebralis. (Sm.) Same habitats as above. 
FT. cancellata. (Donk.) Pare — in the Wells gathering. 
FT. lyra. (Ehr.) Pare — in the Wells gathering. 
FT. retusa. (Breb.) Frequent in the Hunstanton gatherings. 
FT. fortis. (Greg.) Hunstanton, Wells. 
N. cluthensis. (Greg.) Hunstanton, Wells, Breydon. 
FT. ovalis. (Kiitz.) Breydon, Hunstanton, Brancaster. 
FT. (Pinn.) gigas. (Ehr.) Hickling broad. This form is referred 
to N. nobilis, Ehrenberg, by the author of the ‘ Synopsis of 
British Diatomaceae,’ a species not found in this county and 
probably not in Great Britain. 
P T . (Pinn.) cardinalis. (Ehr.) Very frequent and fine in the 
Hickling Broad gathering. 
FT. didyma. (Kiitz.) Copious — Hunstanton and Wells • rare in 
the Breydon ditches. 
