755 
Sub-Class Alg.k. Natural Order Diatom ace.e. 
Tribe I.— llAPniDIEJ-: 
Family I. — Cymuelle.e. 
Oemis Amphora Ehrcnberg. 
A. AFFiNis. (Kiitz.) !Moutli of the Bure, ditches at Breydou. 
A. Aucua. (Oreg.) Sand-rvasliiiigs, Hunstanton, "Wells. 
A. ARENARiA. (Donk.) Same localities as the preceding. 
A. OuEviLLiANA. (Grcg.) Same localities as the preceding. 
A. Mi.NUTissiMA. (Sm.) Ormeshy Broad. 
A. ovALis. (Sm.) llethersett ; frequent in fresh-water ditches. 
A. SALiNA. Breydon. 
Genus Cocconema Ehrcnberg. 
C. cisTUL.v. 1‘lhr. Fre<|uent in most fresh-water gatherings. 
C. CYMISIFOUME. Elir. Ditches, lleigham, Wliksonsett, Flordon, 
Itorning. 
C. i.ANCEOLATUJr. Ehr. lleigham, Ormeshy : common. 
C. PAUVUM. (Sm.) Costesscy, Flordon : rare. 
C. scoTiCA. (Sm.) Costesscy : rare. 
Genus Cymrella Agardh. 
C. EiiREN'nERGH. (Kg.) IHorc or le.ss common in fresh-water 
ditches. 
C. M.VCULATA. (Kg.) Whissonsett, Flordon, Horning, llickling. 
Genus Excyoxema Kiitzing. 
E. c.KsriTOSUM. (Ralfs.) Ormeshy Broad. 
E. PROSTRATUM. (Kg.) Omieshy Broad and ditches. 
Family II. — Xavicule.e Ehrcnberg. 
Genus Mastogloia Thwaites. 
Braunii. (Grun.) Breydon. 
^r. Daxseii. Thw. Breydon. 
:\r. Smithii. Thw. Breydon. 
