701 
(lenus Gompiionema Agardh. 
G. ACUMINATUM. (Elir.) Costcsscy, Flordon, Horning, Ormesby : 
common 
G. ACUMINATU.M var. LATiCEPS. GiTui. Osicr Car, lleigham. 
G. AUiuTU-M. (Braun.) Horning Fen. 
G. GEMiNATU.M. Ag. Omiesby, rare ; Heacham, plentiful. 
G. INSIONE t (Greg.) Osier ('ar, lleigham. 
G. OLiVACEUM. (Flir.) St. Faith’s Xeu’ton, lleigham, Flordon, 
Whissonsett. 
G. PuiGGiANA. (Grun.) Ormesby (new to Britain). 
G, Tuunis. (Ehr.) Ormesby. 
G. Yimtio. (Ehr.) St. Vaith’s Xewton, lleigham, Flordon, 
Whi.s3onsett. 
Family IV.— ACHNAXTHE.E. 
Genus Acii.vantiie.s Borg. 
A. DiiEViPES. Ag. Lynn ; a few detached frustules in a sand- 
washing, Hunstanton. 
A. UNEAnis. (Sm.) Yarmouth, Ormesby. 
A. LONGiPES. Ag. In a tide-pool, Cromer : rare. 
A. PENN.EFORMis 1 (Grcv.) Hitch, near Vauxhall Station, 
Yarmouth. 
A. sunsESsiLis. Breydon : rare. 
A. VEM'uicosA. (Ehr.) Mos.s, Osier Car, lleigham. Tlie only 
British habitat known to me. 
Genus Aciixantiiidium Kiitzing. 
A. FLPXELLUM. Breb. Ormesby, Flordon, Whissonsett, Costessey : 
rare. 
Family V. — COCCOX IDEH-. 
Genus Cocconeis Ehrenberg. 
C. PEDICULUS. Ehr. Ormesby, Flordon, Horning, V hi.ssonsett. 
C. PLACENTUL.\. Ehr. Same localities as the preceding species. 
C. SCUTELLUM. Ehr. On Zosteni marina, Y'armouth ; on Cladn- 
p/tora, Scratby ; on Pfilota plnmosa, Cromer. 
3 E 
VOL III. 
