Genus Triceratium Elirenberg. 
T. ALTERXAN8. (Bail.) Stomaclis of i\Toc/<7«c« ^ amiouth, 
Hun.stanton Sands ; rare. 
T. 1 Biddulpiiia. Heiberg. Mud from Breydou and \annouth 
Harbour : rare. 
T. FAVUS. Ehr. Breydon and Yariuoutb mud. 
Genus Ampiiitetras Ebrenberg. 
A. AN’TEDiLUViANA. (Ehr.) I liavo only found a few specimens on 
Sea-weed from Cromer. 
Genus Litiiodesmium Ebrenberg. 
L. ? MALEEUS. (Bri.) Stomachs of AW /7 mc« Yarmouth. 
1 place this form in the above genus with considerable 
hesitation. ^Ir. Brightwcll refers it to Iriceratium, to 
which it seems to have less aiUnity. It is probably not a 
Diatom. 
Family XII. — EUPODISCE^E. 
Genus Eupomscus Ebrenberg. 
E. ARGUS. Ehr. Mud from Yarmouth Harbour : rare. 
Genus Auliscus Ebrenberg. 
A. SCULPTUS. (Sin.) Mud from \armouth Harbour: rare. 
Family X III.— HELIOPELTE.E. 
Genus Actixoptychus Ebrenberg. 
A. SPLEXDEXS. (Koper.) Yarmouth Harbour mud : rare. 
A. uxuuEATUS. (Kg.) Stomachs of Nodihica miliuris, abundant. 
Yarmouth, Breydon, HunsUvnton. 
Family XIV. — ASTEROLAMPBE.E. 
Xot represented. 
H. RADI AT ua 
Family COSCIXODISCErE. 
Genus Hyalodiscus Ebrenberg. 
Breydon, Hunstanton, Yarmouth. 
