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Genas Stictodesmus Greville. 
S. craticula. (Ehr.) Whissonsett, Ormesby. 
This form was placed by Elirenberg, Kiitzing, and others, in the 
Genus Surirella ; Herr Grunow makes it the type of a new genus 
(Craticula); Professor II. L. Smith refers it (I think rightly) to, 
Greville’s Stictodesmus. 
Family X — BIDDULPHDE. 
Genus Biddulphia Gray. 
B. aurita. (Breb.) River Xene, Breydon ditches, stomachs of 
Noctilucae, Yarmouth. 
B. baileyi. (Sm.) Stomachs of Noctilucae, Yarmouth. 
B. rauiatus. (Sm.) Breydon ditches — very rare. 
B. nnoMnus. (Sm.) Breydon and Wells — very rare. 
Genus Ampiiitetras Ehrenbero. 
A. antediluvian a. Ehr. I once detected a valve of this species 
in a gathering from Cromer, but have never found it since 
in this county; it is therefore probable that it had acci- 
dentally got into this material. 
Genus Triceratium Ehrenbero. 
T. favus. Ehr. Breydon ditches, mud from Yarmouth Harbour 
— not frequent. 
T. alternans. (Bail.) Breydon ditches, stomachs of Noctilucae 
— rare. 
T. striolatum. Ehr. Breydon ditches, stomachs of Noctilucae. 
Genus Ditylum Bailey. 
D. trigonum. Bail. Stomachs of Noctilucae, Yarmouth. This form 
is Mr. Brightwell’s Triceratium undulation — T. brightwellii 
(Iialfs). Professor Bailey’s generic and specific names have 
the priority of publication. 
