6 
Norman^ on Diatomacece. 
almost exclusively diatominivorous in tlie selection of its food. 
I lately examined the stomach-contents of some specimens 
which had been kept for a few weeks in a small glass tank, 
when the mass was found to consist of fully sixty per cent, 
of Diatomacese. 
These circumstances, are mentioned here merely for the 
purpose of attracting the attention of those who have the 
opportunity of studying the subject more fully. It is also 
quite possible that such investigations may tend to clear up 
the yet_, I believe/ disputed pointy as to the vegetable or 
animal nature of these beautiful organisms. 
1. Astrolampra Btella, n. sp._, Norm. (Plate II, fig. 1). — 
Valve of six rays; rays club-formed in the centre and gra- 
dually becoming linear towards the margin. Outer edge 
of disc divided into twelve punctate divisions. 
Habitat. — Sierra Leone, in a gathering kindly communi- 
cated by Mr. F. Kitton, of Norwich. 
This remarkable disc, I place, provisionally, in Astrolam- 
pra, its structure having little in common with that 
genus. The unsymmetrical appearance may be, and in all 
probability, is owing to my specimen being a double valve, for 
in the centre is seen a series of six indistinct rays, which I 
have endeavoured to give in the drawing. 
Altogether it is a remarkable form, and, probably, ought 
to constitute a new genus. 
By giving it a place in this paper, I hope to call the atten- 
tion of those who have correspondents at Sierra Leone, to 
urge them to send material from the coast in that locality. 
2. Surirella Baldjikii, n. sp.. Norm. (Fig. 2). — Valve 
panduriform, canaliculi conspicuous, widening out towards 
the margin, absent in constricted portion. Centre of valve 
a smooth cruciform space; the transverse limb being 
broader than the longitudinal one, and approaching the 
margin of the valve at its constricted part. Margin of valve 
striated ; striae 40 in •001''* 
Marine, in a deposit from Baldjik, near Varna. 
This deposit is full of beautiful and interesting forms, 
many of which are new and undescribed. The piece of 
earthy deposit I picked out of a cargo of bones discharging 
in the docks. The captain of the vessel informed me that 
the cliffs about Baldjik are wholly composed of this white- 
coloured earth. 
It will be worth while obtaining a larger supply of this 
material, which is the same that yielded the beautiful little 
form which Mr. Brightwell has described as Odontidium 
Baldjikii, 
