68 
Greville, on New Diatoms. 
Fenestrella Barbadensis, n. sp., Grev. (Fig. 8.) 
Hab. Barbadoes deposit, from Cambridge estate, in a slide 
communicated by C. Johnson, Esq. 
The diameter of the disc is '0040' . Parallel lines lead- 
ing to the ocelli, 8 in -001". The most remarkable 
feature in the disc, composed, as it is, of a radiating cellula- 
tion, is the absence of a central point, there being neither 
umbilicus nor centre of radiation, the band above described 
lying like a bar across it. 
Craspedoporus, nov. gen., Grev. 
Frustules free, disciform ; disc divided into radiating seg- 
ments, the alternate ones dilated towards the margin, and 
bearing an intra-marginal ocellus or pseudo- opening. 
In one species of this most curious genus the structure is 
distinctly cellulate, but so irregularly as to bear no resem- 
blance in this respect to Actinoptychus (Ehr.) and its allies, 
the walls of the cellules being thin and cobwebby. In the 
other species the structure is more dense and opaque, and 
scarcely any approach to cellulation can be perceived. There 
are no septa, but the radiating segments or compartments 
are defined by an undulation, or, perhaps, a slight fold, 
the ocelliferous segments being very slightly raised above 
the plane of the intervening spaces. The ocelli or pseudo- 
openings are large and conspicuous, and appear to be concave 
or foveate, with a somewhat prominent border, especially on 
the side next the margin of the valve. In general character, 
the genus would take its place among the Coscinodisci, but 
the thickened and somewhat raised border of the ocelli 
shows more affinity with the Eupodiscece, 
Craspedoporus Ralfsianus, n. sp., Grev. — -Valve cellulate; 
ocelliferous compartments numerous, narrow and linear next 
the central space, becoming spoon-shaped towards the margin ; 
ocelli suborbicular. Diameter "0045''. (Fig. 9.) 
Hab. Barbadoes earth, from Cambridge estate ; John Balfs, 
Esq. A fragment, in a slide communicated by C. Johnson, 
Esq. 
Structure an irregular network. Central space about a 
fourth of the diameter of the disc, and somewhat more dense. 
Ocelliferous rays eight, nearly linear for half their length, 
then dilating into a spoon-like extremity, in which the 
pseudo-opening is situated near the margin. The ocelli have 
a distinct border, which is sometimes so much raised next 
the margin as to cause it to resemble a little pocket. The 
