GREVILLE, ON NEW DIATOMS. 229 
pearance of being lobed or convoluted. The puncta dis- 
tinctly radiate from the centre, until they reach the linear 
extremities, where they decussate. The extremities vary 
somewhat in breadth, and the apices are either obtuse or 
subacute. 
Rutilaria elliptica, n. sp., Grev.—F rustules elliptical, with 
a slight contraction towards the acute apices; nodule circu- 
lar, somewhat nodulose; puncta radiating, decussate at the 
ends. Length about -0040". (Fig. 3.) 
Hab. Barbadoes deposit, from Cambridge estate; C. 
Johnson, Esq., R. K. G. 
The same size as the last, but well distinguished by its 
elliptical form. 
CAMPYLODISCUS. 
Campylodiscus undulatus, n. sp., Grev.—Disc nearly cir- 
cular, with a linear, median space, and about 25 costz on 
each side, which are separated by a longitudinal furrow into 
apparently two series. Diameter about ‘0042". Coste 4 in 
7001". (Fig. 4:.) 
Hab. Bermuda, in mud brought up on the fluke of an 
anchor ; kindly communicated by George Norman, Esq. 
This species is nearly related to Campylodiscus striatus 
of Ehrenberg, figured by Mr. Brightwell in the seventh 
volume of the ‘ Journal of Microscopical Science,’ but is, at 
the same time, abundantly distinct. It is a larger and 
much finer species, with nearly double the number of costz, 
and in the character of the latter differing essentially. In C. 
striatus there are really two series on each side, the narrow 
hyaline space between them forming an actual interruption, 
while near each extremity of the median line they unite, a 
short line, at least, only passing between them. In our 
present species, on the contrary, the narrow hyaline space 
which divides the apparent two series of cost is, in 
reality, a deep furrow, round the bottom of which the costz 
are carried, as is easily seen towards each end, where, as the 
furrow becomes gradually shallow, the costz are plainly con- 
tinuous. 
GRAMMATOPHORA. 
Grammatophora Moronenis, n. sp., Grev.—Septa. straight ; 
margin very coarsely striated; striz 11 in ‘001’. Length 
0025”... :(Fig. 5.) 
Hab. Deposit at Moron, in the Spanish province of Seville. 
