182 Dr Greville’s Descriptions of New Genera 
A very delicate little species, coming nearest to G. anguina 
of Kiitzing, but differing remarkably in the character of the 
undulations of the septa, as will be perceived at once by a 
reference to the figures. In G. anguina the undulations 
are equal, or nearly so throughout; while in our present 
species the lower ones are scarcely perceptible, and each 
septum near the margin resembles a sort of footstalk to the 
upper (or inner) part. I find the number of the undula- 
tions to vary, the difference not apparently depending upon 
the size of the frustule. 
AMPHORA. 
Amphora magnifica, n. sp. Grev.—Frustules large, rec- 
tangular, slightly constricted, truncate at the ends; outer 
portion only visible in the middle, where it is narrow and 
inflected ; nodule minute; dorsum with numerous longi- 
tudinal lines (about 10 in ‘001"), and brilliant scattered 
puncta. Length -0040" to -0055". (Plate IV. fig. 1.) 
Hab.—Curteis Straits, Queensland. 
The finest species of the genus. The whole surface is 
covered with numerous longitudinal lines, which have a 
plicate appearance, and are sprinkled over with luminous 
gland-like puncta. The outer portion is inflected in the 
middle for little more than a third of the length of the 
frustule. 
Amphora pulchra, n. sp. Grev.—Frustules large, con- 
stricted, somewhat panduriform, with the ends truncate ; 
outer portion very narrow, disappearing before reaching the 
rounded corners; dorsum with very numerous longitudinal 
lines, and four brilliant submarginal puncta on each side. 
Length 0040" to °0050". (Plate IV. fig. 2.) 
Hab.— Curteis Straits, Queensland. 
Evidently related to the preceding, but differing in the 
much greater constriction, in the more numerous longi- 
tudinal lines, and in the luminous puncta being limited to 
four on each side (two in each lobe, one of them being near 
the angle, and the other at no great distance from it). 
Amphora undulata, n. sp. Grev.—Frustules rectangular, 
with truncate shortly produced ends, and four sub-equal in- 
