40 Dr Greville’s Descriptions of New Genera 
doubtfully to the present genus. In some respects it is not 
unlike a gigantic Amphora ; but the position of the nodules, 
and the apparent existence of what I have called supple- 
mentary wings, are opposed to its being referred to that 
genus. ‘There are, however, some very aberrant forms dis- 
covered by my friend the late Professor Gregory, and several 
more recently observed by myself, which render the generic 
discrimination of Amphiprora, in the absence of the valvular 
view, somewhat difficult. The panduriform outline in some 
instances disappears altogether, the constriction is occa- 
sionally scarcely perceptible, and the wing inconspicuous. 
The striz in the present diatom are transverse, 27 in ‘001’, 
and sufficiently evident. 
Amphiprora nitida, n. sp., Grev.—Small; front view 
panduriform, broadly rotundato-truncate at the ends, rather 
deeply and sharply constricted, margin with a row of 
minute puncta; supplementary wings linear, forming a 
nearly straight line, which passes within the constriction ; 
another ridge-like line converging towards the middle at 
each end. Striz conspicuous. Length from ‘0020" to :0035” 
(fig. 18). 
Hab.—Curteis Straits, Queensland; in a dredging com- 
municated by Dr Roberts. 
A beautiful and apparently very distinct small species, 
characterised at once by the lines of the supplementary 
wings and the superficial ridges. The supplementary wing 
is linear, passing on each side from end to end in a very 
slight curve just within the nodules. At the ends it turns 
almost at a right angle to join the middle portion, and thus 
a sort of parallelogram is produced, which, when focussed 
for itself, is very striking. Another very characteristic line 
seems to be caused by an elevated ridge, commencing on 
each side at the angle of the middle portion or connecting 
zone, curves outwards until it reaches the margin of the 
supplementary wing, which it then follows for about a third 
of its length, when it leaves it and curves in a similar way 
towards the middle portion at the opposite end. The surface 
is thus much undulated, as is shown by the different direc- 
tions taken by the striz. 
Amphiprora lineata, n. sp., Grev.—Front view oblong, 
FiMias <. y oe 
Wee. : 
