and Species of Diatoms from the South Pacific. 41 
broadly rounded at the ends, and moderately constricted at 
the middle, with a marginal row of very minute puncta ; 
surface marked with straight longitudinal lines or folds 
(about seven); striation obscure. Length about -0038" 
(fig. 19). 
Hab.—W oodlark Island ; in a dredging communicated by 
Dr Roberts. Rare. 
In this species we find no distinct trace of supplementary 
wings, but in their place a few equidistant longitudinal lines 
or folds, which cannot be prominent as they cast very little 
shadow. 
Amphiprora? Clepsydra, n. sp.,Grev.—Front view oblong, 
rotundato-truncate at the ends, much, but not sharply con- 
stricted at the middle; strie coarse, forming a narrow intra- 
marginal band, and two inner ones still narrower, the two 
outermost following the curve of the margin, and converg- 
ing at the ends. Length :0034” (fig. 20). 
Hab.—Curteis Straits, Queensland; in a dredging com- 
municated by Dr Roberts. Very rare. | 
Here, again, we have a diatom very different indeed from 
what has been regarded as typical of Amphiprora. It will 
be perceived that the system of striation is quite unlike, the 
outer band being distinctly radiate. The inner bands may 
be regarded as supplementary wings. The constriction is 
not sharp, as in most of the preceding species, but rather 
deeply concave. 
Ampliprora ? paradoxa, n. sp., Grev.—F ront view quad- 
rangular, with truncated ends, and rounded corners very 
slightly and gradually constricted at the middle; supple- 
mentary wings broader than the primary ones, and also 
constricted opposite the nodule; striz robust, moniliform, 
10 in 001". Length :0035” (fig. 21). 
Hab.—Curteis Straits, Queensland ; in a dredging com- 
municated by Dr Roberts. 
In the. robust and distinctly moniliform strie of this 
diatom we have another deviation from the ordinary struc- 
ture of Amphiprora, so strongly marked as to render it 
evident, that although it may be convenient in the mean- 
time to refer some of these forms to that genus, a re-arrange- 
ment will soon become necessary. The possession of the 
NEW SERIES. —VOL. XVIII, NO. 1.—JULY 1863. F 
