and Species of Diatoms from the South Pacific. 39 
with the corners very widely rounded, rather deeply and 
acutely constricted ; supplementary wing narrow, con- 
vex, not reaching the constriction; central portion with 
faint lines or folds. Length about ‘0040’, breadth -0028” 
(fig. 14). 
Hab.—Curteis Straits, Queensland; in a dredging com- 
municated by Dr Roberts. 
It was not until I had seen a number of examples of this 
diatom that I began to regard it with any confidence. 
There can be no doubt that some of the Amphiprore are 
liable to considerable variation ; and the very broad, squat 
appearance of the frustules now before me made me suspect 
that they might turn out to be a variety of some large 
species. All the specimens, however, present precisely the 
same characters, and I am consequently prepared to offer it 
asa genuine species. From 4. maxima of Gregory it differs 
not only in form, and in the much narrower supplementary 
wings, but very strikingly in the more truncated ends. 
The striz are readily brought out. 
Amphiprora delicatula, n. sp., Grev.— Minute, hyaline ; 
front view oblong, with rotundato-truncate ends and deep 
lateral constriction; supplementary wing very narrow, 
slightly overlapping the nodule; lateral view lanceolate, 
the apices. slightly produced and minutely truncate. Length 
about °0025" (figs. 15, 16). 
Hab.—Woodlark Island ; in a dredging communicated by 
Dr Roberts. Not uncommon. 
A most delicate and graceful species, easily overlooked 
on account of its small size and hyaline character. I have 
been unable to make out the strie. 
Amphiprora? superba, u. sp., Grev.—Very large; front 
view elongated oblong, slightly constricted, widest part . 
about half way between the ends and middle, each extremity 
gradually converging to the angle of the connecting zone, 
which is truncate ; supplementary wings rather broad, linear, 
directed inwards with two longitudinal lines between them 
andthe margin. Length -0108" (fig. 17). 
Hab.—New Caledonia; in a dredging communicated by 
Dr Roberts. Extremely rare. 
This fine diatom may perhaps be regarded as belonging 
