and Species of Diatoms from the South Pacific. 185 
and supplementary wings conspicuously striate, the strie of 
the former having the appearance of being radiate at the 
rounded corners. The supplementary wings commence with 
a curve which, if continued, would carry them beyond the 
angle of the constriction; but it is soon arrested, and be- 
comes nearly straight, or very slightly concave, and passes 
just within the line of the nodule. ‘The central portion is 
marked with a few wide, faint, longitudinal lines. 
Amphiprora Brebissoniana, n. sp., Grev.—Front view 
broadly panduriform, truncate at the ends; wings widely 
rounded at the corners, and then rapidly inclined in a deep 
constriction; supplementary wings very narrow, widely, and 
slightly concave opposite the nodule, strize conspicuous only 
in the supplementary wings, about 22 in ‘001". Length 
0035". (Plate IV. fig. 8.) 
Not very dissimilar in general appearance to the preced- 
ing, but marked nevertheless by the shorter frustule, and 
more abrupt and straight outline of the wing between the 
rounded corner and the constriction. A closer examination 
brings out the apparent absence of strie in the primary 
wing, and considerably more numerous strie in the much 
narrower supplementary wing. ‘The central portion has a 
few faint longitudinal lines. 
Amphiprora rectangularis, nu. sp., Grev.—F ront view rec- 
tangular, the ends very slightly rounded ; wings with the 
sides nearly straight, slightly constricted; supplementary 
wings convex, overlapping the primary ones only at the 
notch-like constriction ; strie very fine. Length 0035”. 
(Plate IV. fig. 10.) 
Hab.— Woodlark Island, in a dredging communicated by 
Dr Roberts of Sydney. 
This approaches near to A. pusilla of Gregory (Z'rans. 
fioy. Soc. Hdin., vol. xxi., Pl. IV., fig. 56); but after 
examination, I am satisfied that it is distinct. It is con- 
siderably larger and more robust. The supplementary wings 
are stronger, and form a flattened curve, becoming parallel 
with the straight sides of the primary ones, and conse- 
quently only overlapping the notch which constitutes the 
constriction. 
Amphiprora? Rabenhorstiana, n. sp., Grev.—Front view 
