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P. elongatum rar. fallax Grun. (Aret. Diat. pag. 50, Pl. III,
fig. 36). Transverse strice 22, oblique 20 in 0,oi mm.
P. strigosum W. Sm. rar. convexum Grun. (Aret. Diat. pag.
50). Transv. striae 20 oblique 18 in 0,oi mm.
Amphiprora (Plogiotrapis) elegans W. Sm. (Van Heurck
A. Lepidoptera Greg.
Amphiprora rimosa 0’Meara (M. J. XI, pag. 22, Pl. III, fig.
IV This curious form, found by 0’Meara in gatberings from
Seychells, ean scarcely belong to Amphiprora or to any known
genus of diatoms.
Achnanthes danica (Flögel) Grun. (Aret. Diat. pag. 21,
Stau-roneis cornuta Leuduger-Fortm. Ceyl. Pl. III, fig. 36).
Cocconeis? (Achnanthes?) producta Grun.
Plagiogramma tesselatum Grev. (M. Journ. VII, pag. 208, Pl.
X, fig. 7).
P. nankoorense Grun. (P. constrictura v. nankoorensis Grun.
Nov. pag. 95, Pl. I A., fig. 8. P. ceylanense Leuduger-Fortm.
Ceyl. pag. 52, Pl. A", fig. 59). This species cannot be a variety
of P. constrictum Grev., which lias transverse costre at the ends.
It occurs fossil in Nankoori and Monterey deposits, living near
Madagascar. Rows of puncta 7 in 0,oi mm. In a sample from
Port Jackson I have seen a small variety, only 0,o35 mm. in
length and with 12 rows of puncta in 0,oi mm., var. minuta Cl.
Raphoneis? fiuminensis Grun. (Van Heurck Syn. Pl. XXXVI.
fig. 34).
Nitzschia marina Grun. (Aret. Diat. p. 70).
N. Griindleri Grun. var. — Frustle slightly constricted in the
middle. Length 0,n. Striae, composed of elongate puncta, 13
in 0,oi mm. Carinal puncta elongate, 3 in 0,oi mm.
N. distans Greg. var. quarnerensis Grun. (Verh. 1862, pag.
580, .Fl. XVIII, fig. 6. Aret. Diat. pag. 87).
N. socialis Greg. var. seychellensis Grun. (Aret. Diat. pag.
85). Length 0,24 mm. Breadth 0,oos mm. Carinal puncta 7,
striae 16 in 0,oi mm.
N. fiuminensis Grun. (Verh. 1862, pag. 37, Pl. XVIII, fig.
35. Aret. Diat. pag 86).
N. Sigma var. valida Cl. & Grun. (Van Heurck Syn. Pl.
LXV. fig. 5), Puncta 4, str. 21 in 0,oi mm.
N. Sigma var. subrecta Grun. (Casp. Sea Alg. pag. 22).
Carinal puncta 8, striae 30 in 03oi mm.
223) Puncta 6, striae 28 in 0,oi mm.
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