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published by Greville I cannot be sure of the identity. The
valve was 0,072 mm. in length and 0,oo5 mm. in breadth. Striae
13 1 2 in 0,oi mm. — Pl. 35, fig. 2.
Ampliora ostrearia Bréb. (A. S. At. Pl. XXVI, fig. 23).
A. crassa Greg. (A. S. Atl. Pl. XXXIX, fig. 30).
* A. cymbelloides Grun. (Hedw. 1867, VI p. 24, Cl. & M.
D. No 147).
Navicula Apis Donk. (A. S. Atl. XII, fig. 23).
X. Advena A. S. Atl. (Pl. VIII, fig. 29).
X. aspera Ehb. (A. S. Atl. XLII, fig. 26).
X. brasiliensis Grun. var.? — L. 0,ogs. Br. 0,os mm. Str.
14 in 0,oi mm.
* X. consors A. S. (Atl. Pl. XLVIII, fig. 24—27).
N. circumsecta Grun. (A. S. Atl. Pl. III, fig. 27).
N. directa Sm. var.? (A. S. Atl. Pl. XLYII, fig. 12 and L
c. fig. 13.)
* N. Leudugeri Cl. N. S. — Elliptic; med. line straight. Stria>
radiant, coarse, 8 in 0,oi mm., composed of 3 to 4 large
elongate and transversely lineate puncta, reaching to the med. line,
except in the middle, where tliev are shortened. L. 0,07 mm. B.
0,oi6 mm. This species resembles X. guttata Grun (A. S. Atl.
Pl. XLVI, fig. 10) but is not so convex and has different
end-pores. — Pl. 36, fig. 22.
N. futilis A. S. (Atl. Pl. XIII, fig. 17, 19).
* X. formosa Greg. (A. S. Atl. Pl. L, fig. 9—10). Str. 15
in 0,oi mm. L. 0,o85 mm. Br. 0,oi8 mm.
* N. Jiuminensis Grun. (A. D. p. 28). L. 0,07 mm. Br. 0,oi
mm. Str. 15 in 0,oi mm.
N. gemmatida Grun. (A. S. Atl. Pl. XIII, fig. 21).
X. Hennedyi W. Sm. (A. S. Atl. Pl. III, fig. 17—18).
X. indica Grev. (T. M. S. II, pag. 95, Pl. IX fig. 13).
X. lacrimans A. S. Atl. (Pl. XII, fig. 61).
X. Lyra Ehb. var.
X. Musca Greg. (A. S. N. D. Pl. I, fig. 15).
X. maxima Greg. var. — A very large form with somewhat
infiated middle and subcuneate ends. Length 0,i6, breadth
0,oi7 mm. Strias 20 in 0,oi mm. at the ends and in the middle.
X. multicostata Grun. (A. S. Atl. Pl. XI, fig. 14—20).
X. nitescens Greg. (A. S. Atl. Pl. VII, fig. 37—41).
X. notabilis Grev. (A. S. Atl. Pl. VIII, fig. 46).
* X. nicobarica Grun. — Only one specimen, perfectly agreeing
with a figure sent by Mr. Grunow but not with the fig. given
in A. Schm. Atl. Pl. VIII, fig. 57 and LXX, fig. 35, 36. The
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