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A. quaternatus Ehb. (Jan. Guan Pl. I, A., fig. 8).
A. splendens (Shadb.) Ralfs (Halionyx undenarius Jan. Guan.
Pl. I, fig. 1).
* Asteromphalus flabellat us Bréb. (Grev. M. J. VII, p. 160,
Pl. VII, fig. 4 et 5).
Mélosira sulcata Ehb.
M. (Endictya) oceanica Btw. (A. S. Atl. Pl. LXV, fig. 10, 12, 13).
* Podosira Argas Grun. (M. J. 1879, Pl. XXI, fig. 6).
Diameter 0,08 mm. Striae on the rim about 20 in 0,oi mm. The
puncta which compose these strice are arranged in quincunx
as in many species of’ Pleurosigma.
P. maculata W. Sm. (Lagerst. Bih. t. K. Sv. Vet. Ak. HandL
III, No 15, fig. 1).
* P. Montagnei Kiitz. (Van Heurck Syn. Pl. LXXXIV, fig. 11).
* P. ambigua Grun. (A. D. p. 118, M. J. 1879, Pl. XXI, fig. 7).
* P. maxima (Kiitz.) Grun. (A. D. p. 118). Diam. 0,o65 mm.
Umbilic. 0,oi mm. Rowrs of puncta 16 in 0,oi mm. near the
umbilicus, 20 near the margin.
VI. Diatoms from Bab-el-Mandeb.
Between Aden and Bab-el-Mandeb were taken samples oi‘
bottom-mud, which contained, sparsely, some diatoms, among
which I have determined the lollowing:
Amphora zebrina Jan (A. Schm. Atl. Pl. XXV, fig. 11).
A. robusta Greg. (Diat. of Cl. pag. 516, Pl. XIII, fig. 79).
A. Proteus Greg. var.
.1. crassa Greg. (Diat. of Cl. pag. 525, Pl. XIV, fig. 94).
A. furcata Leuduger-Fortm. (Diat. de Cevlan pag. 20, Pl.
I, fig- 11).
A. mexicana A. Schm. (Atl. Pl. XXVII, fig. 47—48).
A. q/mbifera Greg. — Length of valve 0,o85 mm., breadth
0,oii. Strice 8 in 0,oi mm. composed of distinet granules.
Navicula aspera Ehb.
N. directa W. Sm. — Length 0,11 mm. Breadth 0;oi3 mm.
Striae 6 in 0,oi mm.
N. maxima Greg. var. Bleischii Jan (A. Schm. Atl. Pl. L>
fig. 22—25) Length 0,i3 mm. Strice 17 in 0,oi mm.
N. maxima Greg. var. umbilicata Grun. (A. Schm. Atl. PL
L, fig. 32—33) Length 0,is mm. Striae 12 in 0,oi mm. in the
middle, 15 in 0,oi mm. near the ends.
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