510 ÖDEVE, DIATOMS. 
ÅA. quaternatus Ehb. (Jan. Guan Pl. I, A., fig. 8). 
ÅA. splendens (Shadb.) Ralfs (Halionyx undenarius Jan. Guan. 
Pl.) Me) 
= Asteromphalus fAabellatus ”Bréb. (Grev. M. J. VII, p. 160, 
Plvi fig Afetjo): : 
Melosira sulcata Ehb. 
M. (Endictya) oceanica Btw. (A.S. Atl. P1. LXV, fig. 10, 12,13). 
+ Podosira Argus Grun. (M. J. 1879, Pl. XXI, fig. 6). .Dia- 
meter 0,,8 mm. Strie on the rim about 20 in 0,01 mm. 'The 
puncta which compose these strie are arranged in quincunx 
as in many species of Pleurosigma. 
P. maculata W. Sm. (Lagerst. Bib. t. K. Sv. Vet. Ak. Handl. 
TITT, NOFLS Gore): 
= P. Montagnei Kätz. (Van Heurck Syn. P1. LXXXIV, fig. 11). 
<P. ambigua Grun;(A. D. ps 118, M. J: 1879, Pl, XXL fig. 1). 
+= P. maxima (Kätz.) Grun. (4. D. p. 118). Diam. 0,065 mm. 
Umbilic. 0,01 mm. Rows of puncta 16 in 0,01 mm. near the 
umbilicus, 20 near the margin. 
VI. Diatoms from Bab-el-Mandeb. 
Between Aden and Bab-el-Mandeb were taken samples of 
bottom-mud, which contained, sparsely, some diatoms, among 
which I have determined the following: 
Amphora zebrina Jan (ÅA. Schm. Atl. Pl: XNV, fig. 11). 
ÅA. robusta Greg. (Diat. of Cl. pag.o516, PIX fö T9). 
A. Proteus Greg. var. 
A. erassa Greg. (Diat. of Cl. pag. 525, Pl. XIV; feg. 94). 
A. furcata Leuduger-Fortm. (Diat. de Ceylan pag. 20, Pl. 
I, fig. 11). 
AA. mexicana A. Schm. (Atl. P1. XXVII, fig. 47—45). 
4. cymbifera Greg. — Length of valve 0,085 mm., breadth 
0011.  Strie 8 in 0,01 mm. composed of distinct granules. 
Navicula aspera Ehb. 
N. directa W. Sm. — Length 0,11 mm. Breadth 0013 mm. 
Strie 6 in 0,01 mm. 
N. maxima Greg. var. Bleischii Jan (A. Schm. Atl. Pl. L, 
fig. 22—25) Length 0,13 mm. Strie 17 in 0,01 mm. 
N. maxima Greg. var. umbilicata Grun. (A. Schm. Atl. Pl. 
L, fig. 32—33) Length 0,13 mm. Strie 12 in 0j01 mm. in the 
middle, 15 in 0,01 mm. near the ends. 
