180 BRIGHTWELL, ON DIATOMACES. 
N.A., Professor Bailey. Mr. T. West has seen a specimen 
from Thames mud. (PI. IX, fig. 5.) 
6. Stauroneis fulmen, n. sp.—F. V. oblong; V. lanceolate 
acute. Margin with a marked double inflexion on each side. 
Stauros very slightly, if at all, dilated towards the margin of 
the valve. Striz fine and sharp, 22 in ‘001. Length from 
"008 to -015. 
Fresh water, Melbourne, N. 8. W., Mackie. (Plate IX, 
ne=.60, V.; 60, F. V.) 
7. Pleurosigma longina, P. Smith.—V. lanceolate, flexure 
moderate, extremities greatly elongated; acute; colour faint 
straw ; striz transverse, 36 in ‘001; length from -02 to ‘025. 
Arctic Regions, Dr. Sutherland. (Pl. IX, fig. 7.) 
8. Odontidium speciosum, n. sp.—Valve subcruciform or 
rhomboidal, angles rounded, naked, costz short, distinct, 
sixteen on each side. (Pl. IX, fig. 8, a, side view; 4, front 
view.) Shell cleanings. 
9. Odontidium punctatum, n. sp.—Valve subrhomboidal, 
angles pointed, cellular, obscurely punctato-striate, without 
cost. (Pl. IX, fig. 9.) Shell cleanings. 
10. Odontidium Baldjickii, n. sp.—Valve ovately rhom- 
boidal. Costz about twenty on each side the median line, 
distinct, reaching nearly to, but leaving a linear open space 
down the centre. (Pl. IX, fig. 10). 
From a clay or earthy deposit found on bones imported 
from Baldjick, near Varna, Mr. Norman. 
The species last described are allied to O. Harrisonii of 
Professor Smith, and we refer to his observations (‘S. B. D.,’ 
vol. i, p. 18), as to their true position in a systematic arrange- 
ment. 
11. Rhabdonema mirificum, Professor Smith.—“ Septa 
with three to twelve irregular perforations.” 
See Dr. Walker Arnott’s observations, ‘Mic. Journal,’ 
vol. va, p..92. (Pl. IX, fig. 11) 
12. Triceratium (?) dubium, n. sp.—Valve clypeate, punc- 
tate, with six rounded projections, the lower one elongate. 
Mauritius. (Pl. IX, fig. 12, a, side view; 6, front view.) 
We place this species (which is not of unfrequent occur- 
rence) provisionally among the Triceratia. It probably 
forms the type of a new genus. 
