KNOWN SPECIES OF MARINE OSTRACODA. 369 
set rounded pits of irregular size. In the intervals between the hollows, especially near 
the ventral border, small tubercles are situated. These, however, are few in number 
compared with the pits. 
Length 75 in. (‘63 mm.). 
Hab. Hunde Islands, 28-40 fathoms (Dr. Sutherland’s dredgings). One valve. 
The shell-sculpture of this species agrees very much with that of Cythere kostelensis 
as described by Dr. Egger; but in other respects it seems to be perfectly distinct. 
8. CyrHERIDEIS TIGRINA, n. sp. (PI. LVIII. fig. 5, a-d.) 
Valves oval, convex ; extremities rounded, nearly equal. Anterior margin forming a 
wide flattened lamina. Dorsum arched. Ventral margin slightly convex, sinuate at its 
anterior third. Seen from above, the carapace is ovate, pointed in front, well rounded 
behind. Surface smooth, white or light grey, marked with bands or patches of brown, 
and bearing a few scattered papillz. 
Length +5 in. (‘5 mm.). 
Hab. Australia (littoral shell-sand, Melbourne). Many specimens. 
Genus Cyrueripgea, Bosquet. 
Animal a Cythere. Carapace subtriangular or triangularly ovate, highest usually be- 
neath the anterior hinge. Surface smooth, papillose, or pitted, occasionally reticulated. 
Hinge-margin of the right valve marked by a series of small tubercles, which are 
received into corresponding depressions of the opposite (left) valve. These tubercles or 
crenulations are mostly disposed in two terminal groups (see Pl. LVIII. fig. 11 d, 
fig. 13 d), and the intervening portion of the valve-margin is plain or may be marked 
by minute tubercles on the /eft and corresponding fosse on the right valve. Ventral 
margin somewhat incurved. Lucid spots arranged in a transverse row near the centre 
of the valve; mostly one or two detached spots in front of the main group. 
1. CyrHeripga KirkKBII, n.sp. (Pl. LVIIL. fig. 14, a—c.) 
Valves oblong, oval or subtetragonal, not twice as long as broad, scarcely at all 
narrowed posteriorly. The ventral margin is nearly straight, with a slight median con- 
vexity. The anterior, posterior, and dorsal margins are all arched and somewhat 
flattened. The anterior and posterior borders are often armed on their lower portions 
with a series of blunt teeth, about eight in number at each end ; but very frequently one 
or both extremities are destitute of these. Dorsal aspect oblong-oval. Surface quite 
smooth or marked with faint, shallow, and distant pittings, bearing also a few scattered 
hairs. Lucid spots large, angular, arranged irregularly a little in front of the centre of 
the valve. 
Length 35 in. (‘84 mm.). 
Hab. Honduras (calcareous sand, shallow water). Many specimens. 
VOL, V.—PART V. 3.¢ 
