KNOWN SPECIES OF MARINE OSTRACODA. 383 
border, which is much produced anteriorly. Dorsal margin nearly straight ; ventral 
margin convex, sinuated at its anterior third. Extremities narrow, rounded. Dorsal 
outline broadly oval, with produced, pointed extremities. Surface smooth, polished, 
bearing distant scattered papillz. Lucid spots about four, somewhat obliquely placed 
near the centre of the valves. 
Length 3; in. (‘6 mm.). 
Hab. Levant (sponge-sand). Several specimens. 
4. NorMANIA GRISEA, n. sp. (PI. LXI. fig. 10, a-c.) 
Carapace obliquely quadrilateral, convex. Dorsal and ventral margins convex, the 
latter slightly sinuate posteriorly. Anterior extremity broad, rounded, bordered by a 
flattened lamina. Posterior extremity narrowed, rounded. Dorsal profile oval, with 
acute extremities. Surface smooth, finely and sparingly punctate; the punctations 
surrounded by areole of a lighter colour than the rest of the shell. 
Length 35 in. (‘508 mm.). 
Hab. Smyrna (shallow water). One specimen. 
5. NorMANIA Mopgesta, n. sp. (Pl. LXI. fig. 13, a, 0.) 
Valves oblong-oval, convex. Extremities obliquely rounded and narrowed; the 
anterior produced into a flattened lamina, the posterior obliquely truncate above. The 
dorsal margin is straight ; the ventral convex, and indented at its junction with the 
flattened anterior border. Surface punctate. Dorsal profile ovate-oblong, with some- 
what pointed extremities, slightly keeled. 
Length #5 in. (‘58 mm.). 
Hab. Smyrna (shallow water). One specimen. 
6. NoRMANIA DoRSO-TUBERCULATA, n. sp. (Pl. LXI. fig. 14, a-g.) 
Carapace obliquely quadrilateral, convex. Anterior extremity compressed, rounded ; 
posterior broad, obliquely rounded. Ventral margin arched, sinuate at anterior third ; 
dorsal margin straight behind, sloping steeply in front. Dorsal outline ovate: on each 
side of the median line posteriorly there is a large tubercular elevation, directed back- 
wards. In front of this, and extending nearly to the posterior extremity, is a row of 
minute spines running parallel to the hinge-margin of each valve. Some specimens 
exhibit an additional tubercle on the centre of each valve. 
Length #5 in. (‘57 mm.). 
Hab. West Indies (shallow water). Several specimens. 
Genus Cyrtuerets, Jones (subgenus). 
Animal unknown. Valves quadrilateral, longitudinally rugose or tuberculated, bor- 
dered with elevated ridges or rows of spines; the tubercle over the anterior hinge 
‘strongly developed. Hinge joint as in Cythere; the bar and furrow obsolete. 
