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 papillse. Lucid spots about four, somewhat obliquely placed 

 near the centre of the valves. 



Length 4^ in. ('6 mm.). 



Hab. Levant (sponge-sand). Several specimens. 



4. NORMANIA GRISEA, n. Sp. (PI. LXI. fig. 10, tt-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 areolae of a lighter colour than the rest of the shell. 



Length -^ in. ('508 mm.). 



Hab. Smyrna (shallow water). One specimen. 



5. NoRMANiA MODESTA, n. sp. (PI. LXI. fig. 13, «, 6.) 



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 ^g- in. ('58 mm.). 



Hab. Smyrna (shallow water). One specimen. 



6. NoRMANIA DORSO-TUBERCULATA, n. Sp. (PI. LXI. fig. 14, tt-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 -^ in. ('.57 mm.). 



ifa6. West Indies (shallow water). Several specimens. 



Genus Cythereis, 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. 



