KNOWN SPECIES OF MARINE OSTRACODA. 373 



Extreme forms of this variety are very distinct from well-marked examples of the 

 typical C.jurinei; but in the gathering from which my specimens were taken there 

 occur many individuals intermediate between the two. This, with the smaller size and 

 more delicate marking of the variety costata, leads me to infer that it is only the 

 young or a variety of C. jurinei. 



3. Cythere hodgii, n. sp. (PI. LIX. fig. 3, a, b.) 



Carapace oblong-oval, convex. Dorsal and ventral margins gently arched. The 

 anterior border is well rounded, forming a flattened lamina, and is armed inferiorly with 

 several short, blunt teeth. Posterior border narrowed, bearing three spines, one of 

 which is very long. Dorsal aspect ovate. Surface of the shell smooth, marked on its 

 posterior half with longitudinal rows of pittings, which partially coalesce so as to form 

 moniliform furrows. 



Length yg- in. ('79 mm.). 



Hab. Levant (sponge-sand). One specimen. 



4. Cythere (?) mamillata, n. sp. (PI. LIX. fig. 6, a-c.) 



Oblong, subreniform, broadest in front, twice as long as broad. Anterior margin well 

 rounded, produced downwards below the level of the ventral margin ; posterior margin 

 narrow, bent in the middle at an obtuse angle. Dorsal margin arched ; ventral margin 

 straight. Dorsal profile oval. Surface of the valves minutely punctate, and raised into 

 several irregularly placed, rounded elevations or mamillae. 



Length gV in- ('32 mm.). 



Hab. Atlantic Ocean, 110 fathoms. One valve. 



5. Cythere oblonga, n. sp. (PI. LIX. fig. 5, a-d.) 



Carapace oblong, quadrilateral, convex, more than twice as long as broad. Extre- 

 mities truncate, anterior obliquely rounded and often toothed, posterior obliquely flat- 

 tened, produced and often serrated inferiorly. Dorsal margin slightly convex, ventral 

 incurved along its whole length. Dorsal aspect broadly oval. End view oval, broadest 

 in the horizontal diameter. Surface of valves marked with somewhat distant, oblong, 

 pittings. 



Length -^ in. (-84 mm.). 



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



6. Cythere canaliculata, Reuss. (PI. LIX. fig. 4, a-f.) 



Cypridina canaliculata, Reuss, Haidinger's Abhandl. iii. p. 76, t. 9. fig. 12, 

 Cythere canaliculata, Egger, Ostrak. der Miocan-Schicht. p. 33, t. 5. figs. 10, 11. 



Carapace oblong, sigmoid, compressed. Extremities well rounded, the anterior dis- 

 tantly and bluntly serrated. The antero-inferior and postero-superior angles somewhat 



