182 Mr. G. 8. Brady on Marine Ostracoda 
Cythere convoluta, nov. sp. (Plate XII. figs. 3, 4.) 
Carapace of the female (?), seen from the side, subquadrangular, 
highest in front of the middle ; areatest height equal to 
about two-thirds of the length: anterior extremity broadly 
rounded ; posterior produced below the middle into a broad 
shghtly dentate process, emarginate above : superior margin 
slightly arched in front, excavated behind the middle ; in- 
ferior almost straight, bending upwards behind. Seen from 
above, the outline is irregularly ovate or subhexagonal, 
constricted in the middle, broadly mucronate before and 
behind; greatest width near the middle, equal to more than 
half the length. Surface of the valves sculptured with pro- 
minent, flexuous, reticulating ridges, and with a prominent 
sharp crest running entirely round and a little within the 
margins, but less conspicuous posteriorly. Length ,!, inch. 
Oytheridea punctillata, Brady. 
Cytheridea punctillata, Brady, Ann. & Mag. Nat. Hist. 1865, vol. xvi. p. 189, 
pl. 9. figs. 9-11. 
Carapace of the female (?), seen from the side, subreniform, 
highest in front of the middle; greatest heig ht equal to half 
the length: anterior extremity well and evenly, posterior 
obtusely rounded: superior margin gently arched, inferior 
nearly straight. Seen from above, ovate, pointed in front, 
broadly rounded behind, scarcely constricted in the middle ; 
greatest width near the posterior extremity, equal to about 
half the length. Surface marked with closely set rounded 
puncta, and a few minute round papille. 
I cannot distinguish the examples here described from the 
European species Cytheridea punctillata, which occurs abun- 
dantly in some parts of the British and Scandinavian seas, 
and also, as a fossil, in the posttertiary clays. There are, 
indeed, some slight differences of form ‘and sculpturing ; but 
these seem subject to much variation, and are certainly not of 
sufficient importance to warrant our regarding them as indices 
of specific rank. 
Cytheridea spinulosa, nov. sp. (Plate XIII. figs. 1-6.) 
Structure of the shell very robust and thick; valves tumid. 
As seen from the side, almost elliptical, highest near the 
middle ; greatest height equal to more than half the length; 
extremities broadly and obtusely rounded, and bearing be- 
low the middle a series of (about twelve on the anterior and 
six on the posterior) short rounded marginal teeth : superior 
margin feebly arched, highest in the middle ; inferior almost 
