370 Messrs. Brady and Robertson on Dredging 



the middle. Seen from above, the outline is irregularly 

 rhomboidal, widest somewhat behind the middle ; extremities 

 acuminate ; greatest width rather less than the height. Seen 

 from the front, the outline is widest at the base, with gra- 

 dually converging sides and broadly arched apex ; ventral 

 margin convex, and prominently keeled in the middle. 

 Surface of the valves sculptured with small, closely-set, 

 polygonal excavations, marked across the middle with a 

 conspicuous broad and deep curved furrow, in front of which 

 is another, of similar character, but smaller ; behind the 

 posterior furrow the shell rises towards the ventral surface 

 into a prominent rounded eminence : the ventral surface is 

 furrowed in a longitudinal direction, and also marked more 

 or less with cross strise. Animal almost exactly like that of 

 L. inopinata. Copulative organs of the female (PI. XXI. 

 fig. 4 c) subquadrangular, upper portion (b) elongated and 

 ending in a short seta. Abdomen slightly hirsute, produced 

 into two lobes, each with a short terminal seta (a). 

 Ilab. Lough Moher, about five miles south of Westport, 

 county Mayo. 



All the full-grown specimens which we have examined of 

 this very well-marked species possess the peculiar appendages 

 represented in PL XXI., and which for the present we suppose 

 to be the female copulative organs. Whatever they may be, 

 they seem to be homologous with the parts of L. inopinata 

 figured in the ' Monograph of Recent British Ostracoda,' 

 pi. 38. fig. 9 m • and their presence in this peculiar form will 

 probably constitute a good generic character. 



Genus Cytheridea, Bosquet. 

 CytJieridea (?) cornea, nov. sp. PI. XX. figs. 9, 10. 



Carapace, as seen from the side, subovate, highest in the mid- 

 dle ; greatest height equal to less than half the length ; an- 

 terior extremity well rounded, the posterior somewhat flat- 

 tened ; superior margin evenly arched, inferior almost 

 straight. Seen from above, ovate, pointed in front, greatest 

 width behind the middle, equal to the height. Shell thin 

 and fragile, quite smooth, very sparingly punctate. Length 

 4V inch. 



Ilab. Dublin Bay, 2-4 fathoms, near the Pigeon-house ; West- 

 port Bay, 2-4 fathoms. 



Genus Eucythere, Brady. 

 Eucy there declivis, var. prava. PL XXI. figs. 12-14. 

 Some specimens identical in character with those here re- 



