in the West of Ireland. 369 



middle. Outline, as seen from above, compressed, oblong, 

 obtusely pointed in front, truncate beliind, the sides deeply 

 emarginate near the posterior extremity ; widest behind the 

 middle ; greatest width not much exceeding one-third of 

 the length. Shell of the male longer and narrower. Sur- 

 face of the valves irregularly sculptured in a flexuous man- 

 ner. Colour yellowish brown, the raised ornament often 

 deeply tinged with slaty blue or black. Length -^ inch. 



In the * Monograph of the Recent British Ostracoda,' this 

 species was confounded with Cythere hadia^ Norman, to which 

 it bears considerable resemblance. G. hadia^ however, has 

 only a vaguely punctate surface-ornament, without any trace of 

 the conspicuous flexuous rugaj which mark C. cicatricosa ; the 

 dorsal aspect of the fonner is also regularly ovate, while that of 

 the present species is distinctly truncate behind. The figm-es 

 in the ' Monograph ' give a correct idea of the true C. hadia^ 

 and, when compared with those given here, will show more 

 clearly than a verbal description the differences between the 

 two species. The form described and figured by Mr. Brady, 

 in the ' Annals and Magazine of Natural History,' under the 

 name of G. crispata^ does not differ materially from the pre- 

 sent, except in its greater size and its more prominent and 

 profuse surface-sculpture. The northern species may perhaps 

 be looked upon as a depauperized form of the Mediterranean 

 G. crispata ; and this view derives some confirmation from its 

 greater abundance on the western shores of Ireland. 



The specific name cicatricosa has been used by Reuss and 

 Bosquet to designate a species which we believe to be identical 

 with Gythere convexa, Baird ; but as Dr. Baird's name is of 

 prior date, the proper course seems to be to reserve the term 

 cicatricosa for the species so named by G. O. Sars, which is 

 undoubtedly identical with that under consideration. 



It should be mentioned that while C. hadia seems to be a 

 purely littoral species, G. cicatricosa is not met with except 

 by the dredge. The localities given in the ^ Monograph ' (for 

 G. hadia) must be taken as belonging to the present species, 

 except those to which the Rev. A. M. Norman's name is 

 attached. 



Genus LiMNiCYTHERE, Brady. 



Limnicythere Sancti-Patricii^ nov. sp. 

 PI. XVIII. figs. 8-11, and PI. XXI. fig. 4. 



Carapace (of the male?), as seen from the side, reniform, nearly 

 equal in height throughout, height equal to half the length ; 

 extremities well rounded, the anterior slightly tlie broader ; 

 superior margin almost straight, inferior deeply sinuated in 



