of the North Atlantic and of North- Western Europe. 651 



1887. Cypridina mediterranean . Sars, G. 0., " Nye Bidrag til Kundskaben om 



Middelhavets Invertebratfauna. iv. Ostracoda 

 mediterranean p. 36, pi. ii., figs. 3—5; pi. vii. ; 

 pi. viii., figs. 1—5. 



1894. „ „ . . MuLLER, G. W., " Die Ostracoden des Golfes 



von Neapel.," p. 206, pi. ii., figs. 1, 2, 4, 5, 

 8-20, 22-26, 33. 



We are not sure what the right name of this species should be. Authors have 

 called it C. mediterranea ; but Costa, in the text of the "Fauna del Regno di 

 Napoli " names it Cypridina Edwardsii, but in description of plate C. mediterranea. 

 As far therefore as that work is concerned it should bear the former of these 

 two names. But this was probably the species described in an earlier paper 

 by Costa,* which neither we ourselves, nor apparently other authors, have seen 

 and as the name ultimately adopted must depend on that used in the paper 

 referred to, we here follow other authors in the use of 0. mediterranea. 



Shell of female regularly oval, greatest height central, extremities diminishing 

 m height equally ; ventral and dorsal margins equally and evenlj^ arcuate 

 throughout, hinder extremity with the upper portion formed by the continued 

 equal sweep of the dorsal margin, lower portion pouting slightly in lip-like 

 manner, but no angularity anywhere ; rostral process, as in the two preceding 

 species ; antennal sinus opening obliquely downwards and forwards, lower 

 margin arching, with continued sweep, from the bottom of the sinus to unite 

 without angularity, with the ventral margin — this description applies to the 

 shell itself, not to the thin lamina, which, springing from its inner side 

 surrounds and contracts, as usual, the antennal sinus ; valves glabrous, less 

 strong than in the preceding species, but Sars says : " Interdum valde calcarese 

 et opacse." Seen from above the form is regularly ovate, the greatest width 

 central, and thence tapering evenly to the extremities, which are sub-equal. 

 Length, 2-9 mm. ; height, 2 mm. The eyes are rather large. The sensory 

 appendage of the fifth joint of the antennules (PI. lv., fig. 3) has the filaments 

 pinnately arranged in two lines, and few in number (about ten). The small 

 branch of the antennae is of the same general form as in C, norvegica, but much 

 smaller, its joints very short, but the terminal seta is of considerable length • 

 the swimming setae of the swimming branch are eleven in number, there is a 

 spine by the base of each of the larger ones (PI. lv., fig. 5), and the first setae 

 is not plumose, but spined on one side. The vibratory lamina of the penultimate 

 limbs is triangular (PI. lv., fig. 9), with the marginal setae uninterruptedly 



* 0. G. Costa, " lUustrazioni al genere Cypridina e descrizione di una novella specie Dona della 

 Accad. Pontaniaaa agli Scienz. Ital.," p. 57. 



