of the North Atlantic and of North- Western Europe. 701 



1887. Halocypris Clausii, . . Saes, Gt. 0., "Nye Bidrag til Kundskaben om 



Middelhavets Invertebratf auna : iv. Ostra- 

 coda Mediterranea," p. 87, pi. xi., figs. 

 7-10; pi. xiv., figs. 6-18. 



1890. ,, ,, . . Claus, " Die GattuDgen und Arten der mediter- 



ranen und atlantischen Halocypriden," 

 p. 22. 



1891. ,, ,, . . Claus, " Die Halocypriden des atlantischen 



Oceans und Mittelmeeres," p. 73, pi. xx. 

 1894. Conchoecia Clausii, . . Muller, Gr. W., " Die Ostracoden des Golfes von 



Neapel.," p. 230, pi. vi., figs. 21, 23-30; 

 pi. viii., figs. 31, 32. 



Shell of the female, seen latei'ally, broadly sub-ovate, very short and high ; 

 length not much greater than the height ; dorsal margin almost straight, ventral 

 evenly, and boldly convex, and forming a continuous curve with the anterior and 

 posterior margins ; rostrum rather large, curved and prominent ; sinus of moderate 

 size; anterior extremity curved, rather prominently arched below the sinus, 

 slightly narrower than the posterior, which is sub-truncate, very boldly rounded 

 at its junction with the ventral margin and not at all produced at the obtuse 

 dorsal angle. Seen from above, the outline is broadly ovate, widest behind the 

 middle ; width considerably more than half the length. Shell of the male rather 

 narrower ; seen from above, widest towards the front (Sars). Surface of the 

 valves strongly reticulated. Length of the female "78 mm. ; of the male '72 mm. 

 Frontal tentacle of the female (fig. 7) not reaching beyond the extremity of the 

 limb, nearly straight, capitulum obtuse ; that of the male much longer than 

 the limb ; capitulum curved, spoon-like, dilated at the base. Antennules of 

 the female small, imperfectly jointed, the sensory setas sub-equal, furcate ; 

 antennules of the male (fig. 5) five-jointed, the two basal joints very stout, 

 the rest very small ; the proximal sensory filament is about as long as the 

 second joint of the antennule and fui-cate ; the distal filament simple and 

 about half as long as the other ; of the three long setae the distal one bears on 

 its inner margin a series of (seven to fourteen, Claus), small button-like nodules 

 (fig. 6) which are set in a single row and wide apart. Hooked appendage of the 

 antennae (fig. 8), strongly bent and thickened towards the base. The male copu- 

 latory organ (fig. 9) has the distal half of its posterior margin annulated. The 

 other organs present no special diagnostic characters. 



Capri ; Las Palmas, 450 metres ; Funchal, 500 metres (Claus) ; Messina 

 (G. 0. Sars); Naples (A. M. N., and G. W. Muller). 



TBANS. EOT. DUB. SOC. N.3. VOL. V., PABT Xn. 5 J" 



