of the North Atlantic and of North- Western Ewope. 709 



separate it decisively from that species. So far as the shell is concerned, it seems, 

 compared with P. orbicularis, to be more evenly rounded when seen laterally, to 

 be devoid of reticulation and light yellowish-green in colour. 



3. Polycope pustulata, Gr. 0. Sars. 



1890. Polycope pustulata, . . Saks, G. 0., " Oversigt af Norges Crustaceer, 



II. Branchiopoda, Ostracoda, Cirripedia" 

 (Christiania Vidensk.-Selsk. Forhand.), p. 53 

 (separate copy). 



Shell, seen from the side, sub-circular ; anterior extremity scarcely produced ; 

 posterior subtruncate, its superior angle distinct, inferior obsolete ; dorsal margin 

 strongly arcuate, and almost angulated in the middle ; ventral evenly convex. 

 Seen from above, the outline is narrowed in front, very wide behind, ar.d showing 

 on each valve behind the middle a rounded pustuliform eminence. Valves 

 smooth, scarcely reticulated, minutely denticulated on the ventral margin. 

 Colour as in P. orbicularis. Length '55 mm. 



Habitat. — West coast of Norway, extremely rare. 



This species we have never seen. Professor G. 0. Sars, whose description is 

 quoted above, has taken only one specimen, and it does not seem to have been 

 noticed by any other naturalist. 



4. Polycope dentata, G. S. Brady. 



1866. Polycope\^.) dentata, . . Beady, G. S., " Monograph of the Recent British 



Ostracoda," p. 472, pi. xxxv., figs. 58, 59. 



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



von Neapel." p. 233, pi. vii., figs. 16-23 ; 

 pi. viii., fig. 25. 



We have not ourselves met with any specimens of this species other than that 

 on which the original description was based, but G. W. Miiller has recently 

 found it sparingly in the Mediterranean, and has figured both sexes in his work 

 on the Ostracoda of that region. 



Genus PoLYCOPSis, G. W. Miiller. 



Shell, as in Polycope, but serrated on the anterior margin. Antennules five- 

 jointed, first and second joints large, the last three joints small, anterior margin 

 of the second joint forming two massive digitiforni prolongations, each of which 



TEANS. EOT. DTJB. SOC, N.S. VOL. V., PAET XU. .5 Gr 



