common to all the members of the family Cypridinidce. Caudal lamellae com- 

 paratively large, subtriangular in form, and armed with very strong claws 

 gradually increasing in size distally. 



Remarks. This genus was established as early as the year 1840 by M. 

 Edwards, to include a form (C. Reynaudi) captured in the Indian Ocean, and 

 conspicuously differing from any other Ostracods at that time known. Sub- 

 sequently many other species more or less closely agreeing with the form 

 recorded by M. Edwards have been detected, and though some of these have 

 been placed within separate nearly-allied genera, a good deal remain as true 

 members of the old genus Cypridina. A grouping of the latter species has 

 recently been attempted by Dr. Skogsberg, who propose to divide the genus 

 into 5 subgenera, viz., Doloria, Vargula, Macrocypridina, Cypridina (proper), 

 and Siphonostraca. The distinction of these subgenera seems however to me 

 to be in most cases based upon very slight and minutious differences. The 

 2 Norwegian species described below are both referable to the subgenus 

 Vargula of Skogsberg. 



1. Cypridina norvegica, Baird. 

 (Pi. i-ni). 



Cypridina norvegica, Baird, Notes on the genus Cypridina, with description of some new 

 species, Proc. Zool. Soc. London 1860, pag. 200, PI. LXXI, figs. 4, 4 a d. 



Specific Characters. Female. Shell, seen laterally, of a rather regular 

 broadly oval shape, greatest height in the middle and somewhat exceeding 2 /3 

 of the length, dorsal margin quite evenly arched and joining the anterior and post- 

 erior edges without any trace of an intervening angle, ventral margin likewise uni- 

 formly curved, though somewhat less so than the dorsal one, posterior extremity 

 only slightly wider than the anterior and somewhat obliquely blunted, with 

 an indication to a rounded corner below; -- seen dorsally or ventrally, oblong 

 oval in shape, with the greatest width in the middle and about equalling half 

 the length, both extremities obtusely pointed. Frontal incisure of the valves 

 rather deep and narrow, obliquely ascending, being defined below by a 

 rather projecting part of the valve bordered above by a thin transversely striated 

 lamella; rostral prominence narrow acuminate, curved downwards, and having 

 the upper edge quite continuous with the dorsal margin of the shell. Valves 

 semipellucid, with the surface smooth and polished, not exhibiting any obvious 

 sculpture. Eyes comparatively small, each with about 8 lenticular bodies em- 

 bedded in a dark pigment. Ocellus well developed, with the fronal tentacle 



