185 



the length, dorsal margin gibbously projecting in the ocular region, behind 

 which it exhibits a distinct concavity, thence gently arched and joining the 

 hind margin by an abrupt curve, ventral margin nearly straight, anterior 

 extremity broadly rounded off, posterior obliquely truncated and very slightly 

 emarginated in the middle, lower corner somewhat projecting, but obtuse at 

 the end; seen dorsally, oblong ovate in outline, with the greatest width 

 behind and nearly attaining half the length, side-edges almost straight in the 

 middle and slightly angular behind, anterior extremity obtusely pointed, posterior 

 triangular. Valves less unequal than in the preceding species, with the surface 

 slightly uneven, exhibiting in the posterior part, below', a broad rounded 

 expansion, above a somewhat angular prominence, anterior edge and lower 

 part of posterior regularly crenulated and clothed with fine hairs; sculpture less 

 strongly marked than in the preceding species, the pittings being rather smaller 

 and more densely set. Eyes rather large and conspicuous, elliptical in shape. 

 Anterior antennae nearly as in the preceding species, the posterior ones however 

 with the apical claws comparatively more slender. 



Male not yet observed. 



Remarks. The present species is nearly allied to H. emarginata, but of 

 smaller size, and differing somewhat in the shape of the shell, as seen laterally, 

 It is moreover easily distinguished by the well-marked crenulation of the 

 anterior edges and the lower part of the posterior ones, this character having 

 indeed given rise to the specific name proposed. 



Occurrence. I have only had an opportunity of examining a few female 

 specimens of this form, taken several years ago at Langesund, south coast of 

 Norway. Norman has however found it also in 2 localities of the western 

 coast, Lervik and Korsfjord. 



Distribution. British Isles, Dawis Strait, Greenland. 



87. Hemicythere finmarchica, G. O. Sars. 



(PI. LXXXV, fig. 3). 

 Cythereis finmarchica, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 41. 



Specific Characters. Female. Shell, seen laterally, elongate subquadran- 

 gular in shape, slightly higher in front than behind, greatest height scarcely 

 exceeding half the length, dorsal margin somewhat angularly bent in the 

 ocular region, thence almost straight and gently sloping behind, ventral margin 

 very slightly sinuated in front of the middle, anterior extremity broadly rounded, 

 posterior rather narrower and obliquely truncated, with a very slight emargination 



23 Crustacea. 



