28 G- O. Sars. 



in many respects from the previously known genera of this 

 family. As observed by Mr. Richard, it somewhat recalls 

 the genus Acantholeberis Lilljeborg in its external appear- 

 ance ; but in other respects it is very different and more 

 approaching the genus Ophryoxus G. O. Sars. We do not 

 know at present more than a single species, namely that 

 described below. 



9.' Griinaldina Brazzai^ Richard. 



(PI. V). 



Gtrinialdina Brazzai, Richard, Cladocères nouveaux du Congo. Mém. 

 Soc. Zool. de France 1892, p, 214. 



Specific Characters. — Female. Carapace, seen 

 laterally, rounded quadrangular, height about equalling the 

 length, dorsal margin but slightly arched, and terminating be- 

 hind in an obtuse corner, ventral somewhat bulging in 

 front, and passing behind in an even curve into the almost 

 straight posterior margin. Head comparatively small and 

 procumbent, its dorsal margin forming together with that of 

 the carapace a quite even and uninterrupted curve as far as 

 the tip of the rostrum, ventral margin projecting immediately 

 behind the rostrum to a small linguiform lobule. Surface 

 oi shell, as in Simocephalus, sculptured with closely-set and 

 partly anastomosing obliquely transverse striæ, especially 

 distinct on the valves; the latter not admitting of being 

 completely closed below, but leaving in the middle of the ven- 

 tral face a lozenge-shaped open space; setæ of the lower edges 

 comparatively short, though somewhat increasing in length 

 at the infero-posteal corners, lower part of hind edges with 

 a row of short spinules Eye of moderate size, with well 

 marked crystalline cones; ocellus very small, and located 



