119 



43. Cypricercus affinis (Fischer), 



(PI. LV, fig. 1). 



Cypris affinis, Fischer, Mem. Acad., St. Petersburgh, Vol. 7, p. 32, PI. X, figs. 911. 

 Syn : Cypris reticulata, Zaddach. 

 fuscata minor, G. W. Miiller. 



Encvpris fuscata affinis, G. W. Miiller. 

 affinis hirsuta, Aim. 



Specific Characters. Female. Shell, seen laterally, oval or somewhat 

 club-shaped in outline, greatest height considerably exceeding half the length, 

 dorsal margin somewhat gibbously arched in front of the middle and sloping 

 with an almost straight course both in front and behind, ventral margin very 

 slightly sinuated in the middle and gently curved upwards behind, anterior 

 extremity well rounded off, posterior rather narrower and obtuse at the end; 

 seen dorsally, regularly oval in outline, with the greatest width about equal 

 to the height, both extremities obtusely pointed. Valves more unequal than 

 in C. fuscata, the left one considerably overlapping the right along the anterior 

 extremity; surface smooth and clothed with delicate hairs; inner duplicatures 

 comparatively broader than in the preceding species. Natatory setae of the 

 posterior antenna? extending somewhat beyond the apical claws. Spines on 

 the outermost masticatory lobe of the maxillae indistinctly denticulated. Caudal 

 rami of the structure characteristic of the genus, but somewhat less slender 

 than in the preceding species, distal claw attaining half the length of the ramus. 



Colour light yellowish, with a slight olivaceous tinge, and without any 

 sharply marked dark patches. 



Length of adult female amounting to 1.20 mm. 



Male unknown. 



Remarks. The specific name reticulata proposed by Zaddach and assigned 

 by some recent authors to this species must, I think, be wholly discarded, as 

 only applying to immature specimens, and I have shown above, that the 

 Cypris tesselata Fisher is of a similar kind, being in all probability only 

 founded on immature specimens of Eucypris virens. It remains to consider 

 the 2 species described by Fischer as Cypris affinis and C. hirsuta, which 

 both are unquestionably referable to the present genus. These 2 species have 

 by most recent authors been combined and only regarded as varieties of one 

 species, which is named by Dr. Aim Eucypris affinis-hirsuta. I have however 

 convinced myself that these 2 forms are in reality specifically distinct, and 

 that of course the 2 names proposed by Fischer ought to be supported in the 

 sense originally taken by that author. To the present species the specific 



