Fresh-water Entoraostraca oi South America. 21 



and from New Guinea. Finally, J have myself reared this 

 form from mud taken in two widely distant places, viz., at 

 Knysna, Cape Colony, and in Sumatra on the Helvetic Estate. 



6. Ceriodaphnia Richardi n. sp. 



(PL III, figs 11—15). 



Specific Characters. — Female. Carapace 

 not very tumid, seen laterally oval quadrangular in ontline, 

 dorsal margin slightly arched, ventral almost straight in the 

 middle, and passing without any intervening angle into the 

 somewhat obliquely curved hind margin, posterior projection 

 rather prominent, and placed somewhat above the axis of 

 the body. Head much depressed and procumbent, frontal 

 part rounded and forming an obtuse angle behind, fornix 

 evenly curved, without forming any projecting lappet above 

 the base of the antennæ. Surface of shell faintly reticulated 

 with comparatively small and irregularly polygonal meshes, 

 free edges of valves smooth. Eye rather large, filling up 

 the frontal part, crystalline cones very distinct; ocellus 

 small, punctiform, and in the usual place. Antennulæ very 

 short, sensory bristle issuing at a short distance from the 

 tip. Antennæ normal. Caudal part o nearly equal breadth 

 throughout, anal denticles rather strong, 8 on each side, 

 caudal claws with about 6 secondary denticles in their 

 proximal part. Body pellucid, with a faint greenish tinge. 

 Length of adult ovigerous female 0.95 mm. 



Remarks. — In a paper on South American Ento- 

 mostraca, Mr. Richard mentions a Ceriodaphnia under the 

 name of C. reticulata Jurine, var., which I believe may be 



