J272 CRUSTACEA. 



medium altior, postice subtriangulata, obtusa, margine supero-postico 

 subtilissimd denticulate. Caput breve, infra truncatum et non rostrate 

 productum, superne visum triangulatum, obtusum. Rami anten- 

 narum posticarum subwqui, setis sat longis. Testa reticulata, areolis 

 angustissime linearibus, obliquis, prope marginern valde latioribus. 



Very tumid, a little oblong, head hardly separated by a constriction, 

 body higher posterior to middle, behind subtriangular, obtuse, on 

 posterior part of back minutely denticulate. Head short, beak 

 horizontally truncate ; seen from above, triangular, obtuse. Pos- 

 terior antennae having the branches longer than base, subequal, 

 setae rather long. Shell reticulated, the cells long linear and 

 parallel, running obliquely, much larger at the margin. 



Plate 89, fig. 4 a, side view of female, enlarged ; b, profile of male ; 

 c, vertical view of head ; d, abdomen in part, with stomach and intes- 

 tine ; e, enlarged view, showing areolation of shell. 



From fresh-water pools, near Sydney, New South Wales. 



Greatest height of male, half the whole length ; of female, three- 

 fourths the length. In the latter, the body behind is obtuse trian- 

 gular; in the former, the dorsal side of the angle rounds into the 

 back; on both there are minute spines along this supero-posterior 

 portion of the shell. The beak is truncate below, and the truncation, 

 though horizontal, is excavate at middle. The eye, as seen in a ver- 

 tical view is placed at a very short distance from the front margin. 

 The abdomen terminates in a pair of slightly curving spines, and 

 also six other pairs of spines of decreasing size, none of which are 

 more than half as long as the terminal. The setae of the antennae are 

 minutely plumose. 



Daphnia australiensis, Dana, Proc. Amer. Acad. Sci., ii. 48. 



Daphnia MACRUEA. 



Gracilis, elongata, testa postice aculeato-productd, aculeo tenui, paulo bre- 

 viore quam corpus. Caput grande, corpore non humilius, supra non 

 discreium, infra nee rostratum; f route latere viso rotundato, superne 



