BY THE REV. R. L. KING, B.A. 



163 



Beak 



Carapace 



Stria; 



Joints of antennae 



Basilar portion of 

 Rami 



Branches of ditto 



Tridactyle feet of 

 male 



Branchial feet of 

 female 



Lobes on ditto . . 



Last segment of ab- 

 domen 



Caeca 



LIMNADIA. 



short 

 with shield-like 

 flaps 

 few 

 4—8 

 8— 10 jointed 



8 or more jointed 

 2 pair 



17 pairs 



9 



with immoveable 



spines 



numerous 



produced 

 bivalve 



many 



many 



manj' jointed 



many jointed 

 2 jjair 



21—27 pairs 



9 



with moveable 



spines 



LIMXETIS 

 MACLEAYANA. 



produced 

 bivalve 



none 



two 



two jointed 



many jointed 

 one pair 



11 pairs 



10 



spineless but 



haiiy 



numerous 



In Limnetis MacLeayana the antennae are bi-articulate, the se- 

 cond joint being covered on the upper surface with numerous 

 papillce, from each of which a minute seta springs. The rami are 

 composed of a basilar portion consisting of two joints, the second 

 of which carries two multiarticulate arms, from each joint of 

 which a long plumose seta proceeds. The rami are the sole 

 organs of locomotion. The tridactyle feet of the male are two 

 in number, the clasping joint being very strong. The branchial 

 legs are 10 pairs in the male, 11 pairs in the female, and are 

 composed of 10 distinct lobes, and differ principally from Isaura 

 and Limnadia in having a second hairless lobe on the external 

 edge — an important particular in which it agrees with Artemia. 



The exact use of these hairless lobes, which exist in the 

 Daphniadce and (certainly some Lynceidce) as well as in the 

 Phyllopoda and Apus does not appear to have been clearly made 

 out. They are generally protected from injury by a strong hairy 

 lobe directed backwards. It is this lobe, in our present species, 

 on the 7 — 10 branchial legs which carries the ova. 



Some very young specimens were captured near Denhara Court 

 in the month of July. Adrdts were obtained in one of the Botany 

 swamps (since drained) in the beginning of Octobei", at which 

 time the young ones captured in July had attained the adult 



