80 TllANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Corynura discaudata, n. sp. (PL VI., figs. 1 — 11, PI. VII. , 



%s. 1, 2.) 



Length (female, exclusive of tail setae) , 225 mm. Anterior 

 antennae long and slender, about the length of the entire 

 animal, exclusive of the caudal segments (fig. 1) ; 18-jointed 

 in the female (fig. 2), and 19 or 20 in the male, right (fig. 10), 

 the former having six long setae and several short spinous 

 ones on the upper surface, and several long plumose setae 

 at the apex and shorter ones on the 1st and 2nd joints. 



The right antenna (fig. 10) of the male is geniculated 

 between the 14th and 15th joints, and is profusely clothed 

 with short setae on the upper surface, the apical setae only- 

 being finely plumose. The proportional lengths of the 

 joints in the female antennae are as follows : — 



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 

 12 21 8 21 10 12 12 14 15 19 19 20 18 16 16 17 21 13 



Both branches of the posterior antennae (fig. 3) are 2- 

 jomted, those of the outer joint being of about equal 

 length. The basal joint of the inner branch is very short, 

 and the apical joint considerably larger than those of the 

 outer branch. 



The mouth organs are similar to those of C. gracilis 

 with the exception of the mandible palp (fig. 4), the 

 branches of which, in the present species, are respectively 

 2 and 3 -jointed. 



Both branches of the first pair of swimming feet (fig. 8) 

 are 3-jointed ; the inner branch of pairs 2, 3, and 4 

 (fig. 9) are 2-jointed, all bearing densely plumose setae. 

 Fifth pair in the female (PI. VII., fig. 1) are simple, 

 2-jointed, similar to those of C. gracilis, but without any 

 dentation at the apex. In the male (PL VII., fig. 2) the 

 5th pair is strongly hooked and prehensile. 



Abdomen 3-jointed in the female and 5 in the male (fig. 



