G2 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



third, fifth, sixth and seventh joints small, the others of 

 moderate length as shown by the formula : — 



13 . 24 . 7 . 12 . 5 . 6 . 6 . 10 



1 2 3 4 5 6 7 8 

 Antennae well developed, secondary branch three-jointed, 

 second joint very small, terminal joint fully half the 

 length of the basal one and furnished with two setae on 

 its apex, one large and spiniform and one very small ; 

 one seta springs from near the middle of the upper 

 margin of the terminal joint, the basal joint bears one 

 seta on its upper distal angle. Mandibles furnished with 

 several strong and serrated teeth on the biting parts, 

 mandible palp consisting of a basal part carrying two 

 branches, the inner branch which is smaller than the 

 outer is two-jointed, both branches are furnished with a 

 number of setae on the apex and upper margins, the basal 

 part has three terminal plumose setae, and a curved row 

 of short spines on its lateral surface. Maxillae somewhat 

 similar to those of Stenhelia herdmani. Posterior foot- 

 jaws slender and furnished with a short curved claw, 

 basal joints short and furnished with three small plumose 

 setae on the upper distal margin, second joint fully three 

 times longer than broad and bearing a few cilia and one 

 seta on its upper margin, there are also a few spines on 

 its lateral surface. The first four pairs of swimming feet 

 are nearly as in Stenhelia ima, the joints of the outer 

 branches of the first pair are subequal, basal joint of the 

 inner branches nearly as long as the entire outer branch, 

 second joint small and about half the length of the third 

 which is about half the length of the basal joint, the apex 

 of the third joint is furnished with one short stout spine 

 and two plumose setae, one long and one short. Fifth 

 pair of feet large, inner branches broad and triangular, 

 bearing five short plumose setae from the middle of the 



