30 BRITISH COPEPODA. 
about one specimen having been seen in each case. 
The localities are as follows :—Off Portincross (Ayr- 
shire) fifteen fathoms; off Sunderland and Seaham 
(Durham) twenty-five to forty-five fathoms ; off Staiths 
(Yorkshire); and on roots of Algz at Roundstone 
(Ireland). 
This species is perplexingly near in many characters 
to Stenhelia ima, but is separated by the characters of 
the first antenna, the l-jointed branch of the second 
antenna, and the outline of the fifth pair of feet. 
Boeck characterises the mandible-palp as 1-jointed, 
but in my specimens the 2-branched character is 
perfectly evident. Nevertheless the difficulty of dis- 
tinguishing between this and Stenhelia ima is great, 
and, without dissection, insuperable. Indeed, I can 
scarcely resist the impression that the two forms may 
be varieties, or stages of development, of one and the 
same species. 
Genus 11. JONESIELLA, nov. gen. 
Body slender, of nearly equal thickness throughout. 
Abdomen not flexed on the thorax after death. An- 
terior antennz small, 7- or 8-jomted; inner branch of 
posterior antenne: 2-jointed. Mandibles well deve- 
loped; palp 2-branched. Second foot-jaw forming a 
clawed hand. Maxille and foot-jaws nearly as in 
Stenhelia. First pair of swimming-feet short, inner 
branch rather the longer, 2-jomted, bearing long 
terminal setz, but no claws; second, third, and fourth 
