08 BRITISH UOPEPODA. 



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 Algae 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 1-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 antennae small, 7- or 8- jointed; inner branch of 

 posterior antennas 2-jointed. Mandibles well deve- 

 loped; palp 2-branched. Second foot-jaw forming a 

 clawed hand. Maxillae and foot-jaws nearly as in 

 Stenhelia. First pair of swimming-feet short, inner 

 branch rather the longer, 2-jointed, bearing long 

 terminal setae, but no claws ; second, third, and fourth 



