ACONTIOPHOIUJS. 71 



than broad, and furnished with five long, subequal, 

 terminal setae. Caudal segments about thrice as long 

 as broad, and nearly equal in length to the last two 

 abdominal somites ; terminal setae five, finely plumose, 

 three short and two of moderate length, the longest 

 being more than equal to the length of the abdomen. 

 Length -^th of an inch ('98 mm.). 



This, though nowhere an abundant species, is gene- 

 rally distributed round the British Islands ; the follow- 

 ing are the localities in which it has been observed. 

 Taken in the surface-net at night in Round stone 

 and Westport Bays, and on Laminaria saccharina in 

 Clifden Bay, Ireland; dredged off Portincross, Ayr- 

 shire, and in forty fathoms off St. Agnes (Scilly 

 Islands) ; in thirty to thirty-five fathoms off Robin 

 Hood's Bay, Staiths, and Red Cliff (Yorkshire) ; and 

 in twenty-seven fathoms off Hawthorn (Durham). 



2. ACONTIOPHORUS AEMATUS, 710V. sp. PL LXXXVII, 



figs. 815. 



Ascomyzon ornatum, Brady and Robertson. Brit. Assoc. Report, 

 . p. 197 (1875). 



Anterior antenna (fig. 8) 6-jointed, very slender, 

 densely clothed with fine setae, some of which are 

 plumose; the relative lengths of the joints are as 

 follows : 



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

 7273113222 2 4 4 1| 3 3 



