58 BEITISH COPEPODA. 



3. CYOLOPICERA GRACILICAUDA, nov. sp. PI. LXXXIII, 



figs. 110. 



Anterior antennas (fig. 1), slender, 20-jointed, first 

 ten joints much shorter than broad, eighteenth and 

 twentieth joints the longest, being three or four times 

 as long as broad ; the whole limb is sparingly clothed 

 with slender setae on its outer margin ; the posterior 

 antenna (fig. 2) has one slender terminal claw, and a 

 minute secondary branch attached near the middle of 

 its first joint ; the extremity of the mandible is dis- 

 tinctly divided into teeth (fig. 3); fifth foot (fig. 10) 

 composed of two joints, the first of which is small and 

 has a small spine-like process at its distal angle, the 

 second curved, elongated, about five times as long as 

 broad, and bluntly serrated at the apex. Abdomen 

 slender, the first joint elongated ; caudal segments very 

 long and slender, length nearly equalling that of the 

 first two abdominal somites, and ten or twelve times 

 greater than the breadth ; the principal seta is about 

 as long as the abdomen. 



A single specimen of this species was dredged in a 

 depth of thirty-five fathoms off Robin Hood's Bay, 

 Yorkshire. 



