92 BRITISH COPEPODA. 
long-tailed form as a variety :—var. gracilis. This 
species has in all cases occurred in dredgings from 
depths of 20—45 fathoms, and usually amongst muddy 
sand. It has been observed in the following locall- 
ties :— Off the coasts of Durham and Yorkshire, 
amongst the Scilly Islands, and in Westport Bay, 
Ireland. 
2. ChetopEs LoncicaupATa, Brady and Robertson. PI. 
LXXIX, figs, 13—19. 
? Cletodes laticauda, Boeck. Nye Slegter on Arter af Saltvands- 
Copepoder, p. 20 (1872). 
— longicaudatus, B. & R. Brit. Assoc. Report, p. 196 
(1875). 
Female. — Animal slender, elongated; rostrum 
moderately long; caudal segments very long and 
slender, about as long as the last three abdominal 
segments; at the upper fifth of the outer margin is 
affixed a long slender spine (fig. 19), and at the apex 
three setz, two of which are very small, but the 
median one longer than the tail itself. The anterior 
antenne (fig. 14) are 6-jomted, third joint the 
longest, last three short and subequal; ensiform fila- 
ment very stout. Second pair of foot-jaws of mode- 
rate size, with an ovate hand. Inner branch of the 
first pair of feet (fig. 15) larger than the outer, its last 
joint as long as the entire outer branch, cylindrical, 
and bearing two long terminal setz; inner branches 
of second, third, and fourth pairs shorter than the 
outer, the fourth having three, the second and third 
