70 BRITISH COPEPODA. 
Donegal. Female specimens only have been ob- 
served. 
3. LaopHontse THoractca, Boeck. Pl. LXXVII, figs. 1 
—8. 
Laophonte thoracica, Boeck. Oversigt Norges Copepoder, p. 54 
(1863). 
Tetragoniceps longiremis, B. & R. Brit. Assoc. Report, p. 196, 
(1875). 
Female.—Body elongated (fig. 1), subsigmoid when 
seen laterally, posterior dorsal angles distinctly but 
not very strongly prominent, margins denticulated ; 
head united with the first thoracic segment, no ros- 
trum; caudal segments very slender, distant, about 
twice as long as the last abdominal ring; principal 
tail seta rather longer than the abdomen; second 
abdominal segment (fig. 8) produced laterally, the 
angles rounded and densely cillated; third segment 
(fiz. 8) also produced, but angulated and armed with 
two lateral spines ; fourth segment not produced, setose 
at the angle. Anterior antenne (fig. 2) slender, about 
as long as the cephalic segment, 6-jointed, the joints 
having the following proportionate lengths : 
1/2; 9 3 eres 
8 it 8 lie da 
Secondary branch of posterior antenna (fig. 3) very 
small, 4-setose. Second foot-jaw (fig. 4) excessively 
long and slender, the hand almost linear and the 
terminal claw very long. First pair of feet (fig. 5) 
very long, peduncle long, slender, and _ biarticulate ; 
