314 
HISTORY OF BRITISH CRUSTACEA. 
Caligus centrodonti, Baird. — Carapace, in the female, 
obovate, narrower in front; frontal plates deeply notched 
in the middle. Thorax much smaller than carapace, last 
joint squareish, lower margin crescentic. Abdomen very 
small, quite concealed by ovarian tubes when filled with 
ova. In the male the carapace is large, the thorax much 
smaller. 
Hab. Bound on the tail and fins of the Pagellus centro- 
doniis , Dublin. 
Gen. 173. LEPEOPHTHEIRU S,* Nordmann. 
Thorax of two distinct joints. Brontal plates without 
small sucking-discs on their under surface. Eourth pair of 
feet slender, of one branch, and serving for walking. 
Lepeophtiieirus Stromii, Baird. (Plate XIX. fig. 2.) 
— Carapace, in the female, oval ; frontal plates not very pro- 
minent ; length of body, about half an inch ; horny tuber- 
cles on hind part of thorax, large and simple. Male much 
smaller than the female. 
Hab. Berwick : on salmon. 
Lepeophtheirus pectoralis, Muller, sp. — Carapace, in 
# From A.67 tos and ( pOeip . 
