REVISED REPORT ON L.M.B.C. COPEPODA. 209 
jointed and bears at the apex a small papilla or protuber- 
ance without any spine or sete. 
The first four pairs of swimming feet have both branches 
three jointed. In the outer branch of the first pair (fig. 9) 
the second joint has one and the third joint three spines 
with foliaceous expansions and aculeate edges. The 
spines of the other swimming feet are mostly foliaceous 
but not aculeate. The fourth pair (fig. 10) has two 
foliaceous spines on the third segment of the outer branch, 
being terminated by a long dagger-like spine and having 
five very long lateral plumose setz. The third inner joint 
of the fourth pair has one long and one short terminal 
spine but no lateral sete. The fifth feet (fig. 11) which 
are alike in both sexes are composed of one joint with one 
long and one short terminal spine. 
The abdomen of the male is five jointed, that of the 
female being four jointed. In the male the first joint has 
two leafy pointed folds each terminating posteriorly with 
three short spines. The four terminal joints are nearly 
equal in length and gradually narrower to the extremity. 
The first joint in the female abdomen is broad and rounded 
posteriorly and devoid of spines; the other joints are 
- much the same as those of the male. The caudal segments 
are about eight times as long as broad and equal in length 
to the two last abdominal segments. Hach has four 
terminal sete and one lateral seta at one sixth of the 
distance from the extremity. 
_ About half a dozen specimens of each sex were obtained 
by carefully washing the branchial folds and other parts of 
specimens of Pecten maximus dredged at 20 fathoms near 
Port Erin Bay. I was led to look for this unknown 
Copepod through the similar habitat of Lichomolgus 
agilis, Scott, as parasitic on Cardiwm edule. Its size, 
nearly twice that of any hitherto described species of 
