REVISED REPORT ON L.M.B.C. COPEPODA. 115 



jointed and bears at the apex a small papilla or protuber- 

 ance without any spine or setse. 



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 ver}^ long lateral plumose setae. The third inner joint 

 of the fourth pair has one long and one short terminal 

 spine but no lateral set£e. 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 foui- 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. Each has four 

 terminal setae 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 Gardium edide. Its size, 

 nearly twice that of any hitherto described species of 



