ECHTHROGALEUS LUTKBNI. 91 



were subsequently obtained at Polperro in Cornwall, 

 but the name of the fish on which they occurred has 

 not been recorded. All these specimens were males. 

 In dealing with this group of fish parasites it is some- 

 times difficult, if males only are available, to determine 

 the species to which the specimens belong ; a careful 

 study, however, of the examples referred to, leaves 

 little doubt that they are the males of an Eckthro- 

 galeus. 



The following is the description of E. liitlteni as 

 given in ' Crustacea of Devon and Cornwall ' : 

 " The cephalosome is much rounded, its breadth 

 much greater than the length ; the hinder corners of 

 the lateral area incurved, well rounded, and reaching 

 backwards to the end of the first of the two exposed 

 segments of the metasome. First segments of meta- 

 some with lateral expansions broader and longer than 

 in the following short segment. The urosome consists 

 of three segments ; the first, or genital segment, is sub- 

 quadrate with slightly arched sides, longer than broad; 

 the second segment very short, the terminal rather 

 broader than long; the uropodal lamina? are as long as 

 the two preceding joints, and of an ovate form. 



" The antennules have the first joint much longer 

 than the second ; the second joint has one spine on 

 the hinder margin. The antennae have the penulti- 

 mate joint stout, the last long and gradually attenuated, 

 only very slightly curved, bearing a single seta on the 

 inner face. The first maxillipeds have the claws 

 setose. The second maxillipeds have the terminal 

 joint very broad and stout, obliquely truncate distally, 

 with a nodule, and areolated disk at the commence- 

 ment of the palm ; the finger short and stout. The 

 first feet have both rami composed of two joints ; the 

 inner branch terminates in three seta?, the outer in 

 four ; the first joint of this outer branch has one spine 

 on the outer margin, and the second joint three. The 

 second, third, and fourth feet are alike in general 

 character, though differing slightly in the number of 



