REPORT ON THE COPEPODA. 133 



genital ring ; tail unjointed and hidden under the genital ring ; fourth pair of feet small, 

 the basal joint not alseform ; first three pairs of feet rudimentary, consisting only of 

 plumose setse. 



Echthrogaleus qffinis, M. -Edwards. 



A single specimen of this species was found, but the name of the locality has 

 unfortunately been lost. 



Pandarus, Leach. 



Body broadest in front. Cephalothorax four-jointed; first segment very large, second 

 short, and having alseform lateral processes ; third and fourth simple and bilobate. 

 Abdomen two- or three-jointed, rounded behind ; caudal stylets borne on the side of the 

 abdomen, acute, styliform, non-setiferous. Eyes two. Four pairs of swimming feet, all 

 two-branched, the fourth pair rudimentary. Sucking discs two (or three) pairs — two 

 pairs on the sides of the carapace, and one at base of second antenna (Dana). 



1. Pandarus crancliii, Leach (fide Steenstrup and Liitken). 



Pandarus crancliii, Steenstr. and Ltk., Bidrag til Kundskab om det aabne Havs Snyltekrebs og 

 Lernseer, p. 50, Tab. xi. fig. 22. 

 ,, carcliarim (Leach ?), Burmeister, Neuen oder weniger bekannten Schmarotzerkrebse, 

 p. 273, pi. xxv. 

 ? ,, armatus, Heller, Crustacea Novara Exped., p. 202, Tab. xix. fig. 4. 

 ? ,, concinnus, Dana, Crust. U. S. Expl. Exped. (1852), p. 1366, pi. xcv. fig. 1. 



A large number of specimens found parasitic on Carcharias brachyurus, between 

 Papua and Japan, and off the Kermadec Islands. 



The form and proportions of this animal seem to be subject to a good deal of 

 variation, dependent perhaps upon the age of the specimen ; the length and shape of 

 the posterior abdominal segment and caudal stylets are especially variable ; and amongst 

 the Challenger specimens are many which I cannot distinguish from Dana's Pandarus 

 concinnus. These, however, are lighter in colour, without the conspicuous brown or 

 black blotches of the typical form, somewhat smaller (?), and altogether so different in 

 appearance under the low magnifying power of a hand lens, that I at first set them aside 

 as belonging to a distinct species. This, however, I believe to have been an error ; and 

 as Heller's figures of Pandarus armatus very closely agree with the "concinnus" form, 

 I am disposed to think that this also may fairly be taken as a synonym. 



Heller observes that the male of Pandarus armatus is unknown, but that Nogagus 



