90 BKITISH PARASITIC COPEPODA. 



rami lamelliform, broadly ovate, the ends subtrtmcate, 

 scarcely extending beyond the genital segment, and 

 provided with a few apical spinules. Intermediate 

 between the genital segment and abdomen is a small 

 rounded plate concealed in dorsal view. 



Antennules rather slender, not prominent; antennae 

 furnished with strong, hooked, terminal claws. Mouth- 

 tube moderately short and slender. Second maxillipeds 

 short, moderately stout, and furnished with powerful 

 terminal claws. Other mouth-organs as in Dinemoura. 

 Swimming-legs short and biramous ; first and second 

 pairs with both rami two-jointed ; third pair with the 

 outer ramus composed of three and the inner of two 

 joints ; while in the fourth pair both rami consist of a 

 single foliaceous joint. The fifth pair of thoracic legs 

 represented by a small spine-like process on the under 

 side and near the posterior end of the genital lobes. 



Length 11 to 13 mm. Egg-strings long and slender. 



Habitat. Found parasitic on the porbeagle shark, 

 Lamna cornubica. Berwick Bay (Dr. Johnston). 

 Aberdeen Fish-Market and near Fair Island between 

 Orkney and Shetland (T. Scott). From both the por- 

 beagle and the blue shark, Carcharias glaucus, taken 

 at Polperro, Cornwall (A. M. Norman). 



The distribution of this Echthrogaleus is extensive and 

 includes the seas of Europe, the Atlantic and Pacific coasts 

 of North America, and the coast of South Africa. 



2. Echthrogaleus liitkeni (Norman). 

 (Plate XXIX. fig. 1 ; Plate XXX, figs. 1-8.) 



1869. Nogagus liitkeni Norman. Last Rept. on Dredging among the 

 Shetland Isles; Brit. Assoc. Rept. for 1868, p. 300. < 



1906. Echthrogaleus liitkeni Norman & T. Scott. (88) p. 213, pi. xxii, 

 figs. 1-9. 



In the " Last Report on Dredging among the 

 Shetland Isles," the Rev. A. M. Norman records and 

 describes a fish parasite under the name of Nogagus 

 liltlceni. The specimen, which was procured by Dr. 

 Saxby, was found on a skate. Two other specimens 



