672 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



antennae nine-jointed. Second antennae having a hooked unguis attached to a strong 

 basal joint. Mouth-parts e.xtremely small, apparenth^ suctorial. First three pairs of legs 

 unjointed, rounded, tubercular ; fourth pair at the base like the rest, but also carrying 

 two small narrow rami or prolongations. 



This genus makes an approach to Gycnus, Milne-Edwards (Hist. Nat. Crust., vol. 3, 

 p. 495, 1840). That name being preoccupied must give way to Gongericola, van Beneden 

 (Bull. Ac. Roy. Belgique, vol. 21, pt. 2, p. .583, 18.54), which is distinguished from the 

 present genus by having all four pairs of legs two-branched. 



Bassettia congei, n. sp. 



Plate LXX F. 



The first antennae have the first two and the last three joints distinct, the in- 

 termediate part being faintly divided into four small joints. In the second antennae 

 there may be a short basal joint in addition to the long one which carries the unguis. 

 The small oral cavity seems to contain some minute pointed organs. The tubercles 

 representing the second pair of legs are close to the first pair, but are larger and 

 more prominent. The egg-strings attached to the distal corners of the long genital 

 segment are somewhat longer than the animal. 



Length, 3 mm. 



Habitat. Blanche Bay, New Britain, parasitic on gills of Conger. 



The generic name is chosen in compliment to Mr P. W. Bassett-Smith, R. N., whose 

 contributions to our knowledge of parasitic Copepoda are of high value. 



Gen. Pseudocycnus, Heller. 



1868. Pseudocycnus, Heller, Reise der Novara, Crustacea, p. 218. 

 189.9. Pseudocycnus, Bassett-Smith, Proc. Zool. Soc. London, p. 475. 



To this genus only one species has as yet been assigned. 



Pseudocycnus appendiculatus. Heller. 



, 1868. Pseudocycnus appendiculatus, Heller, Reise der Novara, Crustacea, p. 218, 



pi. 22, fig. 7. 



1898. Pseudocycnus appendiculatus, Bassett-Smith, Ann. Nat. Hist., Ser. 7, vol. 2, 

 p. 368. 



1899. Pseudocycnus appendiculatus, Bassett-Smith, Proc. Zool. Soc. London, p. 475. 



So far as could be seen without dissection, the single specimen in the present 

 collection conforms with the accounts given by Heller and Bassett-Smith. The latter 

 writer, however, in 1899, includes in the generic account the character, "caudal ap- 

 pendages ver)' small, simple," whereas Heller says " cauda brevis, appendicibus valde 

 elongatis." The pair of long tapering appendages underneath the egg-sacs are indeed a 

 prominent feature of the species. Heller figures nineteen pairs of indents along the back 

 of the genital segment, the series stopping at some distance from its apex. In the 



