124 BRITISH PARASITIC COPEPODA. 



The genus and species were both described by P. J. van 

 Beneden in 1853. In the following year G-erstaecker 

 described a closely allied parasite under the name Lonchidium 

 aculeatum. Bassett-Smith in his work 'A. Systematic De- 

 scription of Parasitic Copepoda found on Fishes/ sets aside 

 the generic name given by van Beneden and adopts Ger- 

 staecker ; s Lonchidium. Brian restores van Beneden's name 

 in his work ' Copepodi Parassiti dei Pesci d'ltalia/ and as we 

 have been unable to find any satisfactory reason to support 

 Bassett-Smith in changing the generic name, we have fol- 

 lowed Brian in adhering to van Beneden's name Kroyeria,. 

 Spence Bate used the name Kroyera to distinguish a genus of 

 Amphipoda in 1857, but Sars points out in his ' Crustacea of 

 Norway/ vol. i, that the name had already been appropriated 

 in zoology. Brian apparently regards Gerstaecker's Lon- 

 chidium aculeatum to be nearly identical with Kroyeria 

 lineata. We kept a number of specimens of both sexes alive 

 in sea-water for a time, but were unable to detect them making 

 any attempt to swim. 



Genus 24. CONGERICOLA P. J. van Beneden, 1854. 



Syn. Cycnus M. Edwards (1840), preoccupied by Hiibner for a genus 

 of Lepidopteru. 



Head rounded, small ; free thoracic segments two, 

 without lobes or dorsal plates ; genital segment elon- 

 gated, narrow, and subcylindrical ; abdomen short ; 

 caudal rami setiferous. Antennules composed of about 

 six articulations ; antennae two-jointed and armed with 

 terminal claws. Second maxillipeds slender. Thoracic 

 legs four pairs, all biramose. 



The only British species known to us is that described 

 below. 



1. Congericola pallida P. J. van Beneden. 

 (Plate XLI, fig. 1.) 



1854. Congericola pallida P. J. van Beneden. (14) vol. xxi ? pt. 2, p. 583. 



1861. Congericola pallida idem. (15) p. 148, pi. xxiii. 



1896. Cycnwt pallidus Bassett-Smith. (7) p. 159. 



1900. Cycnus pallidus T. Scott. (112) p. 160. 



1901. CycnuspaltidusA.Scott. (107) p. 350. 



1906. Congericola pallida Norman & T. Scott, (88) p. 215. 



Female. Cephalic segment small and suborbicular. 



