166 BRITISE PARASITIC COPEPODA. 



handled; it also appeared to be somewhat immature, 

 as the appendages of the genital segment were not 

 fully developed; they resembled those of a young 

 female represented by figure 5c on plate xviii of 

 Kroyer's work, 'Bidrag til Kundskab om Snyltekreb- 

 sene ' (1863). Kroyer's specimens of Sphyrion lumpi 

 were found fixed on the tail of a Gyclopterus lumpus 

 from Iceland. 



A species from the southern hemisphere, Sphyrion leevi- 



gatum Gruerin-Meneville. described by G. M. Thomson, New 



Zealand, and also recorded from South African waters 



i/^* by the Rev. T. R. R. Stebbing, exhibits a remarkable 



J K^ difference in the form and dimensions of the cephalothorax, 



\ • 1 which, unlike that of Kroyer's species, is distinctly larger 



v y than the genital segment, while its shape, instead of being 



regular, is more or less distorted. 



The cephalothorax of Sphyrion, like that of Lemsea, 

 Hsemohaphes, and other members of the family Lerneeidas, 

 penetrates, and is wholly enveloped by, the tissues of the 

 host. 

 The nauplius of Sphyrion, as shown by Kroyer, is a free- 

 swimming organism somewhat similar to that of Lemsea 

 hranchialis. 



Dr. Bassett- Smith records, but somewhat doubtfully, the 

 occurrence of Sphyrion lumpi at Dungeness. (Cf. ' A syste- 

 matic Description of Parasitic Copepods found on Fishes/ 

 p. 488.) 



Family vi. Chondracanthidj:.. 



Female. — Body usually more or less incompletely 

 segmented, sometimes furnished with outgrowths in 

 the form of lobes or prolongations, and frequently 

 with the head wholly or partially immersed in the 

 tissues of the host. Antennules short, two- or three- 

 jointed, or rudimentary. AntennaB small and armed 

 with simple but sometimes powerful terminal hooks. 

 Mandibles falciform, expanded at the base, and taper- 

 ing to the distal end, which is usually more or less 

 attenuated and incurved ; furnished with two rows of 

 minute prickles, usually marginal, which extend from 



