LEPEOPHTHEIRUS SALMONIS. 73 



from most of the others of the same genus. Males appear to 

 be comparatively scarce. 



6. Lepeophtheirus pollachii Bassett-Smith. 



(Plate XVII, figs. 5, 6; Plate XVIII, figs. 13-15; 

 Plate XL VIII, figs. 4, 5.) 



1896. Lepeophtheirus pollachius Bassett-Smith. (6) p. 12, pi. iv, fig. 1. 



1899. Lepeophtheirus pollachii idem. (8) p. 455. 



1900. Lepeophtheirus pollachii T. Scott. (112) p. 153, pi. vi, figs. 9-13. 

 1905. Lepeophtheirus inom hiatus C. B. Wilson. (145) p. 656, pi. 



xxviii, figs. 345-352. 



Female.- — Carapace oval, rather longer than broad, 

 and equal to rather more than a third of the entire 

 length of the animal, lateral margins slightly arcuate. 

 Frontal plates not very prominent. Free thoracic seg- 

 ment small. Genital segment subquadr angular, length 

 about a fourth less than the width at the proximal 

 end, and a third less than the length and width of the 

 carapace ; widest posteriorly ; the lateral margins 

 nearly straight and the postero-lateral corner sub- 

 angular. Abdomen fully as long as the genital seg- 

 ment, and indistinctly biarticulated, the end joint being 

 rather narrower than the other. Caudal rami very small. 



Antennules of moderate size. Antennas with toler- 

 ably elongated, strong and abruptly hooked terminal 

 claws. Second maxillipeds moderately short and robust, 

 terminal claw stout and strongly curved. Sternal 

 fork small, rami divergent, and bluntly rounded at the 

 rips. Fourth pair of thoracic legs not reaching to the 

 end of the genital segment; ramus somewhat slender 

 and consisting of three subequal joints; the first and 

 second joints each provided with a small spine on the 

 outer distal angle, but the spine on the first joint 

 sometimes wanting ; the end joint furnished with three 

 S] uniform apical seta3 of unequal length, the innermost 

 being the longest. The entire length of the specimen 

 represented by the drawing on PL XVII, fig. 5, is 

 8 mm. Egg-strings long and slender. 



Male. — The carapace of the male is equal to half the 

 entire length of the animal. r I ne genital segment is of 



