CALIGUS GURNAEDI. 53 



Male. The male is somewhat similar to the female 

 in general appearance but the genital segment is much 

 smaller, its width being scarcely a third of the width 

 of the carapace ; the segment is also not much longer 

 than broad. The abdomen is composed of two joints, 

 and the end joint is much shorter than the proximal 

 one. The cephalothoracic appendages appear to be 

 similar to those of the female except that the second 

 maxillipeds are rather stronger, and the fourth pair of 

 thoracic legs of proportionally greater length. 



Habitat. Parasitic on Trigla spp., usually lodged in 

 the gill-cavity. Found at Falmouth in 1884 (A. M. 

 Norman). Plymouth on Trigla cuculux (Bassett- Smith). 

 Kroyer obtained this species on Trigla gurnardm. 



We have not seen this species, hut it appears to have an 

 extensive distribution ; besides being recorded from the 

 Norwegian and British seas, 0. B. Wilson mentions its occur- 

 rence on fishes captured on the coast of California, viz. on a 

 king salmon taken at Monterey and on an elephant fish at 

 La Tolla * 



6. Caligus labracis T. Scott. 

 (Plate V, figs. 4, 5; Plate XVIII, figs. 4, 5.) 



1902. Caligus labracis T. Scott. (114) p. 291, pi. xiii, figs. 26-29. 

 1904. Caligus labracis A. Scott. (109) p. 38. 



Female. Carapace suborbicular, length and width 

 about equal, lateral margins evenly rounded, frontal 

 plates large, lunulas prominent. Free thoracic segment 

 subquadrangular, considerably shorter than the cara- 

 pace, and a little more than one fifth of the total 

 length; the width of the segment exceeding the length 

 by about one fourth. Abdomen short, uniarticulate, 

 and about one half as long as the genital segment. 

 Caudal rami very short. 



Antennules short. Mouth-appendages somewhat 

 similar to those of Caligus diaplianus Nordmann. 

 Sternal fork stout, with tolerably broad and slightly 



* ' North American parasitic Copepods : A list of those found upon the 

 fishes of the Pacific coast/ etc. ' Proc. U. S. National Museum/ vol. xxxv, 

 p. 439 (1908). 



