156 A LIST OF THE PARASITIC COPEPODA 



1875. Claus, C, Neue Beitrdge zur henntniss der parasitischer Cope- 



podcn, ncbst hemcrkungcn uber das System, derselben, tome 



cit. pp. 327-360. 

 1877. Kurz, W., Studien iiher die Familic der Lernccopodiden,. Zeit 



wiss Zool. vol. xxix. pp. 380-428. 

 1877. Vogt, C, Becherchcs Cotidrcs, Arch. Zool. Exper. vol. vi, pp. 



385-456. 



The system of classification here adopted is that of Gerstcecker, 

 which is founded largely on the minute anatomy of the animals, and 

 is the most recent. 



CALIGID^. 



Caligus, Muller. 



Second and third pair of thoracic legs bifid ; each branch with two 

 joints, first and fourth not bifid. Fourth pair with elongated basal 

 joint; cephalothorax not deeply notched in the centre, frontal lobe 

 bearing a sucking disc near the base. 



a. Abdomen long. 



1. Caligus rapax, Milne Edivards. This species was taken in abun- 

 dance on the surface of the scales of sea trout, Salmo tridta (with 

 Lepeophtlieirus stromii), in the mouth of cod, Gadtts morrhua, and rarely 

 on the surface of grey mullet, Mugil capita. Male generally found 

 accompanying the female, but in smaller numbers. 



2. Caligus diaphanus, Nordmann and Kroyer (not Baird). Found 

 in quantity on the inner surface of the operculum of 2Vigla hirundo 

 and T. cucidus. This species is very small, but agrees exactly with 

 Kroyer's description and plate. 



3. Caligus scomberi, n. sp* I have been unable to place this with 

 any recorded species, and have therefore named it after the fish it is 

 taken from. It is found on the inner surface of the operculum of 

 Scomber scomber. It much resembles the last, but the carapace is oval 

 instead of being rounded, and the abdomen is much longer. 



4. Caligus elegans (?), Van Beneden. A doubtful specimen from the 

 mouth of Gadus morrhuce. 



5. Caligus ( Sciosnophillus) tenuis, Van Beneden. Found on the inside 

 of the operculum of Scicena umbra. Four specimens were found, on 

 the only fish of the kind examined, and were unmistakeable. 



b. Abdomen short. 



6. Caligus minimus, Nordmann. A number of specimens of both 

 sexes were taken from the gill cavity and mouth of the bass, Labrax 



* A liescriptioD, with figures, of this and the other new species mentioned in this paper, 

 at present in manuscript, will be published shortly elsewhere. 



