also on these suborders of the Perciformes. The representatives of three 

 closely related genera are found on Beloniformes--Axine (4 species), Neo- 

 cixine (1 species), and Axinoides (3 species); the first and last genera live 

 also on the Perciformes (Carangidae and ?Triglidae, see page 257 ). Two 

 species of Microcotyle, one species of the close genus Diplasiocotyle, and 

 three species of Metamicrocotyle are discovered on Mugiliformes. One 

 species of Microcotyle is found on Polynemiformes. The consanguinous 

 relations between the four orders of fishes on which Microcotyle are en- 

 countered are apparently sufficiently close. Thus, Suvorov (1948) writes 

 that Beloniformes occupy an intermediate position between Cypriniformes 

 and Mugiliformes. At the same time we know that Cypriniformes 

 are closely related to Mugiiitormes and Polynemiformes. 



Diclidophoridae are known from five orders --Perciformes, 

 Gadiformes, Macruriformes, Pleuronectifornnes, and Tetrodontiformes, 

 For the Perciformes, Diclidophoridae are known among eight families 

 relating to Percoidei (all on the superfamily Percoidae with the exception 

 of three species on Labridae, i.e., on the superfamily Labroidae), and 

 on one family of Cottoidei [ Triglidae--! species --Choricotyle prionoti 

 (MacCallum) see page 262. ] In Gadiformes all species of Diclidophoridae 

 are encountered only on Gadidae, while on Macruriformes --only on the 

 genus Macrurus. Thus, on the one hand hosts from the orders Perciformes, 

 Pleuronectiformes, and Tetrodontiformes (see above), which are related 

 to each other; and on the other the closely related Gadiformes and Macruri- 

 formes (the last two orders until recently were accepted as one) are 

 characteristic for Diclidophoridae. It is very possible that these two 

 groups are also related although more distantly. Thus, Gregory explains 

 the origin of the Gadidae and Macruridae from Perciformes and A. N. p. 276 



Svetovidov, 1948), considers that the latter family is close to Perciformes. 



Capsalidae are encountered on 6 orders of fishes --Perciformes, 

 Selachiiformes, Pleuronectiformes, Tetrodontiformes, Acipenseriformes, 

 and Mugiliformes. First of all the finding of representatives of the family 

 on sharks and skates attracts attention and causes perplexity. There is an 

 indication of the finding of three species on sharks: the first of them, 

 Sprostonia squatinae (MacCallum) (see page 377 ), the second- -Microphyllida 

 antarctica Hughes encountered in Australia, on Mustelus antarcticus. The 

 author writes that the last form was found on two of one hundred sharks 

 examined (Hughes, 1928). As regards the third species, it is probably an 

 error (see page 261 ). Thus, although the findings of Capsalidae on sharks 

 are very rare, nevertheless they do not arouse special doubts as to their 

 authenticity. Cases of Capsalidae parasitizing skate? are also authentic. 

 They are also very rare. Thus, Entobdella diademi Monticelli and E. 

 bumpsii Linton were encountered several times (see page 258). Benedenia 

 pacifica Guberlet was found once (2 samples) on Myliobates californicus 

 (Gill) in Mexico (Guberlet, 1936a, 1936b), and B. macrocolpae Luhe twice 

 (5 samples) on Rhinoptera javanica Mueller and Henley near Ceylon (Lxihe, 



315 



