Jordan and Hubbs: Fishes from Port Said. 467 



Family PLEURONECTID^. 



Genus Arnoglossus Bleeker. 



This genus, although including species of widely ditYerent types, 

 does not appear to be divisible into smaller groups, owing to the exis- 

 tence of species with characters intermediate between the extremes. 

 The scales vary from large to fine, and the interior dorsal rays may or 

 may not be prolonged. A. japonicns^ stands intermediate in both 

 these characters. The interorbital varies from a sharp naked ridge 

 in A. japonicus and A. laterna through a narrow concave space, as in 

 A. grohmanni, to a rather wide region, as in ^. malhensis.^ These 

 same characters are valuable in defining related genera. 



22. Arnoglossus laterna Walbaum. 



No. 8oi9a-c, C. M. 



Six specimens, of which the largest is 77 mm. long without the 

 caudal, were secured at Port Said. Dorsal rays 84 to 90; anal rays 

 63 to 68; agreeing exactly in fin formula with specimens from Venice 

 and Palermo. From the Italian material and from the descriptions 

 of the species, the Port Said specimens differ in having a shorter, 

 blunter head, the length of which is contained from 3.9 to 4.2 times in 

 the length without the caudal, equal to the depth of the head at verti- 

 cal through rear border of eyes, and equal to the depth of the body 

 below the lateral line. The least depth of the caudal peduncle is 

 contained from 2.0 to 2.2 times in the length of the head; 2.4 in 3 

 specimens from Venice; 2.7 or 2.8 in 2 specimens from Palermo. It 

 may. well be that two species or subspecies of this type inhabit the 

 Mediterranean, but we refrain from separating them on our insufifi- 

 cient material, as further differences are not apparent. 



Family SOLEID.E. 

 Genus Solea Klein. 



23. Solea solea (L.). 

 Seen, not taken. 



Note on Genera Related to Arnoglossus. 



Arnoglossus is typical of a group of flounders which are distinguished 

 from others by the following set of characters: ventral fins unsymmetri- 



^ Hubbs, Proc. U. S. N. M., VoL XLVIII, 1915, p. 454, PI. 25, fig. 2. 

 ^ Regan, Trans. Linn. Soc. London, Ser. 2, Vol. XII, Pt. 3, 1908, p. 235, PI. 26, 

 fig. 2. 



