Isthmus Barriers Separating Fish Faunas 263 



the Albatross. In some cases, no doubt, these forms are verging 

 on extinction and a former wide distribution has given place to 

 isolated colonies. 



The following table shows the contents, so far as genera are 

 concerned, of those equatorial areas in which trustworthy cata- 

 logues of species are accessible. It includes only those fishes 

 of stationary habit living in less than 200 fathoms. It goes 

 without saying that considerable latitude must be given to 

 these figures, to allow for errors, omissions, uncertainties, and 

 differences of opinion. 



Distribution of Shore Fishes. — 



.1. Japan and tlie Mediterranean. 



Genera* chiefly confined to these regions 2 



Genera of wide distribution 77 



Total of common genera 79 



Total in both regions 399 



Genera above included, found in all equatorial 



regions 55 



General found in most equatorial regions 11 



Genera more or less restricted 13 



79 



B. Japan and the Red Sea. 



Genera t chiefly confined to these two regions. . 2 

 Genera of wide distribution 109 



Total genera common in 



Total in both regions 424 



* Lepadogaster, Myrus; Lophotes, thus far recorded from Japan, the Medi- 

 terranean, and the Cape of Good Hope, is bassalian and of unknown range. 

 Beryx, Trachichthys, Hoplostethus, etc., are virtually cosmopolitan as well as 

 semi-bassalian. 



t In this group we must place Cepola, Callionymus, Pagrus, Sparus, Beryx, 

 Zeus, all of which have a very wide range in Indian waters. 



X Cryptocentrus, Asterropteryx. The range of neither of these genera of 

 small shore fishes is yet well known. 



