]3o Toiao Kabubaki 



of Jo-no-ike aucl elsewhere : Anguilla mauritiana, Lutianus vaigiensis, 

 Therapon servus, Th. oxyrhynchus, Megalops cyprinoides, and Mugil oeur. 



In the bay of Suruga, the water is very deep close up to the shore, 

 and here has been found a very remarkable oceanic plankton, including 

 siphonophores, heteropods, medusae, and oceanic cephalopods. Sergedes 

 pliosphoreus is of great economic importance, being caught in immense 

 quantities. 



In the bay of Agu, Miye prefecture, there occur an abundance of 

 the pearl-oyster, Margaritifera martensii, and there is formed a large 

 establishment for the cultivation of this which promises to give very 

 good results. 



In tlie Japan Sea the water is by no means simple or isolated, but 

 compound and connected with those of other seas. As may be evident 

 from the account already given, the cold water circulating in the Sea 

 is partly combined with the warm water coming through the Tsushima 

 strait, which water consists, in its turn, of branches of the Kuro-shivvo 

 and the coastal water of the East China Sea, so that the Tsushima 

 stream is a mixed water from three different sources, of which the 

 relative proportions, of course, vary greatly according to different 

 seasons. Thus, the water is not really oceanic but rather coastal and 

 is apparently different in its physical conditions from the Kuro-shiwo 

 on the Facihc side. Accordingly, the Japan Sea, in spite of represent- 

 ing as a whole the zone of mingling, exhibits in its forms of animal 

 life a relatively great variance from the Pacific side, being found to 

 receive migrants from the northern much more tlian from the southern 

 district. 



Instead of passing on to the consideration of the fauna in greater 

 detail, I would here offer some remarks on a few forms. Of fishes the 

 bonitos and Euthynnus are scarcely found in the Sea. Some crabs, like 

 CJdonecetes opilio, etc., are of great commercial value and huge quan- 

 tities are caught. Besides, some shrimps and prawns, belonging to the 

 genera Fdndalus and Crangon, are also found in much abundance. 

 Amongst the cephalopods, one of the most notable is an oegopsid, 

 Watasenia scintillans, which emits luminescence. It appears abund- 

 antly in Toyama bay, about May. Ommastrephes dooMi pacificus is 

 thickly and extensively distributed in the Sea, its thickest distribution 

 roughly coinciding with the extension of the Tsushima stream. 



Southern Zone. — The fauna about Kyushu and Shikoku is less 

 characteristically Japanese^ having much in common with the neigh- 



