III. DISTRIBUTION. 



If the fauna of the Pacific so far as it relates to the Erylidae is cnrnpared with 

 that of other regions, it is .seen that its single genus Eryhis occurs in both. 

 Some of tlie Pacific species are simihir to sj^ecies found outside the Pacific, but 

 not a single one appeal's to l)e really identical with any ultra-Pacific one. 



Eight of the twenty-two knowii sj^ecies, that is 36 %, occur in the Pacific. 



^ The range of the Pacific species is, so far as at [^resent known, not great. 



With the exception of Erylus rotundus and E. sollasii, which ha^•e been obtained 



at various j)oints on the coasts of the Hawaiian Islands, all the Pacific species 



are recorded from one locality only. 



The majority of species, the Pacific as well as those of other regions, are 

 tropical or subtrojiical. It is remarkable that no specimen of Erylus has hitherto 

 been found nn the west coast of the American continent. 



The horizontid distribution of tlie Pacific species is: — 



EaMtrn I'acific Inlands. 



Erylus oxyaster. Galapagos. 



Central Pacifir Islaml.s: 



Erylus monticularis. Funafuti. 



" sollasii. Hawaiian Islands. 



" rotundus. 



" cahculatus. " 



Southeastern Asiatic Islands. 



Erylus decumbens. Java. 



" nobilis. Ternate. 



Xortlieastern Asiaiir Islands. 



Erylus placenta. Japan. 



All the Pacific species have been found in rather shallow water. 



