ON THE DlSTErnUTlON OF THE GENERA. 371 



Pacific to Boring Sea, and from Nova Scotia to Davis Straits, to north of" 

 Iceland to Norway and to Finmark. 



Lycodopsis : — Has a range, in present determination, from the Panamic area 

 northward to Cahfornia, Puget Sound, the Aleutian Islands and to Japan. 



Lycodi'S : — Inhabits the Pacific from the Panamic to California and 

 Bering Straits, and the Atlantic from off Cape Cod, Newfoundland, and- 

 Greenland to north of Iceland, Norway, Finmark, and to the Kara Sea ; also 

 found off the Azores, and the Cape Verdes, and in the Straits of Magellan. 

 On the charts the distribution of this genus in a measure suggests extension 

 of range from the Atlantic through the Arctic and Bering Straits into the 

 Pacific and down the western coasts of North America. 



P/iucocceles : — Thus far identified only from two localities, off the Bay 

 of Panama and in Magellan's Straits. 



Lijcodapus : — Now known from the Panamic, Bering Sea, and off 

 California and Lower California. 



Lepophidium : — With a range including the Panamic to California, and 

 the Caribbean and Gulf of Mexico to South Carolina and to Bahia, Lepo- 

 phidium is one of the best supports of the theory of a transistlnnian 

 water-way. 



Mixonus : — The small number of the localities, Panamic, off the mouth 

 of the Amazon, and off the Canaries, in connection with the great depths 

 at which the species are found, raises doubt whether the genns if better 

 known would support the idea of a Panamic connection with the Atlantic 

 as well as the positions of the ascertained localities wonld indicate. 



Dicrohne : — In evidence from the Panamic to Mexico, from the Carib- 

 bean and the Gulf of Mexico to off New York, off the Canaries, in the 

 Arabian Sea and the Bay of Bengal. In its known distribution this is one 

 of the best of the genera to be used in confirmation of the theory of a 

 passage westward from the Caribbean, as also of one eastward from the 

 Mediterranean. 



Porogadus : — This genus occurs in the Panamic, in the Gulf of Cali- 

 fornia, off New York, o^ North Australia and off Borneo. It has not yet 

 been identified from the Caribbean. 



Monomitopus : — Another of the genera most available in discussions of 

 probable mid-Atlantic connections with the Pacific and the Indian Ocean. 

 Eeported from the Panamic, the Caribbean and the Gulf of Mexico, the 

 Canaries, the Azores, the Arabian Sea, and the Bay of Bengal. 



