ON THE DISTRIBUTION OF THE GENERA. 377 



opposite sides of the isthmus, there <ire none more pertinent in the present 

 inquiry than those of this genus. The two locahties are the Panamic region 

 and the Caribbean Sea. 



Xaiomysiax : — As was the case with a number of the other genera the 

 species of this genus are reported only from widely separated localities. 

 From the Panamic, and in the Arabian Gulf, off the Maldives and off 

 Travancore. 



Chlopsis : — The known locations are the Panamic region and the Medi- 

 terranean Sea. 



Venefica : — A westward Caribbean outlet would accord well with a range 

 which comprises the Panamic to off southern California, off South Carolina, 

 and off the Canaries. 



Serrh'omer : — Similar to Venefica in its beax'ings on the questions before 

 us ; found in the Panamic, Gulf of California, east of Delaware, and off the 

 Azores. 



LahicJdhys : — Like Serrivomer in connection with the theory of a Pana- 

 mic strait, but of wider range. Has been taken in the Panamic, off Alaska, 

 east of New York, off Pernambuco, off the Azores, and off Sierra Leone. 



Nemichlhys : — The comparatively few localities from which species of 

 Nemichthys have been taken are so distributed as to accord well with the 

 theory of a strait at the west end of the Caribbean and also with that of one 

 at the east end of the Mediterranean ; the localities are the Panamic area, 

 Gulf of California, Puget Sound, Alaska, off South Carolina to New England, 

 off the Canaries and Madeira, and in the Bay of Bengal. 



Myxine : — While the genus as a whole appears to agree in the main 

 with the idea of an eastern connection of the Panamic with the Caribbean 

 the great difference in the species on the opposite sides of the isthmus in 

 great measure does away with the value of the testimony ; the evidence is 

 also rendered less important by the presence of Atlantic species in the 

 Straits of Magellan. The list of localities at present includes the Panamic 

 region. Straits of Magellan and vicinage, off North Carolina, off New Eng- 

 land, off Nova Scotia, off the British Isles and northern Europe to Portugal 

 and the Mediterranean, and off Japan. 



