CLASSIFICATION OF THE CEPHALOCHOKDA. 297 



Asymmetron bassanum is found only in the Bass Straits, 

 Australia, and round the coast from there as far north as 

 Port Jackson. 



A. hectori is known only from the East coast of the 

 North Island of New Zealand. 



A. cvltellum has been recorded from Torres Straits, 

 North-east Coasts of Australia, Thursday Island, and at 

 Ceylon (Herdman). 



A. maldivense occurs near the Maldives, and at 

 Zanzibar. 



A. cingalense is known only from Ceylon. 



A. lueayanum has the widest distribution of all the 

 species of Asymmetron, being both an Atlantic and an 

 Indo-Pacific form. It was first recorded from the 

 Bahamas, where Andrews, its discoverer, found it in 1893. 

 Then in 1897 Willey found what he thought was a new 

 species of this genus, A. caudatum, in the Louisiade 

 Archipelago and Lifu. As A. caudatum is more likely to 

 be only a variety of A. lueayanum we are justified in 

 extending the distribution of this form to the East Indies. 

 Mr. J. S. Gardiner has still more recently found A. 

 lueayanum round the Maldive Islands, while Mr. Crossland 

 also finds it at Zanzibar. We can quite agree with Dr. 

 Willey when, in describing A. caudatum, he makes the 

 following statement, " that it (^4. caudatum) should be 

 entirely distinct from its relations in the Torres Straits, 

 from whom it is removed by a distance of less than 600 

 miles, and on the other hand closely allied to a species 

 residing in the Bahamas upwards of 8000 miles away on 

 the other side of the American continent, is certainly a 

 noteworthy fact of distribution." Later in his Zoological 

 Results 1 , speaking of the same species, he says, " I was 

 not a little surprised to find a representative of this West 

 i Zool. Results. Part 6. 1902. 



