pinnatus. 



IV. List of Genera and Species common to the Mediterranean and Indian Fauna, excluding the 



' Atlantic. 



To sum up : if we estimate the number of Indian genera of marine fishes at 

 350, and of species at 1200, then over 56 per cent, of the genera and close on 5 

 per cent, of the species are also found in the Atlantic-Mediterranean region. 



This does not include the Cephalochordate forms AmpJdoxus and Asijm- 

 metron. 



Amphioxus occurs in the tropical and temperate parts of the Atlantic, in 

 the Mediterranean, off the Indian . and Ceylon coasts, and in the tropical and 

 temperate parts of the Pacific. 



Asymmetron has only been found (1) in the West Indies and (2) off the 

 south-eastern coast of Papua. In the latter locality a species has recently 

 been discovered by Dr. Arthur Willey, who was at once attracted by the 

 singular fact of geographical distribution thus revealed. 



