A EEVISION OF THE BRANCHIOSTOMID^. 303 



A Revision of the Genera and Species of the 

 Branchiostomidse. 



By 



J. "W, Kirkaldy. 



(From the Laboratory of the Linacre Professor, Oxford.) 



With Plates 34 and 35. 



The opportunity of examining a number of species allied to 

 the well-known Cephalochordate Amphioxus lanceolatus 

 was afforded to me by Professor Lankester, who had for some 

 time collected material for the purpose of revising the genus, 

 and suggested that I should go over the specimens in his pos- 

 session, and prepare a series of drawings showing the chief 

 characteristics of the species. The drawings have been executed 

 by Mr. Bayzand from rough ones prepared by me.^ 



The material examined by me is as follows : 



1. Various collections from the Zoological Station, Naples 

 (A. lanceolatus). 



2. Eight specimens from Ostend sent to Professor Lankester 

 by Professor van Beneden of Liege (A. lanceolatus). 



3. A collection of about one hundred and fifty specimens 

 from the South Australian coast, presented to the Oxford 

 Museum by Professor Baldwin Spencer of Melbourne, Victoria 

 (H. Bassanum). 



4. A collection of about ninety specimens from Torres 

 Straits, lent to Professor Lankester by Professor Haddon of 

 Dublin, by whom they were collected (H. cultellum). 



' The present memoir must be taken as superseding a note published by 

 me in the ' Reports of the British Association,' 1894, Oxford meeting. 



