TRANSLATOR'S PREFACE. 



DR. HATSCHEK'S investigations respecting the Am- 

 phioxus have hitherto not been accessible to that 

 portion of the scientific world which does not read 

 German. The following Translation has been under- 

 taken in response to a generally expressed wish 

 that this want should be remedied. 



My best thanks for valuable assistance are due to 

 Dr. D'Amnian, of Kew, and Professor Potter, of the 

 College of Science in the University of Durham. 

 The latter kindly undertook to revise the scientific 



terminology. 



J. T. 



UNIVERSITY COLLEGE, 



DURHAM, June, 1893. 



V 



