THE ENTEROPNEUSTA. 37 



On the 

 Morphology of the Enteropneusta. 



PART II. 



By 



fVilliam Bateson, 91. A., 



Fellow of St. John's College, Cambridge. 



With Plates YII— XII. 



The following paper is descriptive of the figures which 

 illustrate my concluding account of the morphology of the 

 Enteropneusta. 



As an abstract of some of these facts was given with the first 

 part a certain amount of repetition has become unavoidable. 



Since the publication of Part I, I have been able to make 

 some further observations on the histology of the fresh tissues 

 of the Brittany species (B. salmoneus and Robinii). For 

 this opportunity I am indebted to the kindness of the di- 

 rectors of the Zoological Laboratory stationed at Concar- 

 neau, Finistere. And especially my thanks are due to Dr. 

 Chabry for affording me these facilities. 



The Skin and Nervous System. 



The skin of all the species is entirely ciliated. 

 In the fresh condition I have chiefly studied it in B. 



4 



