ON THE ZOOLOGICAL STATION AT NAPLES. 



347 



once that the relations of the hypophysis to the cerebral vesicle were 

 most emphatically the same as I bad found them in Gioiia. 



In the case of Glavelina the difficulty is not to see the connection of 

 the lumen of the hypophysis with the cerebral vesicle. 



From the observations of Kowalewsky as well as from my own, I 

 think it extremely probable that the opening of the hypophysis into the 

 branchial cavity is really the neuroporus, which is carried inside with the 

 stomodeeal invagination. Further, from a consideration of their respective 

 relations to the cerebral vesicle, I regard the hypophysis of Ascidians and 

 the so-called ' olfactory pit ' of A-niphioxus as homologous structures. 



The reason why the ' olfactory pit ' of Amphioxus does not open into 

 the buccal region of the pharynx is, that the month has been shifted from 

 its primitive relation to the neuroporus by the remarkable forward exten- 

 sion of the notocbord, the special character of which, necessitating a 

 special explanation, was recognised fifty years ago by Kolliker. 



Latterly the larvffi of Amphioxus have turned up in large quantities in 

 the Bay of Naples, and I have been studying the distribution of the 

 cranial nerves and the peripheral ganglion cells by means of the methyl- 

 blue method of Ehrlich, by means of which it is possible to stain the 

 living larvae, especially the nervous tissue. 



In this way also I have been able to control my former observations 

 on the metamorphosis of the larva of Amphioxus. 



I am about to publish a full account of the above researches in the 

 ' Quarterly Jonrnal of Microscopical Science.' 



In conclusion, I beg to express my best thanks to the Committee of 

 the British Association for appointing me to the use of the table at 

 Naples. 



II. A List of Naturalists luho have worlced at the Zoological Station from 

 the end of June 1891 to the end of June 1892. 



