in the Brain of the Ammoccetc. 



480 



Zoology in the Owens College, I have been able in a striking 

 manner to confirm the results thus obtained in the New Zealand 

 Ammococte by an investigation of the corresponding organs in one of 

 the European species. Professor Hickson kindly placed at my disposal 

 for the purposes of this investigation a series of transverse sections, 

 which had been cut a short while before by his assistant, but which 

 he had not yet examined, and I was delighted to find in these, with- 

 out the slightest difficulty, the structures which I had previously 

 discovered in New Zealand. 



The Owens College Ammoccete was, to judge from the size of the 

 sections, considerably older than the New Zealand specimen, and this 

 possibly accounts for certain differences in the arrangement of the 

 parts under discussion. It appears also to have been treated with 

 osmic acid, while the staining was effected by means of iron Brazilin. 

 The columnar epithelium of the ciliated grooves is perhaps not quite 

 in such a good state of preservation histologically as in the New 

 Zealand specimen, but evidently has much the same character. 

 Beneath the posterior commissure the grooves are widely separated 

 from one another (fig. 4) instead of being in close contact. Anteriorly 

 (fig. 5) they are I think better denned than in the New Zealand 

 specimen, and the left one can be traced a good deal further forwards 



FIG. 4. 



FIG. 5. 



