562 ON THE NON-PEDUNCULATED HYDATIDS, BY DR. E. FLEISCHL. 



and may occasionally penetrate for some distance into its sub- 

 stance.* The walls of this canal are composed of the follow- 

 ing layers : Most externally is a cylindrical sheath of densely 

 interwoven, but for the most part circularly disposed, con- 

 nective-tissue fibres. To this succeeds a thick layer of loose 

 connective tissue, which forms closely arranged folds projecting 

 strongly towards the lumen of the tube, their apices being 

 almost in contact, and having deep depressions between ; and 

 internal to this is a layer of columnar epithelium, which is 

 probably also ciliated. The analogy of the whole apparatus 

 with those parts of the female generative organs that develop 

 from the upper layer of the germ-epithelium layer is obvious, 

 and the microscopical aspect of transverse sections of the canal 

 just described, and of the Fallopian tube of the female, bear a 

 close resemblance. 



* I have made no mention of this canal in my provisional commu- 

 nication on the " Non-pedunculated Hydatids," (Centralblatt fur die 

 mecL Wissenschaften, 1871, No. 9,) although I was already aware of its 

 existence. Soon after the publication of this communication Herr Prof. 

 Waldeyer was kind enough to forward to me in a letter his views upon 

 'the significance of the organ in question, which he had in the meantime 

 examined. This letter contains inter alia a complete and excellent 

 description of the canal, and a well-founded suggestion of its nature. 



THE END. . 



