627 



10) Nusbaum, J., und Sidoriak, Beiträge zur Kenntnis der Regenerations- 

 vorgänge nach künstlichen Verletzungen bei älteren Bachforellen- 

 embryonen (Salmo Fario L). Archiv für Entwickelungsmechanik der 

 Organismen, Bd. 10, 1900. 



11) J. Hirschler, Badania poröwnawcze nad t. zw strung Leydig a Kos- 

 mos, 1903 (polnisch). [Ueber die sog. LEYDiGsche Chorda der 

 Lepidopteren.] 



Nachdruck verboten. 



Tlie Homology of the Lagena throughout Vertebrates 1 ). 



By H. Spencer Harrison D. Sc. (Lond.), 

 Sherbrooke Scholar of the University of London. 



With 2 Figures. 



In the course of some investigations on the perilymphatic spaces 

 of the ear of Vertebrates, I have had occasion to give much con- 

 sideration to the ontogeny and phylogeny of the pars inferior of the 

 labyrinth. Whilst looking up the literature of the subject, I met 

 with a statement made by von Ebner, in Koelliker's "Handbuch 

 der Gewebelehre des Menschen" 2 ), in which he accepts, apparently 

 without reserve, certain conclusions of G. Alexander (1). As these 

 conclusions are in opposition to l an homology which for many years 

 has been regarded as unassailable, and as my own observations most 

 unmistakably support the orthodox view, it seems worth while to 

 enter a protest before Dr. Alexander's heresy has obtained a wider 

 circulation. 



The point at issue is as to whether that portion of the mem- 

 branous auditory labyrinth which is described as the "lagena" or 

 "lagena cochleae", from fishes to mammals, is the same structure 

 throughout the series. Since the investigations of Hasse (2), Retzius 

 (3), and Kuhn (4, 5), it has been looked upon as a structure which 

 first appears in the Fishes, and persists in Amphibians, Reptiles, Birds 

 and Mammals, though in the latter group without a sensory area. It 

 is first found in close association with the sacculus — the sensory 

 areas of the two being continuous in certain fishes and the lagena 



1) From the Anatomisches Institut, Freiburg i. B. I wish here to 

 express my heartiest thanks to Prof. Wiedersheim for his kindness in 

 giving me a table in the Institut, and to Prof. Gaupp for the use of 

 numerous models and series of sections. 



2) 6. Aufl., Bd. 3, 2. Hälfte. 



40* 



