2l6 E. C. CASE. 



The straight lagena and the relatively large remnant of the 

 sacculus is also primitive ; a large sacculus occurs in the Amphibia 

 Ecaudata and in some lizards, as Lacerta viridis. The canals are 

 entirely within the otic cavity and do not penetrate any of the 

 adjacent bones. The lagena of the crocodile is quite elongate and 

 the soft structures are said to show something of a twisting, the 

 lagena of these forms is relatively shorter and broader than that 

 of the crocodile but, of course, nothing can be said of the soft 

 parts. The cavity of the inner ear does not exactly reproduce the 

 membranous ear as the soft parts are separated from the wall by 

 the perilymph but the author believes that the figures given 

 represent a very fair approximation to the true form and pro- 

 portions of the membranous ear. 



