26 ALBERT M. REESE. 



short range, the lack of transparency of the surrounding medium 

 making long-range vision impossible, in any case. Although no 

 definite experiments have been made along this line by the writer, 

 it seems probable, from general observations, that Cryptobran- 

 chus is not very keen of sight even at short range. 



The slight development of the ciliary process and the apparent 

 absence of the ciliary muscles make it difficult to see how this 

 animal can have any power of accommodation, since there is 

 nothing that corresponds to the processus falciformis of the 

 teleost eye. It is possible, therefore, that objects are clearly 

 seen only when they are at a certain distance from the eye. 



The unusually large extent of the retina may be a compensa- 

 tion for the slight power of motion possessed by the eye as a 

 whole, so that the image of an object may fall upon a sensitive 

 surface even though the object be without the ordinary line of 

 vision. 



The absence of the vitreous chamber may be correlated with 

 the unusual refractive power of the lens, which makes a further 

 refractive medium unnecessary, and necessitates the shortening 

 of the eye-ball to bring the retinal surface to the focus of the 

 highly- refractive lens. 



SYRACUSE UNIVERSITY, 

 [anuary 28, 1905. 



