THE MAMMOTH CAVE. 97 



imbedded in the adipose tissue of the orbit, and 

 measuring a little less than one-seventy-eighth 

 of an inch.* 



" Through the kindness of Mr. Charles Dean, 

 of Cambridge, and of Professor Agassiz, I have 

 .had placed at my disposal some specimens of 

 Amblyopsis, well preserved in alcohol, and have 

 been able to make, in some respects, a more 

 comj)lete description than has yet been given. 

 I have also had an opportunity of inspecting, 

 superficially, fourteen specimens, varying from 

 one inch and a half, to four inches and a half 

 in length, but in three or four only could the 

 eyes be detected through the skin. In the three 

 specimens recently dissected, the eyes were ex- 

 posed only after the removal of the skin and 

 the careful separation from them of the loose 

 areolar tissue which fills the orbit. In a fish 

 four inches in length, the eyes measured one- 

 sixteenth of an inch in their long diameter, 

 were of an oval form, and black. A filament 

 of nerve [the professor here refers to a diagram 

 of the eye, which accompanies his paper] was 

 distinctly traced from the globe to the cranial 

 walls ; but the condition of the contents of the 



* New York Medical Times, vol. ii. page 354. 

 9 



