FISHES AND FISHING. 111. 



white or colourless, and when the water is clear are 

 easily detected. He says he had not the good fortune 

 to see any (probably because, as it appears, there 

 was a flood at the time he was there). He also saya 

 that an eyeless crawfish, exactly like the common 

 brook crawfish, only perfectly white, is found in 

 these subterraneous waters. 



In " Silliman's American Journal of Science," vol. 

 xvii., 1854, Dr. Wyman gives, at great length, fur 

 ther particulars of these fish, to which he has added 

 observations on their organs of hearing, of which I 

 will endeavour to give the substance. He states that 

 Telkampf, in company with J. Muller, of Berlin, for 

 the first time (as it was asserted), detected rudimen 

 tary eyes, "New York Journal of Medicine," 1845, vol. 

 v. p. 84. Also that Dr. Dekay (see " Fauna of New 

 York") thought that he had detected eyes, covered 

 by the skin; but as the substance of what he con 

 sidered were eyes, had not any of the necessary sepa 

 rate parts to form that organ, and no nerve was con 

 nected with it, there could be no reason to think it 

 was the organ of sight. Dr. John C. Dalton, jun., 

 also thought he had detected eyes, but was, it is 

 believed, mistaken. Professor Owen has described 

 the organ as a simple eye speck, " as in the leech, 

 consisting of a minute tegumentary follicle, coated by 

 dark pigment, which receives the end of a cerebral 



