NOTES ON SOME PROBLEMS OF ADAPTATION. IOI 



thus indicated is reflected also in connection with tactile irrita- 

 bility (Crozier, '18). 



Summary.- -Ogilbia verrillii, shore-living brotulid and close 

 relative of blind brotulids of Cuban caves, has relatively small 

 eyes and is decidedly photonegative in its behavior. Its skin is 

 sensitive to light, a condition thus far recognized in but one other 

 marine fish; this is taken to be of significance for the conception 

 of preadaptation. 



CITATIONS. 



Crozier, W. J. 



'17 The Photoreceptors of Amphioxus. Anat. Rec., Vol. n, p. 520. 



'18 On Tactile Responses of the De-eyed Hamlet (Epinephelus striatus). 



Jour. Comp. Neurol., Vol. 29, pp. 163-175. 

 Eigenmann, C. H. 



'09 Cave Vertebrates of America: A Study in Degenerative Evolution. Publ- 



Carnegie Instn. Wash., No. 104, ix + 241 pp., 31 pis. 

 Garman, S. 



'oo Additions to the Ichthyological Fauna of the Bermudas, from the Collec- 

 tions of. the Yale Expedition of 1898. Trans. Conn. Acad. Sci., Vol. 10, 

 PP- 510-512. 

 Jordan, H. 



'17 Integumentary Photosensitivity in a Marine Fish, Epinephelus striatus 



Bloch. Amer. Jour. Physiol., Vol. 44, pp. 259-274. 

 Parker, G. H. 



'08 The Sensory Reactions of Amphioxus. Proc. Amer. Acad. Arts and Sci., 



Vol. 43. PP- 413-455- 



'09 The Integumentary Nerves of Fishes as Photoreceptors and their Signifi- 

 cance for the Origin of the Vertebrate Eyes. Amer. Jour. Physiol., Vol. 

 25. PP- 77-8o. 

 Payne, F. 



'07 The Reactions of the Blind Fish, Amblyopsis spelaus, to light. BIOL. BULL., 

 Vol. 13, pp. 3I7-323- 



