INVERTEBRATE PHOTORECEPTORS 671 



yet such a digest is needed, since there is no monographic treatment in 

 print. The references cited have all been examined and abstracted. A 

 more complete account of the subject will appear as a book, "Inverte- 

 brate Eyes and Photosensitivity," to be published about 1958. 



In the location of references to which bibliographic citations were 

 incomplete or faulty, very real help was given by Deborah Lawrence 

 Harlow, librarian of the Marine Biological Laboratory at Woods Hole, 

 Mass., by Robert Work in the library of the Museum of Comparative 

 Zoology at Harvard University, and by Foster Palmer in Harvard's 

 Widener Library. We have had the benefit of friendly criticism by 

 H. Keffer Hartline of the Rockefeller Institute for Medical Research. 

 Any errors of omission or interpretation are unintentional but our own. 



Research grants have aided in the library work needed and in allow- 

 ing field study of invertebrates in terms of their use of visual cues under 

 natural conditions. Grateful acknowledgment is due the University of 

 Vermont Agricultural Experiment Station, the University of New Hamp- 

 shire, the Society of the Sigma Xi, and the Cranbrook Institute of Science. 



REFERENCES 



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 Adrian, E. D. (1932) The activity of the optic ganglion of Dytiscus marginalis. 



J. Physiol., 75: 26P-27P. 

 (1937) Synchronized reactions in the optic ganglion of Dytiscus. J. Physiol., 



91:66-89. 

 Alexandrowicz, J. S. (1927) Contribution a I'etude des muscles, des nerfs, et du 



mecanisme de I'accommodation de I'oeil des cephalopodes. Arch. zool. exp. et 



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(1927) Die Raumorientierung der Chloeon-Larve. Z. vergleich. Physiol., 



5: 598-606. 



Andrews, E. A. (1892) Compound eyes of annelids. J. Morphol., 5: 271-299. 

 Apathy, S. v. (1902) Die drei verschiedenen Formen von Lichtzellen bei Hirudineen. 



Verhandl. intern, zool. Kongr. Berlin 1901: 707-728. 

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