Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor CarilS in Leipzig. 



Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig. 



XIV. Jahrg. 31. August 1891. No. 371. 



Inhalt: I. Wissenschaft!. Mittheilungen. 1. Andrews, On the Eyes of Polychaetae. 2. Graber. 

 Zur Embryologie der Insecten. 3. Zeller, Über den Copulationsact von Salamandra maculosa. 4. Pa- 

 rona, L'Autotomia e la rigenerazione delle appendici dorsali (Phoenicurus) nella Tethys leporina. 5. Be- 

 driaga, Mittheilungen über die Larven der Molche. II. Mittheil, aus Museen, Instituten etc. Vacat. 

 III. Personal-Notizen. Vacat. Litteratnr. p. 217—232. 



I. Wissenschaftliche Mittheilungen. 



1. On the Eyes of Polychaetae. 



A preliminary Communication 1 . 



By E. A. Andrews, Johns Hopkins University. 



eingeg. 9. Juni 1891. 



A study of the eyes in the adults of various Sabellidae, Nereidae, 

 Unicidae, Syllidae. Polynoidae and other families together with some 

 observations upon the formation of eyes both in egg development and 

 in budding has led to the following conclusions. 



The eye is a collection of pigment cells with clear refracting por- 

 tions at the cuticular ends and nerve processes from the inner ends. 

 In the branchial eyes of some sedentary, tubicolous forms these re- 

 tinal cells are isolated by intervening pigment cells and each bears 

 its own refracting medium in its cuticular end. There is thus no fusion 

 of refracting media to form a common lens and the eye may be called 

 »compound« . 



In Hypsicomns each eye has but one such cell, sunk beneath 

 the surface, but connected with the cuticle by an elongated lenticular 

 process about which the adjacent pigment cells are arranged so as to 

 form an approximation to the true «camera « eye of the higher errant 

 Polychaetae. 



1 Two illustrated papers, upon the »Compound Eyes« and upon the »Camera 

 Eyes«, will appear in the V. Vol. of the Journal of Morphology. 



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