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- W2326522811 abstract "Secondary blinding occurs in one major group of Phacopid Trilobites (Family Phacopidae). Intermediate stages between the normal condition and total blindness show migration of the eyes toward the antero-lateral cephafic margin and reduction of the visual area. The eyes disappear before reaching the cephalic border, but migration of the facial suture continues, in one genus (Ductina) assuming a secondarily hypoparian position. Disappearance of the eye before reaching the cephalic margin agrees with Lalicker's observation that eyes first appear on the dorsal surface of the cephalon. This paper is the result of studies pursued at the Museum of Comparative Zoology, Cambridge, Mass., other results of which have been published previously. The writer wishes to express his gratitude to Professor Percy E. Raymond for his criticism and assistance during preparation of the manuscript." @default.
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- W2326522811 date "1937-11-01" @default.
- W2326522811 modified "2023-09-24" @default.
- W2326522811 title "Secondary Blinding among the Phacopid Trilobites and its Significance" @default.
- W2326522811 cites W3162225099 @default.
- W2326522811 doi "https://doi.org/10.2307/2420609" @default.
- W2326522811 hasPublicationYear "1937" @default.
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