SPERMATOGENESIS OF AMERICAN CRAYFISH 627 



27. In Cambarus virilis a triniorphism of the spermatozoa 

 exists. Five-, six- and seven-rayed types of spermatozoa are 

 produced. The six-rayed type are the most nmnerous, being 

 about four times as abundant as the other two forms. 



28. In Cambarus immunis a tetramorphism of the spermatozoa 

 exists. Five-, six-, seven- and eight-rayed forms are produced. 

 The six- and seven-rayed spermatozoa are the most abundant 

 types developed. 



BIBLIOGRAPHY 



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497-517. 



1906 Untersuchungen tiber Keimzellen: I. Beobachtungen an den 



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229-428. 

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Akad. d. Wissensch., Berlin, pp. 355-362. 

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La Cellule, tome 2, pp. 83-239. 

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tome 26, pp. 223-422. 

 Grobben, C. 1878 Beitrage zur Kenntniss der mannlichen Geschlechtsorgane 



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Zool. Station in Triest, tome 1, pp. 57-150. 



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 Herrmann, G. 1890 Notes sur la structure et le developpement des spermato- 



zoides chez les Decapodes. Bull. Sc. de la France et de la Belgique, 



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 Keppen, N. 1906 De la spermatogenese chez I'Astacus fluviatilis. Mem. de 



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