1 
K. 
A. ANDREWS 
LITERATURE CITED 
AnprReEws, E. A. 1906 The annulus ventralis. Pro 
1908 
1908 
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1910 
1904 
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doxus. Proce. Wash. Acad. Sci. vol. 10. 
Breeding habits of crayfish. Am. Nat. vol. 38 
Conjugation in the crayfish Cambarus affinis. 
Crayfish spermatozoa. 
c. Boston Soe. Nat. Hist., 
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Jour. Exp. Zool. vol. 9. 
Anatom. Anz. vol. 25. 
