roxT?:xTS. 



Tago 



I. InlrodiU'tidii 7 



II. Historical S 



1 1 r. . I.s/ar7(.s- Ifiiiiisciiliis -. I) 



1. Introcluctiou 9 



2. Source of material 9 



3. Care, food, habits, etc., of adults 10 



4. Breeding 11 



•J. I )i'velopinent of eggs 12 



G. Hatching 11 



7. First larval stage: Size; habits; appendages; relation t(.i inotlier; li'lsmi 



thread 16 



5. Second larval stage : Size; habits : appendages '-T 



9. Third larval stage : Size ; habits ; appendages ^il 



10. Fourth larval stage and later stages : Iiate of growth 38 



11. Comparisons with European Astacus -10 



12. Bearing of artificial breeding upon possible acclimatization and economic 



problems and upon geographical distribution 41 



I \'. ( '(iiiihani.<< affinis 11 



1. Introduction ; resume of breeding habits 11 



2. Maternal structure for attachment of j'oung 42 



3. Hatching . .'. 43 



4. First larval stage: Size; appendages; habits; relation to mother: telson 



thread 4-^ 



5. Second larval stage: Size; appendages; habits: relation to mother, anal 



thread 50 



6. Third larval stage : Size ; habits : Iropisms 5r 



7. Fourth and later larval stages: Xuraber of moults and rates of growth ... 63 



8. Eatio of sexes ; se.xual maturity 67 



V. Comparisons and conclusions 69 



5 



