233] 45 



visses, les omars, les crabes, etc., et entre autre sur 

 celles de leurs jambes et de leurs ecailles. Mem. de I'Acad. 

 Roy. des Sci., 1712. 



Steele, M. I., 



'02 The Crayfish of Missouri. Publications of the Univ. of 

 Cincinnati, Bull. X, 1902. 



EXPLANATION OF PLATES 



Reference Letters: 



PLATE I 



I, 2, 3, and 4. Preliminary stages in regeneration of new chela. 



Smooth stump before regeneration appears externally. 



First appearance of bud. 



Constrictions marking segments have appeared. 



Rudiments of the entire regenerated structure laid down. 



Regeneration that has taken place within the old stump, be- 

 hind the cuticle stretched across the wounded surface, a, the 



old stump; b, the regenerated portion. 



Same as 3 in Fig. 9, after removal of an investing membrane. 



Section through regenerated structure shown in Figs. 9 and 10. 

 Fig. 14 and 15. Regenerating 6th abdominal appendage before and 



after a moult respectively. 

 Figs. 16 and 17. Regenerating telson, dorsal and ventral views. 

 Fig. 18. Regenerating flagellum of right antenna, dorsal view. 



