188 



" Granny " Crabs). If a male, it will probably cast once 

 in two years. 



First Yeah. 



Second Yeah. 



Third Year. 



Fourth Year. Fifth Year. Sixth Year. 



Number of Casting 

 Width in mm. 

 Width in inches ... 



14 

 110-0 



(H) 



Did not cast 



Seventh Year. Eighth Year. Ninth Year- 



Tenth Year. Eleventh Year. Twelfth Year. 



Number of Casting Did not cast 

 Width in mm. 

 Width in inches ... 



Did not cast 



17 



214-7 



(81) 



The approximate calculations given above do not 

 lend support to Williamson's statement that " a crab of 

 four and a quarter inches across would be not less than 

 three years, nor probably more than four years old." 

 Even if we take a growth ratio of one-third, which is 

 rather high, we find that the crab would not reach the 



