188 CRUSTACEANS. 



When observed, I say, the new shell of 8th April was scarcely free , 

 indeed I had reason to doubt whether the animal had sufficient strength 

 for effecting the change. 



The Portunus pusillus is not alike common as many others. It 

 seems to frequent only particular districts. It is preserved with equal 

 facility as any of the rest ; and the observer may be assured of always 

 deriving much amusement from it. 



The intervals of some leading incidents being abbreviated, tends 

 greatly to his convenience. 



PLATE XLIII. 



FIG. 1 . Cancer (Portunus) pusillus, prolific female ; back. 



2. The same, having discharged the roe, and then undergone exuviation, 



now seen in the new shell ; back. 



3. Prolific female ; back. 



4. Breast of the same laden with a profusion of roe. 



5. Cluster of roe approaching maturity. 



6. Cluster of roe in an earlier stage. 



7. Detached capsules. 



8. Young from the ova of figs. 1, 2 ; enlarged. 



9. Young from the roe of another specimen, dorsal spine conspicuous. 



10. Another. 



11. Young specimen, whose shell, on exuviation, subsisted only seventeen 



days. 



PLATE XLIV. 



FIG. 1 . Cancer (Portunus) pusillus, produced on exuviation of Plate XLIII. 

 fig. 2. 



2. Specimen mutilated of both claws, cast shell, producing an entire 



specimen. 



3. The breast of the same, cast shell. 



4. Specimen of unusually dark colour. 



5. Lighter specimen, finely variegated. 



6. Female of uniform colour. 



7. Male of uniform colour. 



8. Mutilated specimen ; back. 



9. The same ; breast. 



