278 ANALYTICAL INDEX. 



CHAPTER III. continued. 



Reproduction of defective parts, . PAGE 162 



Perpetuation, . . . . . . 164 



Plates XXXIV., XXXV., XXXVI., XXXVII., explained, 166 



A. 2. CANCER PAGURUS, The Common Crab, . . 167 



This species most familiar when in maturity, . . ib. 



Dimensions depend on subsistence, ... ib. 



The Common Crab the largest and strongest in Scotland, . 168 



Form and organs of Cancer pagurus described, . . ib. 



Fierce and rapacious its food, . . ib. 



Dr Duguid, Kirkwall, ..... ib. 



Extraordinary exuviation lost limbs restored, . . 169 



Death from the immaturity of certain parts at exuviation, 170 

 Limbs of the new animal, while in the original shell, folded across 



its breast, .... ib. 



No one has seen a large Common Crab white, . "..' . 171 

 Shell, though repeatedly regenerated, of the same colour, . 172 

 Specimen, on exuviation, defective of eight limbs, . . ib. 

 Next change the limbs wholly restored, . . . 173 

 New animal and its organs must be concentrated within the origi- 

 nal shell, ...... ib. 



Colour reddish-brown, . . . . . 174 



Permanent symmetry, by successive exuviations, restored from de- 

 defects of four- fifths of its important organs, . . 175 

 Perpetuation, . . . . . 176 



The Crab-fishery neither a lucrative nor favourite employment, 177 



Plates XXXVIIL, XXXIX., XL., XLL, LXX., explained, 178 



3. CANCER (POBTUNUS) LIVIDUS, The Flying Crab, . ib. 



Beautiful and symmetrical animal, decked in lively colours, . 179 



Its organs and form described, ... 180 



Shell stained by various colours, red, blue, and white, . ib. 



Food, ....... ib. 



One of the most prolific of the tribe, . . . .181 



None of the roe productive, . 182 



This animal less contentious than some of the others, . . 183 



Plates XLII., LXX., described, . ib. 



4. CANCER (PORTUNUS) PUSILLUS, The Sand Crab, . ib. 



One of the smaller species its form, colour, &c., . . 184 



Food, 185 



