138 PHYSIOLOGY OF THE INVERTEBRATA. 



The blood of a large female lobster (bled by making a cut 

 in the claws) weighed 26.49 gi'ammes. This blood was dried 

 at a moderate heat in a covered crucible ; then heated to 

 complete carbonisation. The porous carbon was exhausted 

 with warm water. The filtered solution was evaporated to 

 dryness, the residue allowed to cool in a dessicator, and 

 weighed with the usual care. The 26.49 gvaoinies of blood 

 yielded 0.8055 gramme of soluble salts, equal to 3.040 

 per cent. 



23.01 grammes of the blood of the crabs (Carcimis mcenas) 

 of RoscofF yielded 0.708 gramme of soluble salts, equal to 

 3.07 per cent. 



The crabs (6'. mcenas) of Roscoff living in sea water of a 

 density of 1.026 were also examined; 14.78 grammes of the 

 blood of these animals yielded 0.445 gramme of soluble salts, 

 equal to 3.001 per cent. 



The hermit crab {Flatycarcinus pagurus) of Roscoff, whose 

 blood had a density of 1.037, was examined by Fredericq ; 

 13.54 grammes of this blood yielded 0.4 1 9 gramme of soluble 

 salts or equal to 3.101 per cent. In the case of another 

 hermit crab the blood had a density of 1.036, and 31.08 

 grammes of it yielded 0.965 gramme of soluble salts, 

 equal to 3. 104 per cent. 



In the case of the sea crayfish {Pcdinurus vulgaris) of 

 Roscoff, 22.94 grammes of blood yielded 0.666 grammes of 

 soluble salts, equal to 2.9 per cent. 



In the case of Maja squinado of Roscoff, 15.60 grammes 

 of blood yielded 0.476 gramme of soluble salts, equal to 

 3.045 per cent. 



The sea water of RoscofF in which the above Crustaceans 

 lived was also analysed with the following results : — 27.312 

 grammes of sea water yielded on evaporation 0.929 gramme 

 of saline residue which is equal to 3.401 per cent. In 

 another determination 26.266 grammes of the same water 

 yielded 0.894 gramme of saline residue, which is equal to 

 3.407 per cent. 



