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THE POPULAR SCIENCE MONTHLY. 



lishers to reproduce one of these highly finished engravings represent- 

 ing the most fully developed of the crayfish's limbs (Fig. 1), and some 

 others which give a fair notion of the excellence of the illustrations of 

 Professor Huxley's book. 



To this follows a chapter in which the English crayfish is compared 

 in a variety of points with crayfishes of other lands, such as those of 

 Russia (Fig. 2), of Australia (Fig. 3), and of North America (Fig, 4), 

 with lobsters and prawns, and it is explained how the amount of like- 

 ness and difference between these various but closely similar animals 



Australian Ceatfish (one third natural size). 



may be expressed by the method of classification in groups. Finally, 

 we have a chapter on the geographical distribution of crayfishes, and 

 the facts therein narrated, together with those adduced in the previous 



