2 1-8 THE COMPARATIVE MORPHOLOGY OF THE CRAYFISH. 



extent than those do from one . another. The gills are. 

 i'i fact, reduced to seventeen on each side, in consequence 



FIG. 63. Cambants Clarkil, male (^ nat. size), after Hagen. 

 of the absence of the pleuro-branchia of the last thoracic 

 somite; and there are some other differences to which 

 it is not needful to refer at present. It is convenient to 



