LIST OF WOODCUTS. 
Frontispiece. 
Fic. 
1, Astacus fluviatilis, 
2. 
17. 
18. 
—_+—_ 
THE Common CrayFisH, Astacus fluviatilis, (MALE) 
SIDE VIEW OF THE MALE. F 5 
Dorsal VIEWS OF MALE AND FEMALE 
VENTRAL VIEWS OF MALE AND FEMALE 
THE GILLS . P ‘ ‘ e-em 
DIssECTION FROM THE DORSAL SIDE 
(MALE) ‘ ‘ i r a 
LONGITUDINAL VERTICAL SECTION OF 
THE ALIMENTARY CANAL ? 
A GASTROLITH OR ‘‘ CRABS EYE” 
ATTACHMENT OF YOUNG TO SWIM- 
MERET OF MOTHER “ ets 
STRUCTURE OF THE STOMACH . i 
LONGITUDINAL SECTION OF THE 8TO- 
MACH . , é i s 4 
Roor OF THE STOMACH, FROM WITHIN 
DISSECTION FROM THE SIDE (MALE). 
ALIMENTARY CANAL FROM ABOVE , 
BLOOD CORPUSCLES . ; 
TRANSVERSE SECTION OF THORAX .. 
THE HEART i : ; é . 
STRUCTURE OF THE GILLS of 
THE GREEN GLAND . . ‘ ‘ 
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