c -. n: Tti . - -fm 



'WyA 



c/ru: 



7n(I: 7Ti. 



mP :Z 



tsf-M 





OS. 



ht. 



FlG, t6o. — A male crayfish dissected from the dorsal side, after 

 injection of the arteries. 



>.c, ala cordis ; a.g.m., anterior gastric muscle ; ant.a., antennary artery ; c.p.m., 

 cardiopyloric muscle; car. , cardiac ossicle", d.ab.a.^ dorsal abdominal artery; 

 />., part of filter chamber, blue coloured in fresh _ specimens ; jl.m., flexor 

 muscles of abdomen ;, %.a., gastric artery; h.f., hind-gut; ht., heart; />-., 

 liver; mci.nr., muscle of mandible; ofi.a., ophthalmic artery; os., ostium; 

 p.g, w., posterior gastric muscle; /?■?'. proventriculus ("cardiac" division); 

 py., pyloric ossicle ; ts., anterior lobe of testis ; is'., posterior lobe of the same ; 

 v,d. , vas deferens. 



25? 



