Circulation of Body Fluids 



575 



218. Zawarzin, a., Ztschr. wiss. Zool. 97:481-510 (1911). Histology of heart of 

 dragonfly nymphs. 



219. ZooND, A., and Slome, D., /. Exper. Biol. 6:87-95 (1929). Ions on hearts, 

 Palinurus, Octopus. 



220. ZucKERKANDL, E., Mastct's thesis, Univ. 111. (1948), also Biol. Bull 98:161-173 

 (1950). Blood pressure in some marine animals. 



