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56. Day, E. C, ]. Exper. Zool. 28:307-335 (1919), ihid., 34:45-65 (1921). Relation 

 of central ganglion to heart of ascidian. ^ -, n ,^i i 



57. Derrickson, M. B., and Amberson, W. R., Biol. Bull. 67:329 (1934). Blood 

 volume, lower vertebrates. 



58. DuBuisso^,M., Arch. Biol. 38:9-21(1928). Pressure in Maja circulation. 



59. DuBUissoyi,M., Arch. Internat. Physiol. 40:181-188(1934). Electrocardiograms, 



crab, dogfish, frog. n t i m y.r r^ 



60. Dukes, H. H., The Physiology of Domestic Animals (1942). Ithaca, N. Y., Corn- 

 stock, pp. 132-150. Blood pressure. 



61. DuwEZ, Y., C. R. Soc. Biol. 122:84-87 (1936). Electrocardiogram, Dytiscus. 



62. Edwards, D. J., Am. ]. Physiol. 52:276-283 (1920). Contraction of Limulus 



heart. 



63. EiGER, M., Pfliig. Arch. ges. Physiol. 151:1-51(1913). Analysis of electrocardio- 

 grams. 



64. EssER,W., Arch. Biol. 45:377-390(1934). Histology of Anodonta. 



65. Evans, C. L., Ztschr. Biol. 59:397-414 (1912). Electrocardiogram, Helix. 



66. Federighi, H., ). Exper. Zool. 50:257-294 (1928). Contraction of Rouget type 

 cells in annelid vessels. 



67. FoLGiA, V. C, Proc. Soc. Exper. Biol. & Med. 46:598-601 (1941). Necessity of 

 lymph hearts for survival of toads. 



68. ERioimcQ, U., Arch. Internat. Physiol. 14:126-151(1913). Physiology of heart 

 of Octopus. 



70. Fredericq, H., Arch. Internat. Physiol. 49:299-304 (1939). Nerves and caffein 

 on heart, Aplysia. 



71. Fredericq, H., Bull. Acad. Roy. de Med. de Belg., CI. Sc. 25:611-623 (1939). 

 Nervous regulation of heart, Eledone. 



72. Fredericq. H., Biol. Rev. 22:297-314 (1947). Nervous control and drug effects 

 on molluscan hearts. 



73. Fr^d^ricq, H., and Bacq, Z. M., Arch. Internat. Physiol. 49:490-496 (1939). 

 Effects of visceral nerve on cephalopod heart. 



74. Fredericq, H., and Bacq, Z. M., Arch. Internat. Physiol. 50:169-184 (1940). 

 Acetylcholine and nerves on cephalopod heart. 



75. Freudenstein, K., Ztschr. wiss. Zool. 132:404-475 (1928). Heart and circulation 

 of honeybee. 



76. Fry, H. J. B., /. Physiol. 39:184-216 (1909). Nervous regulation of heart of 

 cephalopods. 



77. ¥Ry,H.K., Quart.]. Exper. Physiol. 7:185-192(1914). Blood volume, frogs and 

 lizards. 



78. FucHS, S., Pflitg. Arch. ges. Physiol. 60:173-204 (1895). Circulatory physiology- 

 in cephalopods. 



79. Gamble, F. W., and Ashworth, J. H., Quart. ). Micr. Sci. 41:1-42 (1898). 

 Anatomv of Arenicola. 



80. Carrey', W. E., /. Cell. & Comp. Physiol. 1:209-223 (1932). Electrocardiogram 

 of Limulus. 



81. Carrey, W. E., Aw. /. PhysioL 136:182-193(1942). AcetylchoHne on Limulus 

 heart ganglion. 



82. GASKEhL,}.E., Phil. Tr. Roy. Soc. Lond.,B. 205:153-210(1914). Pharmacology 

 of blood vessels of leech. 



83. Greene, C. W., Bu/L U. S. Bur. Fish. 24:429-456 (1904). Blood pressure of 

 salmon. 



84. Hamilton, H. L., ). Cell. Or Comp. Physiol. 13:91-104(1939). Drugs on grass- 

 hopper heart (Melanoplus). 



85. Hart, J. S., Proc. Fin. Acad. Sci. 7:221-246 (1944). Blood pressure and cardiac 

 output of fish. 



86. Hecht. S., Am. ;. Physio/. 45:157-187(1918). Heart beat, Ascidia. 



87. Heinbecker, P., Aw. /. P/tvsio/. 117:686-700(1936). Discharge of pacemaker 

 ganglion, Limulus. 



88. Heinbecker, P., and Bishop, G. H., Am. /. Pfiysio/. 114:212-223(1935). Dis- 

 charge of pacemaker, Limulus. 



