634 NEUROMUSCULAR MECHANISMS IN CHITON 



tive, being notably exerted on "cerebral" nervous structures. Curare 

 is devoid of characteristic action on the neuromuscular responses of 

 Chiton. 



3. The chemical organization of the neuromuscular organs of 

 Chiton, as far as revealed by these tests, corresponds to a more 

 simple condition than is inferred for gastropods. In particular, the 

 behavior with respect to curare resembles more that of the neuro- 

 muscular apparatus of fiatworms. 



BIBLIOGRAPHY. 



Arey, L. B., and Crozier, W. J., 1919, The sensory responses of chiton, J. Exp. 



ZooL, xxix, 157. 

 Crozier, W. J., 1918, On the method of progression in polyclads, Proc. Nat. 



Acad. Sc, iv, 379; 1918-19, On the use of the foot in some moUusks, /. Exp. 



ZooL, xxvii, 359; 1919, On the photic sensitivity of the chitons. Am. Nat., in 



press; 1920, An observation on the cluster formation of the sperms of chiton. 



Am. Nat., in press. 

 Crozier, W. J., and Arey, L. B., 1919, Sensory reactions of Chromodoris zebra, 



J. Exp. ZooL, xxix, 261. 

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Pharm. Exp. Therap., ix, 167; 1918-19, Reversal of reaction by means of 



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 Parker, G. H., 1914, The locomotion of chiton, Contrib. Bermuda Biol. Station, 



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Zool. Jahrb., v suppl. (Fauna Chilensis, ii), 281. 

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Acad., cxlv, 276. 



