



Mil limeters 



FioDRE 114..— Labial palps. Left— normal position. Right— position taken after mechanical stimulation. Drawn 



from life. Slightly enlarged. 



donta were studied by Cobb (1918), who found 

 that curling can be evoked by a jet of warm water 

 (54° C), a beam of sunhght, faradic current, and 

 by a number of chemicals. His conclusion that 

 chemical stimulation is more effective than are 

 the mechanical stimuli in provoking a response 

 could not be verified. While it is easy to deter- 

 mine the effectiveness of various concentrations of 

 chemicals or to register the response to mechanical 

 stmiuli, a direct comparison between the intensi- 

 ties of chemical vs. mechanical stimulation is im- 

 possible without having a common standard for 

 reference. 



BIBLIOGRAPHY 



Allen, William Ray. 



1914. The food and feeding habilts of freshwater 

 mussels. Biological Bulletin, vol. 27, No. 3, pp. 

 127-141. 

 AwATi, P. R., and H. S. Rai. 



1931. Ostrea cucuUata (the Bombay oyster). The 

 Indian Zoological Memoirs on Indian Animal Types, 

 III, Methodist Publishing House, Lucknow, India, 

 107 pp. 

 Churchill, E. P., Jr., and Sara I. Lewis. 



1924. Food and feeding in fresh-water mussels. 

 Bulletin of the U.S. Bureau of Fisheries, vol. 39, 

 for 1923-1924, pp. 439-471. (Document 963.) 



Cobb, P. H. 



1918. Autonomous responses of the labial palps of 

 Anodonta. Proceedings of the National Academy 

 of Sciences of the United States of America, vol. 

 4, pp. 234-235. 

 CoupiN, H. 



1893. Sur I'elimination des matieres gtrangeres chez 

 les Acephales et, en particular, chez les Pholades. 

 Comptes Rendus Hebdomadaires des Seances de 

 r Academic des Sciences, tome 117, pp. 373-376. 

 Kellog, Jame.s L. 



1915. Ciliary mechanisms of lamellibranchs with 

 descriptions of anatomy. Journal of Morphology, 

 vol. 26, No. 4, pp. 625-701. 

 Leenhardt, He.nry. 



1926. Quelques etudes sur Gryphea angulata. 

 (Hultre du Portugal). Annales de I'lnstitut 

 Occanographique, nouvelle sdrie, tome 3, fascicule 

 1, pp. 1-90. 

 List, Theodor. 



1902. Die Mytiliden. Fauna und Flora des Golfes 

 von Neapel und der AngrenzendenMeeres-Absehnitte 

 herausgegeben von der Zoologischen Station zu 

 Neapel. 27 Monographic. R. Friedliinder und 

 Sohn, Berlin, 312 pp. 

 Matthews, Samuel A. 



1928. The palps of lamellibranchs as autonomous 

 organs. Journal of Experimental Zoology, vol. 

 51, No. 3, pp. 209-258. 

 Nelson, Thurlow C. 



1923. The mechanism of feeding in the oyster. 

 Proceedings of the Society for E.xperimental Biology 

 and Medicine, vol. 21, No. 3, pp. 166-168. 



THE LABIAL PALPS 



119 



