208 G. H. PARKER 



LITERATURE CITED 



Parker, G. H. 1911. The mechanism of locomotion in Gastropods. Jour. 



Morph., vol. 22, pp. 155-170. 



1917 a Pedal locomotion in Actinians. Jour. Exper. Zool., vol. 22, 



pp. 111-124. 



1917 b The pedal locomotion of the sea-hare Alpysia californica. 



Jour. Exper. Zool., vol. 24, pp. 139-145. 

 Vles,IF. 1907 Sur les ondes pedieuses des Mollusques reptateurs. Compt. 



Rend. Acad. Sci., Paris, tome 145, pp. 276-278. 



