LEAPING OF STROMB (STROMBUs GIGAS LINN.) 209 
vigorous muscular contraction whereby the animal's shell is 
thrown well forward, to the extent even of half the length of 
that structure. 
LITERATURE CITED 
ADAMS, A. 1848 Notes from a journal of research into the natural history of the 
countries visited during the voyage of H. M. S. Samarang. In E. 
Belcher: Narrative of the Voyage of H. M. S. Samarang during the 
years 1843-46, vol. 2, pp. 223-532. 
COPELAND, M. 1919 Locomotion in two species of the gastropod genus Alectrion 
with observations on the behavior of pedal cilia. Biol. Bull., vol. 
37, pp. 126-138. 
PARKER, G. H. 1911 The mechanism of locomotion in gastropods. Jour. 
Morph., vol. 22, pp. 155-170. 
