(1981)
Volume
30
Part
5
Page from
305
European sand-dune pulmonate faunules show considerable variation between species in shape of shell, little during the lifetime of each. Cerion shows much variation in shape during the life-history but comprises in itself nearly all the coastal pulmonate faunule in the Caribbean. Comparison of its various shapes during growth with those of European species suggests that its different life-stages may occupy the niches of different European species.