In the analysis of organismal form, landmark-based geometrical morphom
etrics no iu are preferred to traditional morphometrics by many system
atists. However, certain forms have eluded geometrical morphometric an
alysis because landmarks on them are difficult to define; this situati
on is a problem of logistics rather than an inadequacy of the landmark
-based approach. In this article, a landmark-based geometrical morphom
etric analysis is performed on one such form (the gastropod shell), an
d the results obtained are compared to those obtained using more tradi
tional methods of morphometric analysis.