168 Bulletin American Museum of Natural History [Vol. LIII 
Fig. 13. Teeth of Ampullariide. a, Saulea vitrea (Born); inner marginal, 
central, and outer marginal, the last two lying prone, the cusps foreshortened. }, 
Pila congoensis Pilsbry and Bequaert. c, Lanistes procerus langi Pilsbry and Bequaert. 
d, Lanistes graueri Thiele. e, Lanistes nsendweensis (Dupuis and Putzeys), with two 
outer marginals, aninner marginal, and a lateral drawn separately from detached teeth. 
A discussion of the nomenclature and a synopsis of the classification 
of Ampullariide has been published by Dall.t Some revision of his con- 
clusions appear called for. He argues that by ‘‘ Ampullaria ampullacea, 
le cordon bleu,’’? Lamarck intended to indicate Nerita urceus Miller, 
11904, Journ. of Conchology, XI, pp. 50-55. 
