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Type.—Chicago Natural History Museum No. 106701. Collected in Chutes de la Mort, Madagascar, by E. S. Ross, November 10, 1959.

Remarks.—The affinities of this new form in the super-family of Cyclophoracea are still obscure; despite some similarities with the Cochlostominae, a close relation with the Diplommatinae seems more probable.

Bulimulus (Rhabdotus) fonsecanus, new species. Figure 11, a, b.

Diagnosis.—A medium-sized, rather thin shell, pinkish white, smooth, elongate ovate, covered rimate, with the aperture provided with a thin, reflected lip.

Type.—Chicago Natural History Museum No. 106702. Collected on the Gulf of Fonseca, San Salvador or Nicaragua. Collector unknown; received from the California Academy of Natural Sciences in San Francisco.