Abstract
SINCE writing the notice of Dr. Lischke's work which appeared in No. 13 of NATURE, I have received from Dr. Lea of Philadelphia a typical specimen of his genus Hippagus and the volume of his “Contributions to Geology.” For such a valuable communication I would publicly acknowledge my obligation to that veteran conchologist. I was misled by Phihppi and Searles Wood, in considering Hippagus and Verticordia the same genus. Hippagus is closely allied to Crenella, as the latter is represented by C. glandula of Totten and, indeed, I cannot detect any character to distinguish them generically. These agree in shape, sculpture, hinge, muscular impressions and inflexion of the beaks. The genus Verticordia of S. Wood is very different and belongs to another family, viz. that of Lyonsia.
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