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Show 318 ON SHELLS FROM THE LOO CHOO ISLANDS. [Mar. 1, Japan. On the contrary, the shells here described have a smoother aspect and exhibit only the faintest trace of spiral striae. The typical form of H. largillierti, also from the Loo Choo Islands, is considerably smaller, but of about the same proportions ; it has the same number of whojds, a similar umbilicus and angulation at the periphery, and the same very faint spiral striation. A variety is described by Pfeiffer with a single band just above the slight angle of the body-whorl, and falling above the sutural line upon the spire. The two specimens collected by Mr. Pryer have a similar band, and a second situated three or four millimetres below the periphery. Although so large, these specimens are evidently young, being very thin, and having only partially developed the lip of the aperture; the internal thickening described as present in the type is only feebly discernible. 5. HELIX CONNIVENS, Pfeiffer. Of the forty-six specimens of this species obtained by Mr. Pryer, twelve only belong to the unhanded form, the remainder having the single red line at the periphery as figured by Reeve and Pfeiffer. The lip in both varieties may be either white or pinkish. 6. CLAUSILIA VALIDA, Pfeiffer. Not one of the twenty-four examples of this species at hand belongs to the brown-banded variety, all being of a uniform greyish-yellow tint. The largest specimen, consisting of seven whorls, is 33 millimetres in length, or seven longer than the six-whorled shell described by Pfeiffer. All have the spire decollated. 7. CYCLOPHORUS TURGIDUS, Pfeiffer. None of the specimens obtained by Mr. Pryer are as large as the types, also from Loo Choo, described by Pfeiffer; but they agree in every respect with the small form he mentions from the Ibyat, an island of the Bashee group, situated some three hundred miles to the south-west of Loo Choo. They appear to be pretty constant in form, style of colouring, and in the decided peripheral carination; but the peristome varies from white to a reddish tint, and in some specimens it is of a much more duplex character than in others. The operculum is semitransparent, a little concave externally, and consists of seven slowly enlarging whorls which are finely keeled at the suture. C. ibyatensis, Pfeiffer, from the same island as the small variety of C. turgidus, differs only in having the last whorl rounded instead of more or less carinate at the periphery. It should be regarded as a variety of this species rather than as a distinct form. The British Museum possesses quite a typical specimen of C. turgidus, from the island of Formosa, presented by M. Dickson, Esq. 8. CYCLOPHORUS EXALTATUS, Pfeiffer, var. A single specimen only was obtained. It differs from Hong-Kong and Formosan examples in having a slightly larger aperture, and an |