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Show 198 MR. E. A. SMITH ON MOLLUSCA FROM JAPAN. [Feb. 18 number, the three apical ones being very much rounded and minutely reticulated by raised lines, oblique in opposite directions. This oblique reticulation is found in Defrancia as limited by Jeffreys (Brit. Conch, iv. p. 361), and also in Daphnella of Hinds. 36. DAPHNELLA FRAGILIS, Reeve, var. Pleurotoma fragilis, Reeve, Con. Icon. sp. 179. Var. = P. lymnceceformis, Rve. Con. Icon. sp. 325. Non P. lymneiformis, Kiener, Coq. Viv. p. 62, pi. 22. fig. 3. Hab. Philippine Is. (Reeve). The Japanese specimen is much smaller than tbe type of this species, having a length of only 10 millims. However, in form and sculpture the differences are but very trifling. Its spire is certainly less acutely conical, and the reticulation of the surface proportionally coarser, in these respects approaching Daphnella interrupts of Pease (Proc. Zool. Soc. 1860, p. 147), a Sandwich-Island form. In truth the gradation from one species to the other is so subtle, that I fail at present to perceive any other differences except of size, stoutness of the spire, and the solidity of the labrum in interupta. 37- MANGILIA ROBUSTICOSTATA. (Plate XIX. fig. 28.) Shell ovately fusiform, light brown, whitish at the base of the body-whorl and labrum. Whorls 6 ; the apical one and half the succeeding forming the nucleus, globose, large, smooth; the rest turreted, angulated at the upper part at a short distance from the suture, beneath the angulation, which is rounded, sloping inward, so that they are much narrower at the lower part than at the angle, obliquely costate, and striated by the incremental lines; costae very thick (12 on the penultimate whorl), subacute at their edge, and almost adjacent to one another at their bases, thinner and at times sublamellar at the upper extremities, and very obliquely flexuous from the angle downwards ; on the last volution they gradually become obsolete below the middle. Aperture small, livid brown within, except near the lip, where it is whitish ; labrum thin at the extreme edge, strengthened exteriorly by the last well-developed costa, which is white with a single livid-brown spot a little below the middle ; sinus scarcely discernible ; columella smooth, slightly oblique, subrectilinear, covered with a thin callosity which unites at the upper extremity with the termination of the labrum ; canal very short. Length 6-3- millims., width 2|. Hab. Japan. This species, like the British M. sept angular is, exhibits but a very small siuuation in the labrum. 38. LACHESIS JAPONICA, A. Adams. (Plate XX. fig. 29.) Lachesis japonica, A. Ad. Ann. & Mag. Nat. Hist. 1869, vol. v. p. 411. Hab. Station 2. "Off Mino-Sima, 63 fms." {A. Ad.). The largest specimen of this species in the Museum is 12 millims. |