OCR Text |
Show 186 MR. E. A. SMITH ON MOLLUSCA FROM JAPAN. [Feb. 18, Terebra described by me as granulosa in the Ann. & Mag. Nat. Hist. 1873, vol. xi. p. 268: I propose to call this interesting Japanese form T. pustulosa. 9. PLEUROTOMA FUSCA, var., Hombron & Jacquinot. Pleurotoma fusca, var., Hombron & Jacquinot, Voyage 'au Pole Sud, Zoologie, vol. v. p. lll.pl. 25. figs. 19, 20. Shell fusiform, pale horn-colour, with a white band round the middle of the whorls, brownish at their upper part: whorls 10 ; first three convex, the rest strongly keeled above at the suture; beneath this keel they are concavely sloping, prominently carinated at the middle, the carina being white and bearing small close-set nodules; beneath and above this series of nodules the whorls are ornamented with three or four spiral thread-like lirae and oblique lines of growth; last whorl whitish at the lower extremity, with a brownish somewhat indistinctly defined band around the middle, and encircled with about 15 lirae below the white carina ; mouth and canal occupying rather less than half the entire length of the shell; slit in the labrum small, situated at the termination of the prominent white keel; canal narrow, produced, and a little recurved. Length 17 millims., diam. 5. Hab. Stations 1 and 21. "Torres Straits" (Hombron cy Jacquinot). Although in some respects like the Californian P. gemmata, Hinds, nevertheless, on comparison with that species, the present one appears sufficiently distinct for specific rank. It has a less slender spire and is strongly carinated beneath the suture, whilst P. gemmata is described by Hinds as having two small keels parallel with the suture ; and Reeve (* Conchologia Iconica,' i. sp. 83) refers to these keels as " two very distinct elevated lines." A second, rather deep sinus is situated in the outer lip, about halfway between the suture and the caudal extremity. This character is not referred to by Hombron & Jacquinot; but if the labrum of their single specimen were broken (and this is very possible, judging from the figure of it), of course the slit would not be present. The name fusca has been employed earlier for a species in this family by C. B. Adams; but as that belongs to a different section, I think it unadvisable to alter the name of the present. 10. PLEUROTOMA MARMORATA, Lamarck. • Pleurotoma marmorata, Kiener, Coq. Viv. pi. 6. fig. 11 ; Reeve, Conch. Icon. vol. i. fig. 21; jun.=JP/. hastula, Reeve, I. c. fig. 139. Hab. Station 21. Other localities are :-the Straits of Malacca; Shanghai; Ticao, Philippines ; and Ovalau, Fiji Islands. 11. PLEUROTOMA VERTEBRATA, Smith. (Plate XIX. figs. 6-6 A.) Hab. Stations 21 and 27. The description of this species in the ' Annals and Magazine of Natural History,' 1875, vol. xv. p. 416, was based upon specimens |