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Show 350 DR. GWYN JEFFREYS ON THE MOLLUSCA OF TUE [May 20, stated in ' British Conchology ;' that is O. neglecta of Tiberi, and was misled by observing in the collection of the late M . Petit, at Paris, specimens of the present species under the name of O. vitrea. 16. ODOSTOMIA PR^ELONGA 1, Jeffreys. (Plate XXVI. fig. 6.) S H E L L obelisk-shaped, thin, semitransparent, and very glossy : sculpture none : colour clear white : spire long and elegantly tapering ; apex or nucleus rather blunt: whorls 10, more or less compressed : suture slight, usually rather oblique: mouth squarish-oval, somewhat inflected above and curved below: outer lip thin and flexuous, smooth within : inner lip so filmy as to be scarcely perceptible: umbilicus none : tooth small but distinct. L. 0*275. B. 0*075. 'Porcupine' Exp. 1870: Atl. St. 13, 17a, 24,27-30,32-34, 36 ; Med. 50, 55, Adventure Bank. Many specimens of various sizes; those from the Mediterranean are much smaller and more slender. From the Adventure Bank Station I have an imperfect specimen and some fragments of apparently another species allied to the present. It has a thick shell with an angular periphery and a straight pillar, a slighter and straighter suture, and a smaller tooth. If more specimens should be found this may be named concinna. Distribution. Bay of Biscay ('Travailleur' Exp. 1880 and 1881), Coralline zone, Sciaccha (Monterosato), Algiers (Joly), E. Mediterranean (ATares), off West coast of Africa (' Talisman' Exp. 1883) ; 20-733 fms. I noticed this species in the Reports of the British Association for 1873, p. 112. If it were not for the conspicuous tooth, it would certainly be placed in the so-called genus Eulimella. 17. ODOSTOMIA CRASSA2, Jeffreys. (Plate XXVI. fig. 7.) S H E L L cylindrical, remarkably thick and strong, opaque, and glossy : sculpture none, except microscopic lines of growth and the grooves with the outer lip hereafter mentioned, as well as the periphery being slightly angulated : colour ivory-white : spire long and finely tapering: whorls 5 only in the fragments now described, although there would be from 8 to 10 in perfect specimens; they gradually increase in size and are flattened: suture slight, rounded below : outer lip incrassated, furnished inside with 8 to 10 spiral striae or flutings, like those in O. conoidea, O. tenuis, and O. conspicua, as also in O. costaria and other Crag species : inner lip forming an unusually thick and broad glaze on tbe pillar: umbilicus none: too th large, solid, prominent, and winding round the pillar. Largest fragment L. 0*25, B. 0*085. 'Porcupine' Exp. 1870: Atl. St. 3, 6, 9,26; Med. Adventure Bank. Many characteristic fragments of as many specimens of this curious species. Its general aspect reminds one of O. scilla ; but the strong tooth and the inside fluting of the outer lip at once serve to distinguish the two species. 1 Very long. 2 Thick. |