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Show 48 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Jan. 20, 2. TRICHOTROPIS FIMBRIATA1, Jeffreys. (Plate V. figs. 7, 7a.) S H E L L oblong, thin, semitransparent, nearly lustreless: sculpture, several rows or ridges of fine spiral striae, which are covered by short and close-set bristles of the epidermis ; there are from eight to ten of these rows on the body-whorl, two on the next, and one on each of the two succeeding whorls ; the interstices of these rows as well as the rest of the shell marked lengthwise by very slight and microscopic lines : colour \ ellowish-brown : spire elongated, bluntly crested at the top: "whorls 4-5, convex, somewhat turreted, regularly increasing in growth ; the last equals one half of the spire when the mouth is placed downwards ; the apical whorl is compressed and slightly intorted : suture deep : mouth triangularly oval, about two fifths the length of the spire : outer lip curved, thin-edged, angular and inflected above, expanded at the base, but not notched : inner lip filmy: pillar almost straight: umbilicus none. L. 0-1, B. 0-075. 'Porcupine' Exp. 1869 : St. 16. A single specimen. 3. TRICHOTROPIS DENSISTRIATA2, Jeffreys. (Plate V. figs. 8, 8a.) S H E L L oval, thin, semitransparent, and nearly lustreless: sculpture, numerous rows of exceedingly fine spiral striae, which are covered by minute and close-set prickles; there are from 20 to 25 of these rows on the body-whorl, and from eight to ten on the penultimate whorl : colour pale yellowish-brown : spire short, blunt at the top : whorls 3-4, rather tumid ; the last equals two thirds of the shell with the mouth downwards, or placed in a prone position ; the apical whorl is irregular: suture well marked but not deep : mouth exactly oval, about half the length of the spire: outer lip rounded, thin, angulated above, notched below: inner lip thickened : pillar curved, abruptly terminating in a sharp point at the base, below which is formed the basal notch : umbilicus none. L. 0-085, B. 0-065. * Porcupine' Exp. 1869 : St. 16, 23 a. A single specimen from each station. Distribution. C. Verd I. ('Talisman' Exp.); 1192 fms. This minute species seems from the notched base to connect Trichotropis with Admete. 1. CANCELLARIA VIRIDULA, Fabricius. Tritonium viridulum, Fabr. Fn. Gr. p. 402. Admete viridula, G. O. Sars, Moll. reg. arct. Norv. p. 215, t. 13. f. 1 a, b, 2. 'Lightning' Exp.: St. 1, 3. • Porcupine ' Exp. 1869 : 61, 65. 1870 : Atl. 1, 2. Distribution. Arctic seas in the Atlantic and Pacific, Iceland, Norway, C. Cod northwards, and North Japan ; 2-1255 fms. Fossil. Pliocene: English and Belgian Crags, Iceland. Post- 1 Fringed. 2 Closely striated. |