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Show 28 ZOOLOGICAL COLLECTIONS MADE DURING [J LACHESIS MERIDIONALIS, sp. n. (Plate IV. fig. 3.) Shell small, whitish, cancellated, turreted. Whorls 6 ; two apical verv large, smooth, convex; the rest also convex, longitudinally ribbed and transversely lirate. Costae subequal to the interstices, about thirteen on a whorl, finer at the upper end than beneath, where they become almost obsolete. Spiral lira3 four in number-one around the lower part of the whorls, bordering the narrow deep suture, and scarcely at all affected by the longitudinal costse ; the three others, of which the two lower are much the more conspicuous and coarsely tuberculous upon the ribs, are situated upon the convex portion of the volutions. Last whorl considerably contracted below the middle, encircled by nine transverse ridges, whereof the four upper correspond to those upon the other whorls, the five lower being simple, non-tuberculous, and finer. Aperture small. Columella obliquely arcuate, roundly subtruncate at the base. Canal short, oblique, feebly recurved. Length 4^ millims., diam. 1|, aperture 1 \ long. Hab. Boija Bay, Straits of Magellan, 20 fathoms, on a bottom composed of dead shells and stones. This species is remarkable for the large smooth nuclear whorls, the convexity and coarse cancellation of those which follow, its narrow form, and the small size of the aperture; the increase in the width of the volutions is very gradual. TROPHON GEVERSIANUS, Pallas. Hab. Stations 6 and 7• One specimen from Elizabeth Island is very interesting, as showing the great variation to which this species is subject. It is nearly smooth, displaying no indication of cancellation, and exhibiting only faint transverse grooving. TROPHON LACINIATUS, Martyn. Hab. Stations 1, 2, 7 ; also Cockle Cove, 2-32 fathoms. TROPHON CRISPUS, Couthouy. Hab. Station 7 and Puerto Bueno, 2-7 fathoms, rocky bottom. TROPHON MURICIFORMIS, King. Hab. Stations 2, 3, and 7 ; also Puerto Bueno, 2-7 fathoms, bottom rocky. This species has been described under the names Fusus liratus, Couthouy, F. corrugatus, Reeve, and F. albidus, Philippi; all of these, however, are subsequent to King's description in the ' Zoological Journal' for 1830. TROPHON FIMBRIATUS, Hupe. (Plate IV. fig. 4.) Fusus fimbriatus, Hupe, Gay's Hist, de Chile, vol. viii. p. 165, Atlas, pi. 4. figs. 7-7 b. Shell fusiform, white. Whorls probably about 8, obliquely sloping above, and rounded somewhat at the lower part, longitu- |