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Show 1873.] AUSTRALIA AND THE SOLOMON ISLANDS. 149 fringe ; aperture obliquely roundly lunate, angled at the periphery margins simple, thin, inserted at the carinated periphery, columellar margin triangularly dilated at its insertion, half covering the umbilicus. Diam., greatest 1*17, least 1*08 ; height 0*80 of an inch. Hab. On a mountain, Lord Howe's Island. In m y own collection. HELIX YATALAENSIS, sp. nov. (Plate XVI. figs. 3 a, 3 b.) Shell with a moderately large open umbilicus, depressedly orbicular, rather solid, obsoletely striated, coarsely granular above, pale chestnut below, ornamented around the umbilicus with a broad chestnut ring ; spire slightly raised ; whorls 5| to 6, convex, gradually increasing in size, rounded at the periphery, obsoletely carinated ; aperture lunately ovate, oblique; peristome pink, narrow, slightly thickened, ex~ panded, and very slightly reflected in front at the insertion ; columellar margin triangularly dilated, overhanging the umbilicus. Diam., greatest 0*30, least 0*20; height 0*18 of an inch. Hab. Yatala, Albert river, Queensland. In m y own collection. HELIX SERENA, sp. nov. Shell rather largely and deeply umbilicated, obliquely coarsely striated above, smoother below, pale horny yellow-brown; spire broadly depressed, conical; whorls 7, rounded, very slowly increasing in size, last rather sharply carinated at the periphery ; base very convex; aperture broadly irregularly trapeziform ; lip simple above, thickened and everted below ; columella triangularly dilated ; margins of aperture joined by a thin callus. Diam., greatest 1*00, least 0*80 ; height 0*64 of an inch. Hab. Solomon Islands. In Mr. Hargraves's collection. HELIX FATIGATA, sp. nov. (Plate XVI. figs. 4 a, 4 bi) Shell with a large deep open umbilicus, lenticular, flatly conoidly depressed, obliquely, coarsely striated above, much finer below, of a light yellow-brown colour, lighter at the base ; apex bluntly rounded; whorls 6, flatly obliquely margined and pinched at the suture, last whorl sharply and flatly keeled at the periphery; base shining, excavated round the umbilicus ; aperture broadly angularly lunar; lip simple; margins slightly approximating, lower margin somewhat thickened, columellar margin not dilated, inserted at the margin of the umbilicus. Diam., greatest 0*72, least 0*61 ; height 0*35 of an inch. Hab. Solomon Islands. In m y own collection. HELIX (GEOTROCHUS) GELATA, sp. nov. (Plate XVI. figs. 5 a, ob.) Shell conoidly depressed, rather narrowly umbilicated, of a dark |