Report on the zoological collections made in the Indo-Pacific Ocean ...

—MOLLUSC A. 75Euchelus deuigratus, //. Sf A. Adams, Gen. Heo. Moll. i. p. 418,pi. 47. figs. 6-06.Var. = Monodonta sulcifera, A. Adams, Proc. Zool. Sac. 18-)1, p. 175.Yar. minor = Euchelus bruimeus, Adams i^- Angas, MS.? in Mus.Cuminy lij' Angas.Hah. Port Molle and Port Curtis, Queensland {Copinnger).This species varies considerablj' in size and colour. The tj'picalforra, as figured by Philippi, is a small strong shell of a black-browncolour, the spiral gvanulous ridges being articulated with yellowishwhite. The columellar tooth is well developed ; the aperture smalland strongly sulcate within, especially at the base. Another formis considerably larger, having a total length of 25 millim. In thisvariety, which is generally of a lilac-black colour, paler between theridges, the articulation u2)on the latter is less conspicuous, the toothon the columella smaller, the aperture more slightly sulcate, and thewhole structure of the shell proportionally thinner than the typicalform. Monodonta sulcifera is a light-coloured variety, with verylittle articulation or spotting, and of immature growth. Thisaccounts for the words "labro tenui " and "columella ad basin trisulcata' in Adams's diagnosis. The latter feature is not stronglymarked even in the type, and in the adult shell it becomes obliteratedby the deposition of callus and nacre. Euchelus hrunneus,which appears to be a MS. name attached to shells in the Cumingiancollection and to a series presented to the British Museum byMr. G. F. Angas, is a dwarf variety, and with the exception of size(10 millim. in length) agrees in all respects with the normal form.The following is the geographical distribution of the species :Nicobar Islands {Chemnitz); Tonga-Tabou, Vanikoro (Quojf) ;Kingsmill Island, Timor, Plores (Martens) ; New Guinea, FijiIslands (Brit. 3Ius.); N.E. Australia, Torres Straits and PortEssington (large var. in Brit. Mus.) ; Eoebuck Bay, North Australia(var. sulcifera) ; Moreton Bay (Angas) Snd Sydney (Mus. Cuming)for var. brunnea.98. Bankivia (Leiopyrga) picturata. (Plate VI. figs. C-C 2.)Leiopyrga picturata, H. ^ A. Adams, Ann. Sf Mac/. Nat. Hist. 1863,vol. xi. p. 19; Angas, Proc. Zool. Soc. 1865, p. 181, 1867, p. 216.Hah. St. Vincent's Gulf, South Australia (Angas) ; MiddleHarbour, Port Jackson (Angas and Coppinger) ; Stuart Island, NewZealand (G. Traill).This is a very pretty species, presenting variations in colouringvery similar to those of the common E. varians. The form originallydescribed by Adams is whitish, ornamented with fine undulatinglongitudinal red-brown or pinkish lines, which, at the sutures andat the periphery of the last whorl, are darker and assume theappearance of spots.Another variety has the middle of the whorls encircled by a plainnarrow zone, without the scries of spots at the periphery of the last.