MOI.l.l BOA. ( •) 



Euchelus denigratus, II. Sf A. Adams, Qen. Reo. Mull. i. p. 418, 



pi. 47. figs. 6-66. 

 Var.=Monodonta sulcifera, . I. Adams, Proc. Zool. Soc. 1851, p. 175. 

 Var. minor = Euchelus brunneus, Adams *S~ Angas f MS.f in Mus. 



( him in ij 8f „ tngas. 



Huh. Port Molle and Port Curtis, Queensland (Cojppinger). 



This species varies considerably in size and colour. The typical 

 form, as figured by Philippi, is a small strong shell of a black-brown 

 colour, the spiral granulous ridges being articulated "vith yellowish 

 white. The coluinellar tooth is well developed : the aperture small 

 and strongly sulcate within, especially at the base. Another form 

 is considerably larger, having a total length of 25 millim. In this 

 variety, which is generally of a lilac-black colour, paler between the 

 ridges, the articulation upon the latter is less conspicuous, the tooth 

 on the columella smaller, the aperture more slightly sulcate, and the 

 whole structure of the shell proportionally thinner than the typical 

 form. Monodonta sulcifera is a light-coloured variety, with very 

 little articulation or spotting, and of immature growth. This 

 accounts for the words "labro tenui" and " columella ad basin tri- 

 sulcata " in Adams's diagnosis. The latter feature is not strongly 

 marked even in the type, and in the adult shell it becomes obli- 

 terated by the deposition of callus and nacre. Euchelus brunneus, 

 which appears to be a MS. name attached to shells in the Cumingian 

 collection and to a series presented to the British Museum by 

 Mr. 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, Yanikoro (Quo//); 

 Kingsmill Island, Timor, Flores (Martens) ; New Guinea, Fiji 

 Islands (Brit. Mus.); N.E. Australia, Torres Straits and Port 

 Essington (large var. in Brit. Mus.) ; Roebuck Bay, North Australia 

 (var. sulcifera) ; Moreton Bay (Angas") and Sydney (Mus. Cuming) 

 for var. brunnea. 



98. Bankivia (Leiopyrga) picturata. (Plate VI. figs. C-C 2.) 



Leiopyrga picturata, II. Sf A. Adams, Ann. $ Mag. Nat. Hist. 18G3, 

 vol. xi. p. 19; Angas, Proc. Zool. Soc. 18G5, p. 181, 1867, p. 216. 



Hub. St. Vincent's Gulf, South Australia (Angas) ; Middle 

 Harbour, Port Jackson (Angus and Coppinger); Stuart Island, New 

 Zealand (C. Traill). 



This is a very pretty species, presenting variations in colouring 

 very similar to those of the common E. various. The form originally 

 described by Adams is whitish, ornamented with fine undulating 

 longitudinal red-brown or pinkish lines, which, at the sutures and 

 at the periphery of the last whorl, are darker and assume the 

 appearance of spots. 



Another variety has the middle of the whorls encircled by a plain 

 narrow zone, without the series of spots at the periphery of the last. 



