MOLLTJSCA. 57 



11 fms., and Port MoUe, 14 fms. (Coppinger) ; Palm Island, Cape 

 York, Cape GrenviUe, Darnley Island, &o. (Brazier). 



The two embryonic whork of this pretty species are smooth, 

 glossy, and very convex. The colour of the fresh specimen from 

 Port Curtis is light yellowish brown, with a dark brown band at 

 the upper part of the whorls immediately beneath the suture. The 

 operculum is ovate, rather acuminated below, concentrically striated, 

 with the nucleus near, but not at, the lower extremity. 



47. Natica (Lunatia) plumbea. 



Natica plumbea, Lamarck, Philippi in Kilster's Con.-Cab. p. 51, pi. 8. 



figs. 3, 4 ; Heeve, Conch. Icon. figs. 34 a, b. 

 Natica strangei, Heeve, I. c. flgs. 81 a, b. . 

 Exemplum distortum= Natica leucophsea, Heeve, I. c. figs. 51 a, b. 



Hah. Port Denison, Queensland, on the shore (Coppinger) ; Cape 

 Upstart, and from north of Cape Hillsboro', N.E. Australia, crawl- 

 ing on sand- or mud-banks at low- water mark (J. B. Jukes in Brit. 

 Mus.); Port Essington (Gapt. WicMdiri, JR.M.) ; Brisbane Water 

 (Strange) ; New South Wales (Angus), &c. 



48. Natica limpida. (Plate V. fig. L.) 



Shell subglobose, thinnish, semitransparent, whitish, somewhat 

 narrowly unbilioated, glossy, sculptured with fine lines of growth. 

 Spire small, culminating in an obtuse apex. Whorls 3|, very 

 convex, rapidly increasing, separated by a simple linear suture, 

 beneath which there is a narrow opaque-white margin. Aperture 

 rather more than semicircular, narrower above than at the lower 

 part. Columella slightly oblique, straightish or only feebly arcuate, 

 a little thickened, somewhat expanded at the upper part, and joined 

 to the extremity of the outer lip by a thin callosity. Outer lip 

 (viewed laterally) a trifle oblique, and exhibiting near the suture 

 a small shallow sinuation. Umbilicus rather narrow, without any 

 internal ridge. Operculum unknown. Length 8 millim. ; greatest 

 diameter 9, smallest 6^. 



Hah. West Island, Prince of Wales Channel, Torres Straits, 

 7 fms. 



This may prove eventually to be the young state of the species, 

 a supposition partly based upon the larger size of the nuclear whorls 

 and partly upon the thin semitransparent character of the shell. 



49. Natica (Mamma) columnaris. 



Natica columnaris, Reelwa, Reeve, Conch. Icon. figs. 19 a, 6. 



Hah. Prince of Wales Channel, 9 fms. (Coppinger) ; Philippine 

 Islands (Cuming) ; Ceylon (E. W. H. Hpldsworth in Brit. Mus.). 



