706 STUDIES ON AUSTRALIAN MOLLUSCA, xiii., 



buff except the black eyes, which showed through the transparent 

 mantle. 



LucAPiNELLA NiGRiTA Sowerby. 

 (Plate xlvii., fig.lO.) 

 Lucapinella nigrita Hedley, Proc. Roy. Soc. Vict., xi., 1894, 

 p.24. 



'I'he above sketch was taken from a living specimen at 

 Narooma, N.S.W. The animal has already been described in 

 the reference above cited. 



Nerita melanotragus Smith. 

 (Plate xlviii., tigs. 13, 14.) 



The nomenclature of this species has already been discussed 

 in these Studies [antea, xxv., p. 500). 



The animal has narrow black stripes on a buif ground, along 

 the muzzle and upper surface of the foot, the rest being buff. 

 The muzzle is produced into a long and broad lip, fimbriated at 

 the margin. When crawling, which is done with deliberation, the 

 muzzle, expanded to the breadth of the foot, brushes along the 

 ground in front. The ocular tentacle is a flat, triangular lobe 

 grooved on the inner side for the reception of the long, slender, 

 tactile tentacle. It is produced into a spur on the outer base, 

 and is connected by an epipodial fringe with the opercular lobe. 

 The mantle has two lobes, one above the operculum, the other 

 spread below the base of the columella. The margin of it is 

 plain, though in other species it is said to be festooned. In a 

 considerable number of individuals examined, no intromittent 

 organ was observed. The foot is rather small, I'ounded in front 

 and behind. Sometimes, as in the figure, the gill-plume is pro- 

 truded from the dorsal cavity till its tip reaches the aperture of 

 the shell. The eggs are separate, white, oblong capsules with a 

 continuous, tough membrane. Frequently, these are deposited 

 on the shells of other individuals of the same species. The 

 operculum (Fig. 14) has a smooth, median, falcate area, on each 

 side of which are small, crowded pustules; the convex margin 

 has a membranous edge. 



