116 MR. (;. F. ANGAS ON NEW AUSTRALIAN SHELLS. [Jan. 2-1, 



and extending inwards are concentric waved bands of olive-brown 

 darker at the margin ; lateral areas not raised, divided from the 

 dorsal areas by radiating nodulous ribs, transversely rugosely costate ; 

 dorsal areas finely longitudinally ridged ; mantle brown, variegated 

 with ash-colour and clothed with very minute chaff-like scales. 

 Length 8 lines. 



Port Jackson {Coll. Angus). 



30. TONICIA CARPENTERI, n. S. (PI. XIII. fig. 30.) 



Shell ovate, elevately convex, carinated, ashy white, ornamented 

 at the hinder edges of the valves with pale spots, the spaces between 

 which are very dark olive melting into confused bands of a paler hue, 

 which extend nearly across the valves ; valves rostrate, undulately 

 concentrically subimbricately sculptured throughout ; the lateral 

 areas not raised, but separated from the dorsal areas by an elevated 

 rib ; posterior valve strongly gibbous, the umbo almost terminal ; 

 mantle-margin broAvn. Length 9 lines. 



Port Jackson {Coll. Angas). 



31. LeUCOTINA ESTHER, n. s. (PI. XIII. fig. 31.) 



Shell ovate, rather solid, scarcely rimate, whitish ; whorls five, 

 transversely grooved and crossed with very fine longitudinal lines ; 

 aperture oblong-ovate, half the length of the shell ; columella white, 

 straight, parietal fold hardly visible. Length 2| lines, breadth 

 I5 line. 



Port Jackson, deep water {Coll. Angas). 



32. Chelidonura adamsi, n. s. (PI. XIII. fig. 32.) 



Head furnished in front with a short silky fringe ; mantle termi- 

 nating behind in two long bifurcate filaments ; foot elevated on each 

 side, embracing the head and mantle, rounded both in front and be- 

 hind ; colour velvet-black, with a white crescent on the hinder part 

 of the mantle ; the head and the outer edge of the foot are bordered 

 with a line of brilliant blue ; a line of the same colour, bifurcated in 

 front, extends down the back ; and the posterior filaments are orna- 

 mented in the middle with a similar line ; parallel with these blue 

 lines, and at a short distance from them, are lines of a gold-colour ; 

 and spots of the same appear above the white crescent on the back, 

 and at the bifurcation of the posterior filaments. Shell internal, very 

 small, thin, flat, with the right border terminating in a point. Length 

 2 inches. 



Found in a rock-pool at low water at Vaucluse Bay, Port 

 Jackson. 



This species mav be identical with the individual alluded to by 

 Quoy as having been met with at the Mauritius among numerous 

 specimens of his Bulla hirundinina, but which was not described by 

 him. I have named it in honour of my friend Mr. Arthur Adams, 

 the founder of the genus Chelidonura. 



