1880.] MR. G. F. ANGAS ON NEW MARINE SHELLS. 419 



of wliich are stained with dark brown ; canal moderate, a little re- 

 curved and partly closed by the union of the two lips at their base. 



Alt. 3 inches, diam. 2 inches. 



Hab. Port Darwin, Torres Straits {W. T. Bednall). 



Another very beautiful shell, belonging to the Pteronotus group 

 of Murices (also discovered by Mr. Bednall, and provisionally 

 named by Mr. Brazier), which I have great pleasure in figuring in 

 the Society's * Proceedings.' 



Clanculus bicarinatus, n. sp. (Plate XL. fig. 4.) 



Shell umbilicated, turbinate, solid, very dark purplish brown ; 

 whorls 6, prominently keeled in the centre, the last whorl with two 

 keels, one above and one below the periphery, sculptured all over 

 with distinct separated rows of regular close-set bead -like nodules, 

 those on the keels being double the size of those between them, the 

 interstices crossed with fine oblique striae ; outer lip strongly den- 

 tate within, and surrounded by a row of black spots at the margin ; 

 columella nearly straight, with a small tooth-like projection at either 

 end, the margin of the false umbilicus dentate, with an incurved 

 tooth above, and crenate at the base, around the umbilical margin 

 white ; interior pearly white. 



Alt. 6, diam. 8 lines. 



Hab. Port Darwin, North Australia {W. T. Bednall). 



This shell is remarkable from its having two strong keels on the 

 last whorl, and also on account of its uniform dark-brown colour. 



Helix (Rhagada) bordaensis, n. sp. (Plate XL. fig. 3.) 



Shell widely and deeply umbilicated, lenticular, moderately thin, 

 very strongly and irregularly obliquely flexuously corrugated, the 

 corrugations becoming larger and more elevated towards the middle 

 of the whorls, cretaceous, white ; spire depressed, apex obtuse ; 

 sutures very strongly impressed and crenated ; whorls 5, nearly flat, 

 the last depressed and strongly keeled above the periphery, not de- 

 scending in front, slightly keeled around the umbilicus ; aperture 

 oblique, semilunar; outer lip simple; columella very slightly ex- 

 panded; margins united by a thin callus. 



Diam. maj. 8, min. 7, alt. 3| lines. 



Uab. Cape Borda, Kangaroo Island, South Australia {W. T. 

 Bednall). 



This remarkable shell exhibits a somewhat similar sculpture to 

 H. silveri, Ang. (P. Z. S. 1868, p. 27.5), and H. kooringensis, Aug. 

 (P. Z. S. 1 8/ 7, p. 33) ; but it differs from both those species in having 

 the raised corrugations more numerous and elevated, displaying at 

 the sutures and on the keel an elegant frilled appearance. It is also 

 smaller, flatter, has a wide perspective umbilicus ; and the corrugated 

 ridges show here and there a tendency to bifurcate. 



EXPLANATION OP PLATE XL. 



Fig. 1. Volufa (Aiiiica) hednalU, p. 418. 



2. Murex {Pteronoius) hcdnalU, p. 418. 



Proc. Zool. Soc— 1880, No. XXVIII. 28 



