MONODONTA. 99 



umbilical tract very broad, subconcave, bounded on the outer lower 

 margin by a chocolate streak. Alt. 25-33, diam. 25-30 mill 



N'W Zealand. 



T. cethiops GMEL., Syst. Nat., xiii, p. 3596. PHILIPPI, Conchyl. 



Cab., p. 147, t. 24, f. 10, 11. FISCHER, Coq. Viv., p. 185, t. 61, f, 1. 



T. zelandicus Q ( UOY ET GAIM., Voy. de I'Astrol., iii, p. 257, t. 64, 



f. 12-15. T. reticularis GRAY, Dieffenb. N. Z. ii, p. 238. Ind. Test. 



suppl., t. 5, f. 21. 



Easily recognized by the distant narrow spiral black grooves, the 

 intervening tracts flat, black, articulated with white. 



31. STRIOLATA Quoy et Gaimard. PL 19, figs. 97, 98. 



Shell imperforate, globose-conic, generally rather depressed, very 

 thick and solid, yellow and black, tessellated or longitudinally 

 striped, sometimes the black, sometimes the yellow predominating ; 

 spire very short conic, apex usually perfect and acute, often ruddy ; 

 whorls 5, slightly convex, very rapidly increasing, spirally strongly 

 cost-ate, the ridges 13 or 14 in number on the last whorl ; body- 

 whorl slightly descending at the aperture, not eroded on the base ; 

 aperture large, oblique ; outer lip margined within with yellow 

 and black, followed by a nacreous and then by an opaque white 

 thickening which more or less contracts the aperture and which is 

 more or less notched at about the place of the periphery ; columella 

 white, much narrower than in 31. setlriops. bidenticulate below. 



Alt. 20-22, diam. 23-25 mill. 



S. Australian and Tasmanian Coasts. 



T. striolatm Q ET G., Voy. de I' Astrolabe, iii, p. 253, t, 63, f. 18- 

 22. PHILIPPI, Conchyl. Cab., p. 158, t. 26, f. 1. FISCHER, Coq. 

 Viv., p. 187, t. 61, f. 3. T. concameratus WOOD, Ind. Test, suppl., t. 

 6, f. 35 (no desc.). T. viridis WOOD, Ind. Test, suppl., t. 6, f. 36 

 {not T. viridis Gmel.). Labio fuligineus A. AD., P. Z. S., 1851, p. 

 ISQ. T.fuligineus WATSON, Challenger Moll., p. 67, t. 4, f. 11.? T. 

 zebrinus PHIL, Conchyl. Cab., p. 161, t. 26, f. 6. 



The more prominent characters of this species are the strong spiral 

 ribs and the thick outer layer of yellow and purplish-black, or of 

 black veined with yellow, which usually assumes a tessellated 

 pattern. Sometimes, however, the black predominates to the almost 

 entire exclusion of yellow, and specimens also occur in which the 

 black is scarcely visible on the surface. Both of the names given in 



