'MONODONTA. 105 



specimens received from Professor HUTTON, who considers it doubt- 

 fully distinct from M. undulosa Ad. The animal is like that species. 



Var. PLUMBEA Hutton. PI. 20, figs. 15-17. 



Shell globose-conic, imperforate, solid, dull purplish, the spin- 

 eroded, white, the base usually somewhat eroded, bluish ; spire conic, 

 acute ; whorls 4-5, the last obsoletely coarsely lirate ; aperture as in 

 M. melanoloma, but outer lip margined within only by black ; colu- 

 mella as in M. melanoloma, but bordered outside by black. 



Alt. 141, diam. 16 mill. 



Xeiv Zealand. 



Diloma plmnbea BUTTON, Trans. X. Z. Institute, xv, p. 126 (1883). 



Animal, according to Hutton, like M. rethiops, the foot being 

 margined with a band of black and white transverse stripes. Denti- 

 tion ; central teeth as in M. corrosa ; cutting points of laterals dentic- 

 ulated on both sides; cutting points of inner marginals denticulated 

 on outer edges only ; those of outer marginals on both edges. Shell 

 like M. corrosa, but lacking the marginal yellow T stripe within the 

 lip. The specimens described and figured were received from Profes- 

 sor HUTTON. 



Var. UNDULOSA A. Adams. PL 22, figs. 45-47. 



Yellowish, with longitudinal undulating lines of dark purple, or 

 altogether purple ; mouth yellow, articulated with purplish-black. 

 (Hutton.') 



Banks Peninsula to Dunedin, X. Z. 



Chlorottoma unduloswn A. AD., P. Z. S. 1851, p. 182. E. A. 

 SMITH, Zoo/. Erebus and Terror, Mollusca, p. 4, t. 1, f. 15 (1874). 

 Diloma undulosa HUTTON, Manual X. Z. Moll., p. 96 (1880). T. 

 uttrihi* HOMBR. ET JACQ., Voy. au Pole Slid., p. 57, t, 14, f. 19-20 

 (1853). FISCHER, Coq. Fit'., p. 186, t. 61, f. 2. 



Var. GUTTATA Hutton. 



Dark purple, usually spotted with white; mouth black; columellar 

 lip greenish at base ; interior highly iridescent, markedly grooved. 



This variety looks like a hybrid between M. nigerrima [M. porci- 

 fer !] and M. melanoloma. (Hutton.") 



Nelson, X. Z. 



M. CARBONARIA Philippi. PI. 34, fig. 30. 



Shell elevated-conoidal, imperforate, solid, smooth, black ; whorls 

 slightly convex, the last rounded; aperture rhombic-rounded, 



