3G6 RIIIPIDOGLOSSATE AND DOCOGLOSSATE MOLLUSCA OF N.Z., 



The dentition is figured by Troches in Das Gebiss den Schnec- 

 ken, II., taf. 23, fig. 3 ; and in the Trans. N.Z. Institute, XV., pi. 

 15, fig. A. 



Monodonta nigerrima. Chemnitz, Conch. Cab. V., pi. 185, fig. 

 1848 (1780) ; Turbo quoyi, Keiner. 



Habitat. — Banks' Peninsula to Dunedin, Chatham Islands, 

 Auckland Islands. 



Shell smooth, polished ; whorls rather closely spirally grooved ; 

 eight or nine grooves on the body whorl above the periphery. 

 Purplish black, interior highly iridescent, mouth black ; colum- 

 ellar lip greenish at the base. 



This species is apparently the same as Trochus araucanus, 

 D'Orbigny, from South America. The dentition is figured in 

 Trans. N.Z. Inst. XV., pi, fig. b. 



Monodonta melaloma. Menke, Molluscorum Novse Hollandioe, 



No. 50, p. 14, (1843). Labio carrosa, Adams, Proc. Zool. Soc. 



of London, 1851, p. 180 ; Diloma hectori, Hutton, Cat. Marine 



Moll, of New Zealand, p. 37, (1873) ; T. chloropoda, Tate. 



Habitat — Banks' Peninsula to Dunedin. Pound also in South 



and West Australia. 



Shell smooth, or with low spiral ribs, never polished. Purplish, 

 body whorl often yellow ; mouth yellowish with a thin purple 

 ring inside. 



Our shells appear to be thinner, and the interior less grooved 

 than Australian specimens, but there is no other difference. A 

 shell in the Canterbury Museum named Chlorostoma atra, Lesson, 

 from Chili appears also to be the same species. The dentition is 

 figured in Trans. N.Z. Institute, XV., pi. 15, fig. d. 



Variety. Undulosa. Adams, Proc. Zool. Soc. of London, 1851, p. 

 182 ; Voy. Erebus and Terror, Moll. pi. 1, fig. 15. Trochus 

 attritus, Hombron and Jacquinot, Voy. Pole Sud. Zool. V., 

 p. 57, pi. 14, figs. 19-20, (1854). 

 Habitat. — Banks' Peninsula to Dunedin. 



