BY PROFESSOR F. W. HUTTON, F.G.S. 367 



Yellowish with longitudinal undulating lines of dark purple, 

 or altogether purple. Mouth yellow, articulated with purplish 

 black. 



T. brunien&is, Petterd, from Tasmania is closely allied. 



Variety, pltjmbea. Hutton, (1883). 



Habitat. — Banks' Peninsula to Dunedin, Campbell Island. 



Dark purple, mouth black. 



The dentition is figured in the Trans. N.Z. Institute, XV., pi. 



15, fig. E. 



Variety, guttata. Hutton (1884). 



Habitat. — Nelson. 



Dark purple, usually spotted with white ; mouth black ; 

 columellar lip greenish at the base ; interior highly iridescent, 

 markedly grooved. 



This variety looks like a hybrid between M. nigerrima and 

 M. melanoloma. 



Monodonta subrostrata. Gray in Yates' New Zealand, (1835), 

 and in Dieffenbach's New Zealand, II., p. 238 (1843) ; Voy. 

 Erebus and Terror, Moll. pi. 1, fig. 14. 



Habitat. — Auckland to Tauranga. On Zostera marina. 



Shell with sub-nodulose spiral ribs, which are distant on the 

 upper surface and closer on the base. Yellowish with undulating 

 longitudinal purple lines ; mouth yellow, more or less marked 

 with purple. 



The dentition is figured in Trans. N.Z. Institute, XV., pi. 15, 

 fig. G. 



Monodonta sulcata. Wood. Trochus cingulatus, Quoy and 

 Gaimard, Voy. Astrolabe, Zool. III., p. 259, pi. 64, figs. 

 16-20 (1834) [not of Brocchi] ; Gray Pigs. Moll. Anim. I., 

 pi. 40, fig. 10 ; Trochus gaimardi, Philippi in his new edition 

 of Chemnitz. 

 Habitat. — Cook's Straits to Dunedin. 



Shell with three nodulose spiral ribs and raised lines between 

 on the upper surface of the body whorl ; about four closer ribs on 



