260 PROCEEDINGS OF THE MALACOLOGICAL SOCIETT. 



REVISION OF THE NEW ZEALAND TROCIIID.E. 

 By Henry Suter. 



Read Uth May, 1897. 



Fam. TROCHIDiE. 

 Subfam. Trochin.^*;. 



Genus. TROCHTJS, Liune, 1758. 



Subg-en. Infundibulum, Montfort, 1810. 



Sect. ccELOTRocHus, Fisclier, 1880. 



1. Teochus tiaeatus, Q,uoy & Gaimarfl. 



Trochus tiaratiis, Quoy & Gaim. : Voy. Astrolabe, Zool. vol. iii (1834), 

 p. 256, pi. Ixiv, figs. 6-11 ; Hiittou, Proc. Linn. Soc. New 

 8ontb Wales, vol. ix, p. 358 ; Pilsbry, Man. Conch., scr. i, 

 vol. xi, p. 42, pi. xii, figs. 72-4 ; pi. 1, fig. 4 (radula). 



Anthora tiarata (Quoy & Gaim.) : Hntton, Man. New Zealand Moll., 

 p. 94 ; Hntton, Trans. New Zealand Inst., vol. xiv, p. 165, 

 pi. vii, fig. N (radnla). 



Trochus delicatidus, Philippi : Zeitscli. Malak., 1846, p. 105. 



Polydonta elegans, Gray: Yates' "New Zealand," 1835, p. 309. 



Five to five and a half whorls ; 5-8 spiral lirse of oblique beads 

 on the penultimate whorl. Columella with an obsolete fold above. 

 Umbilical area smooth. Alt. 10, diam. 13'5mni. 



Hah. — On rocks near low-water mark from Auckland to Duncdin ; 

 common in the North, rare in the South Island. 



2. TEOcnrrs Cuathamensis (Hutton). 



Polydonta Chatlmmensis, Hutton : Cat. Mar. Moll. New Zealand, 



1873, p. 36. 

 Anthora Chathamensis, Hutton : Man. New Zealand Moll., 1880, p. 94. 

 Trochus Chathamensis, Hutton : Proc. Linn. Soc. New South "Wales, 



vol. ix, p. 359 ; Pilsbry, Man. Conch., ser. i, vol. xi, p. 43. 



Troclmx ChtitliaDiomis (Ilutti)n). 



Six whorls, with 5-6 close, low, spiral ciugidi between the upper 

 and lower margins, which are strongly elevated. Upper edge of whorls 

 nodulous, lower edge spirally striate and as a rule more prominent than 

 the upper one. Longitudinal oblique markings of brownish-purple on 



