[From the ‘ProcEEDINGS OF THE Matacoxoercat Soctery,’ Vol. IT, 
rom 
Part 6, November, 1897. | 
REVISION OF THE NEW ZEALAND TROCHID. 
By Henry Sourer. 
Read 14th May, 1897. 
Fam. TROCHIDA. 
Subfam. TRocHIN»®. 
Genus. TROCHUS, Linné, 1758. 
Subgen. Iyrunprsvtum, Montfort, 1810. 
Sect. caLoTRocuvs, Fischer, 1880. 
1. Trocuvs TIaRATUSs, Quoy & Gaimard. 
Trochus tiaratus, Quoy & Gaim.: Voy. Astrolabe, Zool. vol. iii (1834), 
p. 256, pl. lxiv, figs. 6-11 ; Hutton, Proc. Linn. Soc. New 
South Wales, vol. ix, p. 858; Pilsbry, Man. Conch., ser. 1, 
vol. xi, p. 42, pl. xii, figs. 72-4; pl. 1, fig. 4 (radula). 
Anthora tiarata (Quoy & Gaim.): Hutton, Man. New Zealand Moll., 
p- 94; Hutton, Trans. New Zealand Inst., vol. xiv, p. 165, 
pl. vu, fig. N (radula). 
Trochus delicatulus, Philippi: Zeitsch. Malak., 1846, p. 105. 
Polydonta elegans, Gray: Yates’ ‘‘ New Zealand,’ 1835, p. 309. 
Five to five and a half whorls; 5-8 spiral lire of oblique beads 
on the penultimate whorl. Columella with an obsolete fold above. 
Umbilical area smooth. Alt. 10, diam. 13°5 mm. 
Hab.—On rocks near low-water mark from Auckland to Dunedin ; 
common in the North, rare in the South Island. 
2. Trocuus Cuatuamensts (Hutton). 
Polydonta Chathamensis, Hutton: Cat. Mar. Moll. New Zealand, 
1873, p. 36. 
Anthora Chathamensis, Hutton: Man. New Zealand Moll., 1880, p. 94. 
Lrochus Chathamensis, Hutton: Proc. Linn. Soc. New South Wales, 
vol. ix, p. 859; Pilsbry, Man. Conch., ser. 1, vol. xi, p. 43. 

Trochus Chathamensis (Hutton). 
Six whorls, with 5-6 close, low, spiral cinguli between the upper 
and lower margins, which are strongly elevated. Upper edge of whorls 
Ee tlone, lower edge spirally striate and as a rule more prominent than 
© upper one. Longitudinal oblique markings of brownish-purple on 
