356 RHIPIDOGLOSSATE AND DOCOGLOSSATE MOLLUSCA OF N.Z., 



Genus. Cookia. Lesson. 

 Cookia sulcata. Martyn, Univ. Conch, plate 35 (1784) ; 

 Trochus coohii, Spengler Journ. Naturforscher IX., p. 155, 

 pi. 3, fig. 5-6 (1776) ; Chemnitz Conch. Cab. V., fig. 1540 

 (1781); Quoy and Gaimard Voy. Astrolabe, Zool. III., 

 p. 224, pi. 60, figs. 19-23; Grays Figs. Moll. Anim. I., 

 pi. 40, fig. 2 ; coohii nobilis, Lesson, Illus. Zool., pi. 15 (1832). 

 Habitat. — North Ireland and the Southern shores of Cook's 

 Straits ; Chatham Islands. 

 Whorls rounded, with oblique rough imbricating laminae. 



Variety davisii. Stowe, Trans. N.Z, Institute IV., p. 218 (1871). 



Habitat. — Blind Bay. 



"Whorls keeled. 



The operculum is figured by Quoy and by Adams in Genera of 

 Recent Mollusca III., pi. 45, figs. 3a-3b. The dentition is 

 figured in Trans. N.Z. Institute XV., pi. 14, fig. p. 



Genus. Imperator. Montfort. 



Imperator lmperialis. Chemnitz (Trochus) Conch. Cab. V., 

 pi. 13, figs. 1714-1715 (1781); Quoy and Gaimard Voy. 

 Astrolabe, Zool. III., p. 226, pi. 61, figs. 1-4; Gray Figs. 

 Moll. Anim. I., pi. 40, fig. 1. Trochus heliotropium, Martyn, 

 Univ. Conch., pi. 30 (1784); Reeve, Conch. Icon. Trochus, 

 fig. 30. Imperator aureolatus, Montfort, Conch. Syst. (1810). 

 Habitat. — Hauraki Gulf and Foveaux Straits. 

 Periphery with recurved triangular spines. The operculum is 



figured by Quoy ; the dentition by Hogg in the Trans. Micro. 



Soc, 1866, pi. 11, fig. 46. 



Family. Liotiid^e. 

 Genus. Cyclostrema. Marryat. 



Cyclostrema fluctuata. Hutton, N.Z. Journal of Science I., 

 p. 477 (1883) ; Trans. N.Z. Institute XVI., p. 215. 

 Habitat. — Foveaux Straits. 



