SUTER : ACM^IDiE OF NEW ZEALAND. 319 



v,it]i brown. In specimens from the Auckland Islands and Campbell 

 Ishiiul the whole of the interior is bluish-black, a lighter band around 

 the spatula; it is beautifully iridescent with dark blue, quite an 

 I'M (ption in this family. Margin sharp, usually with a brown border, 

 which is sometimes banded with yellow. 



Length 14, breadth 12, height 6 mm. 



15, ,, 11, „ 7 ,, (Auckland Islands). 



16-5, ,, 12-5, ,, 4 ,, (Chicken Island). 

 The dentition is very similar to that of A. fragilis. Figs. 12-14 

 sliow different aspects of the teeth of the radula. 

 ' Hah. — Chicken Island (C. Cooper) ; west coast of Manukan 

 (C. Spencer); Dunediu ; Auckland Islands (Captains Hutton and 

 l>i'llons); Campbell Island (Captain Bollons). On rocks between 

 tide-marks. Found also in Australia and Tasmania. The type is 

 IVoin King George's Port, W. Australia. 



riie variability of this species is very remarkable ; the sculpture, 



thr colour, and the shape of the shell differ to such an extent that it 



would be easy to make about half a dozen apparently well-characterized 



species. It is onlj' by examining good series of specimens fi'om 



r ditforeut localities that the gradual transition of one form into another 



' (Mil be observed. I have also examined the dentition of several of the 



extreme forms, and found it always the same as in typical examples 



from New Zealand and Tasmania. 



c Type in Mus. Hist. Nat., Paris. 



7. AcM^A PiLEOpsis (Quoy & Gaimard). PL XXVI, Figs. 15-16. 

 Patelloidea pileopsis, Q. & G. : Voy. Astrolabe, Zool., vol. iii, 1834, 



p. 359, pi. Ixxi, figs. 25-27. 

 Lottia pileopsis, Q. : Gray in Dieffenbach's N. Zeal., vol. ii, p. 240. 

 Tecttira pileopsis, Q. : Hutton, Cat. Mar. Moll. N. Zeal., 1873, p. 43; 



V. Martens, Crit. List, 1873, p. 35; Hutton, Journ. de Conch., 



vol, xxvi, p. 36. 

 Acmcea pileopsis, Hutton: Man. jST. ZeaL Moll, 1880, p. 88; Proc. 



Linn. Soc. N.S. Wales, vol. ix, p. 373 ; Pilsbry, Man. Conch. (1), 



vol. xiii, p. 57, pi. xxxvii, figs. 90-92 ; Hutton, Index Faunte 



Nov. Zeal., p. 85. 

 Patella ides antarctica, Hombron & Jacquiuot : Ann. Sci. Nat., ser. ii, 



vol. xvi, 1841, p. 190; Pilsbry, t.c, p. 157. 

 Patella floccata, Reeve: Conch. Icon., 1855, fig. 106; Pilsbry, t.c, 



pi. Ixix, figs. 38-39; E. A. Smith, Proc. Malac. Soc, vol. i, 



p. 59; H. Suter, Lc, voL vi, p. 354. 

 Shell comparatively large, ovate-convex, radiately striated, blackish, 

 and dotted with whitish. The sculpture consists of very numerous 

 fine, thread-like, radiate striae, crenulated by concentric growth-lines. 

 Adult shells may show only the incremental lines, the radiate orna- 

 mentation having been worn off. Colour greenish -brown, dotted and 

 netted with white or light green. Specimens from the subantarctic 

 islands are often uniformly brown. Apex anterior, extending as far 

 as the margin, but occasionally situated as far back as the anterior 



