GASTROPODA. 71 



Remarks. Only one adult specimen from the first-named locality. 

 The very pretty small forms no doubt live in the laminarian zone, and 

 very likely never attain a much larger size there ; but specimens 

 reaching the littoral zone will no doubt grow to the full size of the 

 species, with its most constant characters. 



11. Acmaea pileopsis, Quoy and Gaimard, 1834. Plate 7, fig. 4. 



Patelloidea pileopsis, Q. & G., Voy. Astrol., Zool., iii, 359, pi. 71, f. 25-27. 

 Acmtei pileopsis, Q. & G., Man. Conch. (1), xiii, 57, pi. 37, f. 90-92. 

 Patelloides antarctica, Hombron et Jacquinot, Ann. Sci. Nat. (2 ser.), 

 xvi, 1841. 190 ; Man. Conch. (1), xiii, 157. Patella floccata, Reeve, 

 Conch. Icon., 1855, fig. 106; Man. Conch. (1), xiii, pi. 69, f. 38, 39; 

 E. A. Smith, P. Mai. S., i, 59; Suter, I.e., vi, 354. Acmcea pileopsis, 

 Q. & G., P. Mai. S., vii, 319. 



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

 and dotted with whitish. The sculpture consists of very numerous 

 fine thread-like radiate strise, 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 

 fourth of the length, slightly hooked ; anterior slope concave, seldom 

 straight. Inside white or bluish-white ; central area chestnut-brown ; 

 a dark-brown band inside the margin, very often banded with yellowish- 

 brown ; margin sharp. 



Length, 20-25 mm. ; breadth, 15*75 mm. ; height, 9 mm. (type). 

 Length, 28 mm. ; breadth, 24 mm. ; height, 10 mm. (from Manukau 

 coast). Length, 30mm.; breadth, 23 mm. ; height, llmm. (from 

 Auckland Islands). 



Dentition. Hutton, T.N.Z.I., xv, 127. pi. 15, f. M ; P. Mai. S., vii, 

 pi. 27, f. 15, 16. 



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



Hob. Both main islands of New Zealand ; Bay of Islands (Q. & 

 G.) ; west coast of Manukau (C. Spencer) ; Kawhia (K. Murdoch) ; 

 French Pass, type (Q. & G.) ; Lyttelton (H. S.) ; Snares (Captain 

 Bollons) ; Auckland Islands (A. Hamilton) ; Campbell Island (Captain 

 Bollons). 



Remarks. All the specimens I have found were fixed to rocks in 

 excavations considerably above high-water mark, and protected against 

 rain. There is considerable variation in the form of the shell, some 

 being elongated oval, others more rounded ; again, they may be 

 high or much depressed. The situation of the apex varies, and the 

 whitish dots are often small and numerous, or larger, elongate or 

 triangular, and fewer in number ; they may be present only near the 

 margin, or altogether absent. 



