ACM^A. 53 



rude, strong, usually unequal ribs, which denticulate the margin ; 

 the ribs are whitish, interstices dull-black ; sometimes the whole 

 shell is of a light buff- tint. 



Inside white with either a blue or a pink tint ; central area irreg- 

 ularly clouded with rust-brown or black, showing through a thin 

 white layer ; border white, black, or dotted. 



Length 14, breadth 10, alt. 4 mill. 



New Zealand. 



Patella lacunosa REEVE, Conch. Icon. f. 120, 1855. Acmcea cor- 

 ticata HUTTON, Man. N. Z. Moll. p. 89, 1880. f Fissurella rubiginosa 

 BUTTON, Cat. N. Z. Moll. p. 42, teste Martens Zool. Rec. x, p. 150. 



A small, roughly sculptured species, with much the aspect of 

 Siplionaria. This likeness is increased by the frequent unsym met- 

 rical distortions of the shell. Reeve figured a clear buff specimen ; 

 but this coloration is comparatively rare, only one out of twenty- 

 three shells before me being wholly without the black stripes. When 

 the outside lacks stripes, the inside is very light, its border without 

 dark dots. The young often snow dark rays within like A.jackson- 

 iensis. 



I have some doubt about the A. rubiginosa. It may prove a dis- 

 tinct species, being shorter and rounder. The original description is 

 given in the MANUAL Vol. XII, p. 216. See also torn. ciL p. 291. 



A. CINGULATA Hutton. 



Shell moderately thick, white, oval, conical ; apex about one-third 

 of the length from the anterior end ; about 30 to 50 low radiating 

 ribs. Interior white, the margin light brownish-pink, banded with 

 white. Length *56, breadth '45, alt, '2 inch. (Hutton.) 



Lyttelton and Dunedin, New Zealand. 



A. eingulata HUTTON, Trans. N. Z. Institute, xvi, p. 215, t. 11, f- 

 5 (dentition), 1884. 



The shell much resembles that of A. lacunosa Rve. (=corticaria 

 Hutton), but the ribs are finer and the margin differently colored ; 

 the teeth, however, are very different ; it may prove to be a variety 

 of A. rubiginosa, the dentition of which is not yet known. 



(Hutton.} 



A. CONOIDEA Quoy & Gaimard. PI. 37, figs. 84, 85. 



Shell ovate, arcuate, decidedly conical, apex obtuse, rounded ; 

 ashen ; inside corneous-brown, margin spotted. 



