UJ ACANTIK i IIITES. 



Mauritius u. <ler Seychfllon, (M.'ibius' Reise nacli Mauritius), 

 p. 300 (1880.) 



This species may be readily known by the light ground-color, the 

 proportions of the posterior valve, and the fringe of long peripheral 

 when these are retained. The sculpture differs markedly 

 from the Cape species, the pustules being notably elongated, of a 

 narrowly drop-shaped contour, averaging one-fifth of a mill, in 

 length. 



(2) Species of New Zealand and Australia. 



A. /.i.i 4JTDIOOB <,}uoy <fc Gaimard. PI. 14, figs. 9, 10. 



Shell elongated, moderately elevated, hardly carinated. Greenish 

 or gray, or "yellowish dotted with brown, some valves with a black 

 line at the summit/' 



The median valves are hardly beaked. Latero-pleural areas 



covered with closely crowded, ovate, flattened granules. Dorsal 



areas narrowly triangular, closely and finely striated longitudinally. 



rior valve having the tegmentum small, transversely oval, 



fxlln irider than long. 



Interior dark blue-green, often stained with purple along the 

 cavity. Sinus very wide and squarish. Posterior valve obtusely, 

 hianiruhir behind, the edge of the insertion-plate, between the slits, 

 minutely and distinctly crenulated. 



< iirdle rather narrow (in the dried state), greenish, covered with 

 very short spicules, and having a marginal fringe of longer spicules, 

 and 18 tufts of light blue spicules. 



Length 28, breadth 12 mill. 



Length 25, breadth 10 mill. 



Pass of France (Q. & G.) ; Auckland to Dunedin (Hutton), New 

 Zealand, on stones below low water-mark. 



t'liifoi, lelaiidicus Q. & G., Zool. Voy. de FAstrol., Hi, p. 400, 



. f. 5-8 (1834). REEVE, Conch. Icon., f. 5&.Acanthnr]tif.* 



zealandicus HUTTON, Man. N. /. Moll, p. 117 (1880). Acnnthii- 



* hookeri GRAY, in Dieffenback's Travels in New Zealand, ii 



p. 262 (1843.) 



This species has been reported from Japan (Schrenck, Amurl. 

 Moll., p. 27-'. > but incorrectly, the Japanese species being distinct. 



The coloring is variable. Hutton writes : Mantle brown ; spines 

 pale green ; valves generally greyish-black, more or less varied with 



