A.STBALITJM. 23 ! 



A. Nonius (iray, 1847. PI. 63, fig. 37. 



"Shell'trochifbrm Imperforate, pale white; spire conical ; whorl- 

 nearly flat, smooth, the outer edge of the upper whorls hciim- fur- 

 nished with a broad expanded margin, which is broadlv plaited on 

 the ii])j)er side; the plaits becoming thicker and more prominent on 

 the edge of the last whorl ; front [base] of last whorl with regular 

 spiral ridges, each crossed with regular imbricate-arched scales, the 

 second and third near the circumference largest, and those in- 

 to them closer together" aperture crenated, throat silvery pearly." 



l)nmley Is., S. Pacific. 



The original description and figure are copied. I have not 

 this species ; it is evidently closely allied to A. rotuhtrlnm. 



A. FiMP.RiATt-M Lam., 1822. PL 54, figs. 46-54. 



Shell conic, more or less depressed, imperforate ; whorls 5-6^ 

 flattened above, obliquely striate, generally more or less longitudi- 

 nally finely plicate below the sutures, and spirally lirate ; periphery 

 acutely curinated, the margin pinched out into a thin, generally 

 undulating flange or rim, which is usually projecting above the sut- 

 ures ; last whorl generally descending; base slightly convex, spir- 

 ally lirate and radiately striate; aperture very oblique, transverse- 

 oval, channelled at the outer angle, white or pinkish within ; colu- 

 mella broad, flat ; color grayish, variegated above with brown, base 

 lighter. Alt. 20, diam. 26 mill. 



Australian Sms ; Tasmania. 



An extremely mutable type. The following varieties have been 

 considered distinct species', but I cannot find characters stable 

 enough to separate them. 



Var. PILEOLUM Reeve, 1842. PL 54, figs. 53, 54. 



Shell grayish white ; sculpture obsolete above and nearly so be- 

 low ; keel very broad and thin. Alt. 23, diam. 34 mill. 



T. /itnbifcnts Kiener is synonymous. Neither was ever described 

 by their authors. 



The aperture is often more deeply deflected than in the specimen 

 figured. The young are plicate above as in A. fimbriatwrn. 



Var. CUCULLATUM Kiener. PL 54, figs. 50, 51. 



Shell conical; whorls 7-8, somewhat plicate, and except the up- 

 per ones, densely granose-lirate above and below. 

 Alt. 35, diam. 46 mill. 

 More conical and elevated than the type. 



