150 FISSURELLA. 



roded in appearance, scarcely showing rays. There are no striae, 

 even in young shells. The inside is white, with a rather narrow 

 purplish-black border (2 to 3 mill, wide) ; muscle-impression con- 

 spicuous, roughened. 



Length 77, breadth 51, alt. 20 mill. 



Length 52, breadth 39, alt. 14 mill. 



Chili. 



F. limbata Sows. P. Z. S. 1834, p. 123 ; Conchol. Illust. f. 74. 

 REEVE, Conch. Icon. f. 10, 12. SOWB. Thes. Conch, iii, p. 184, 

 f. 23, 24. 



Allied to F. nigra, but having color rays and entirely lacking 

 radiating striae. 



F. PUNCTATISSIMA Pilsbry. PI. 58, figs. 21, 22, 23. 



Shell ovate, conical, the summit about central ; sculptured with 

 close fine radiating striae, which become coarser toward the margins. 

 Perforation oblong, 2} times as long as broad, parallel sided, its 

 length contained 8 times in the length of the shell. Dark margin 

 of the inside very narrow. 



The outline of the base is about as in F. latemarginata, but it is a 

 much more elevated cone. It is solid, thick, of a reddish fawn 

 color, radiately closely striate. The inside is white, with a very 

 narrow dark-grayish border. The area to the sides and in front of 

 the hole, as far as the adductor muscle, is finely and closely punctate. 

 The muscle scar is conspicuous, being moderately roughened. 



Length 88, breadth 66, alt. 22 mill. 



Length 93, breadth 66, alt. 23 mill. 



Chili. 



The diagnostic characters of this large species may be very briefly 

 stated : exterior finely radiately striated ; inside white with a very 

 narrow dark border, the area occupied by the gills densely punctate. 

 There is no eroded tract around the key-hole. One specimen was 

 presented to the Academy by Mr. Frank C. Baker, and another is 

 in the collection of John Ford Esq. of Philadelphia, with the 

 locality Valparaiso, Chili. 



F. BELLA Keeve. PI. 33, fig. 48. 



Shell deeply convex, rather elevated in the middle, acuminately 

 attenuated anteriorly, radiately, obscurely grooved ; basal margin 

 narrow ; orifice oblong ; ash-brown, banded concentrically alter- 

 nately lighter and darker, rayed with bright crimson lake. A com- 



