370 CALLIOSTOMA. 



a trifle crenulated inside; the columella has a slight excavation, 

 and is very bluntly nodulous near the base ; its inner face is dark, 

 pearly. Alt. 5, diam. 5 mill.; alt. 7J, diam. 7 mill. 



San Pedro; San Diego; Catalina Id.; California. 



C.formosum CPU., Proc. Cal. Acad. iii, p. 156 (not T. formosus 

 Forbes). C. supragranosum CPU., 1. c., p. 214. 



The above description is drawn from a typical specimen received 

 from Dr. Dall. Two others, larger arid more uniform in color are 

 before me ; one of them is rigured on my plate. The shell never 

 attains anything like the size of C. gloriosum. 



C. LEANUM C. B. Adams. PI. 57, fig. 50. 



Shell conic, well elevated ; pale yellowish or reddish-brown, with 

 broad dark brown oblique flammules ; anteriorly somewhat articu- 

 lated with red and yellowish-white in fine concentric lines ; with 

 many elevated granulous spiral lines, of which three larger are next 

 above the suture ; spire with the outlines nearly rectilinear ; apex 

 acute ; whorls nine, planulate or concave next below the suture, 

 which is moderately impressed ; last whorl subplanulate anteriorly ; 

 aperture subquadrate ; labrum thin ; columella obliquely produced, 

 nearly straight ; umbilicus wanting. 



Alt. '48 in. Maj. diam. '44, min. diam. *4 in. (C. B. Adams.) 



Panama. 



Seven specimens were collected on the reef. We have named this 

 pretty species in honor of Isaac Lea, Esq., of Philadelphia. (C. B. 

 Adams.) 



Trochus leanus C. B. ADAMS, Cat. Panama Shells, p. 191, 1852. 



C. TRICOLOR Gabb. PL 67, fig. 52. 



Shell conical, about the form of C. lima; rather solid ; yellowish 

 or olive-ashen, with three or four principal spirals above purple, 

 articulated with white, 3 to 6 on the base similarly marked ; often 

 obscurely clouded above with dark brown or olive, often with white 

 spots between the dark patches. Whorls about 7, obtusely biangu- 

 late at periphery, the superior angle prominent on the spire whorls ; 

 apex very minute, acute ; surface cut into a finely densely granulated 

 pattern by the decussation of numerous spiral stride with close, 

 regular, impressed lines of increment. Base slightly convex, encir- 

 cled by numerous unequal line. Aperture oblique, subrhomboidal ; 

 columella arcuate, not at all truncate at base, its edge pearly, white, 



