CHLOROSTOMA. 177 



Var. LIGULATUM Menke. PI. 29, figs. 58, 59, 60. 



This is an extremely variable form. The shell may be either very 

 much depressed or as high as broad. It may be spirally sculptured 

 with numerous narrow, unequal line, or as strongly cingulate as the 

 preceding form. The best development of this variety is shown by 

 the specimens before me from San Diego. They are elevated, 

 turbinated, strongly granose-lirate ; the base is deeply eroded in front 

 of the aperture ; the color is brownish-yellow, with numerous close 

 narrow longitudinal purplish-brown stripes, but the whole surface is 

 so dingy that it appears unicolored ; the spiral lirae are subequal, the 

 grains low and elongated in the direction of the Iira3. The whorls 

 are rounder than in C. viridulum, and the aperture decidedly smaller, 

 and lacking green tinge on the columella. 



Alt. 22, diam. 22 ; alt. 14, diam. 18 mill. 



Panama to California. 



Trochus ligulatus MENKE, Zeitschr.f. Mai., 1850, p. 173. Om- 

 phalius ligulatus CARPENTER, Cat. Mazatlan Sh., p. 235. 0. fusees- 

 cens, CARPENTER, Suppl., Rept. on Moll. W. Coast N. A., p. 652 

 (and of subsequent American collectors and authors, not of 

 Philippi!}. T. ligulatus FISCHER, Coq. Viv., p. 382, t. 115, f. 5. 



Figs. 59, 60 are drawn from San Diego specimens. C. ligulatum 

 differs from C. reticulatum and C. viridulum in lacking broad 

 radiating stripes. It is usually encrusted with Bryozoa or Serpula. 



C. CORONULATUM C. B. Adams. PL 24, figs. 80-83. 



Shell umbilicate, more depressed and less conical than C. reticu- 

 latum ; color dingy white, with broad radiating flames of brown or 

 red above irregularly maculated below, sometimes nearly unicolored, 

 pinkish, with the lirse of the base articulated with red and white 

 dots. The spire is either conic or depressed ; the sutures either 

 simple, linear, or somewhat canaliculate. The whorls number 

 about 5 ; they are spirally transversed by excessively minute spiral 

 stride ; the last whorl has an acute carina at the periphery, and an 

 angulation or keel at the middle of the upper surface of the whorl 

 and continued upon the spire, and which is usually nodose on the 

 last whorl ; there is usually, too, a third ridge or carina, generally 

 nodose, betweeen the two already described. The base is more or 

 less convex, generally shows microscopic concentric stria? under a 

 lens, and has about 5 low, narrow, separated lirulse. The aperture 

 12 



