CHLOROSTOMA. 181 



keel ; the base is concentrically, rather deeply furrowed, the 6 

 furrows narrower than the intervening ridgres. In the umbilicus, 

 which perforates almost to the apex, all of the whorls are visible, 

 encircled by an acute carina ; the aperture is subquadrate, nacreous, 

 smooth within, and has a groove indicating the place of the exter- 

 nal keel; the coluralla is S-shaped, and ends in a blunt tooth, 

 before which there is a small acute denticle ; above, the columellar 

 plate is callous, and covers a small portion of the umbilicus. The 

 pretty markings of the shell consist of oblique, regular wide black 

 streaks, sejaarated by spaces as broad as themselves, on a white 

 ground. 



Alt. 24, diam. 25 mill. There are also narrower forms. {Philippi.) 



Coast of Peru. 



T. melaleucos Jonas, Zeitschr. f Mai. 1844, p. 1()9. — Philippi 

 Abbild. u. Beschreib., ii, Trochus, t. 6, f 7 ; and Conchyl. Cab., p. 

 185, t. 28, £16. 



Evidently closely allied to Chlorostoma rubrojiavimulahivi. 

 C. FuscESCENS Philippi. PL 61, figs. 42, 43. 



Shell depressed-conical, narrowly umbilicate, acute, brown ; 

 whorls densely spirally striated ; nearly flat, subangulate at the 

 sutures ; last whorl subangular at the periphery ; columella sub- 

 excised, base bidentate, above i>roduced in a short lobe partly im- 

 pinging upon the umbilicus. (Phil.) 



The shell consists of 5 to 6 whorls, and has a great likeness to the 

 Mediterranean T. (Glbbula) varius in size, form of the whorls, stria- 

 tion and coloration ; the whorls are almost entirely flat, only con- 

 vex above near the suture ; the last whorl is pretty angular, almost 

 raarginated ; the aperture is rounded-quadrangular, the columella 

 strongly excavated, with two denticles below, separated by a nacreous 

 depression, above produced into a callous which lies partly around 

 the umbilicus, but is not so conspicuous as in other species. The 

 umbilicus is narrow, white, distinctly bounded by a blackish l)and, 

 which goes to the lower tooth of the columella, on others the color 

 is brown, marbled with a few lighter flecks. There seems to be a 

 variety in which there are separated elevated, carina-like lints. 



Alt. 11, diam. 14 mill. {PhiUpxn.) 



Chili. 



T. fascescens Phil., Abbild., etc., i, Trochus, t. 3, f 8, (1884.) 

 (Not Oinphalius fascescens Carpenter et sxu.ct.,= Chlorostoma ligula- 

 tum Mke.) 



