TURBO. 210 



Subgenus PRrso(4ASTER ]Morch, 1850. 



Shell very solid, ovate or subglobular, dark colored, imperforate; 



aperture large, oblique ; Operculum inside yellow, subconcave, with 



submarginal, basal nucleus; outside very convex. 



Peruvian Province. 

 Amyxa Troschel, 1852, is a synonym. 



T. NIGER Gray, 1839. PI. 42, fig. 42. 



Shell ovate, very solid, imperforate, deep dull purplish or bluish 

 black ; spire short, convex, blunt ; whorls 5-H, somewhat flattened 

 below the sutures, with superficial spiral line, and marked with light 

 incremental strite ; aperture large, very oblique, ovate, silvery inside, 

 rounded below; outer lip slightly fluted within; columella wide, 

 white, bearing on its face a longitudinal rib which rises in the region 

 of the umbilicus; parietal wall eroded, white, smooth, or with three 

 white transverse rugre. Alt. 25-27, diam. 25-80 mill. 



Coasts of Chili and Peru. 



Amyxa nigra Troschel and possibly T. lur/ubris King, (1831), are 

 synonymous. 



Operculum oval, concave within, buff, with 2-3 very rapidly in- 

 creasing whorls, nucleus one-fourth the distance across the face from 

 basal margin ; outside white, very convex, obsoletely rugose, (pi. 

 69, figs. 32, 33.) 



The animal has four lateral filaments upon the epi^jodial line on 

 either side. 



An example of which Fischer gives measurements is larger than 

 any I have seen. Alt. 38, diam, 35 mill. 



T. ELEVATUS Souleyet, 184 . PI. 46, figs. 12-14; pi. 55, %. 73. 



Shell ovate-conic, imperforate, ashy-black, spire acute, elevated; 

 whorls 5, convex, slightly excavated at sutures, nearly smooth, ob- 

 soletely spirally lirate ; last whorl large, convex below; aperture 

 ovate, silvery within; lip black; columella planate, depressed-con- 

 cave, not produced at base. Alt. 13, diam. 12 mill. 



Coast of Chili. 



Operculum yellowish inside, ovate, with two to three whorls and 

 sublateral nucleus ; outside convex, white, rugose, subumbilicate. 



T. propinqniis Hupe (pi. 55, fig. 73,) is a synonym. 



