ASTRALIUM. 237 



ly squamose-Hrate ; aperture transverse, channelled at the carina; 

 columella arcuate, purple or hlue margined, dentate at base. 



Alt. 27, diam. 32 mill. 



Japanese and Chinese Seas. 



T. columellaris Phil, and T. gratus Phil, are synonyms, and in 

 part, perhaps, T. asteriscus Rve. 



Base more- concave than in ^1. j^&t^'osum, peripheral spines in a 

 single series, and finer than in that species. 



A. HEXAGONUM Phil. PI. 64, figs. 44-46. 



tShell perfectly conic, imperforate, rjeddish-white, redder in the 

 furrows, costate and obliquely rugose-sulcate, the ribs six in number, 

 subcontinuous, terminating in small vaulted spines at the base ; per- 

 iphery acute, anguiate, stellate, with twelve points ; base flat, squa- 

 mosely eight or nine lirate ; aperture suborbicular, anguiate at out- 

 er margin. Alt. 13, diam. 15 mill. 



• Habitat unknoivn. 



Philippi's description and figure are given. The species may be 

 an immature form of .4. limmatragum. 



A. SEMic'OSTATU.Ai Kicner. PI. 63, figs. 15-18. 



Shell elevated-conic, solid, imperforate, olive-brown or cinereous, 

 apex acute ; whorls 6-7, sharply carinated, upjier surface concave, 

 longitudinally more or less finely and irregularly plicate below the 

 sutures; coarsely plicate on the lower half of the whorls, the folds 

 terminating in short nodes at the periphery, twelve to sixteen in 

 number on the last whorl, and also scalloping the sutures; base 

 flat, somewhat depressed around the middle, finely concentrically 

 lirate and radiately striate, the lirJB about eight to sixteen in number ; 

 aperture very oblique, suboval, white within, slightly channelled 

 at the carina, but scarcely anguiate ; columella bluish, rosy or white, 

 short, curved, dentate below ; base of aperture horizontal, sometimes 

 Avith a submarginal row of minute tubercles within. 



Alt. 27, diam. 25 mill. 



Indian Ocean; Australia {1) 



This is Troch'us stellatus of Philippi and of Reeve. It may possi- 

 bly be the stellatus of Gmelin. That species was said by him to be 

 West Indian. 



In some specimens the peripheral sjjines are rather long and direct- 

 ed outward. The liras of the base are sometimes coarser than the 

 figures indicate ; and in fully matured individuals the outer ones be- 



