129 



Liu. Trans, viii. p. iGe. Semicostatus;. 



p. 32<?. 

 A very elegant pellucid variety of this fliell we have re- 



:eived from the Scotif}} coaft. 



Shell Rib-cylindric, glolTy, white, with five or fix fpires Ixdistincxus. 

 nearly flat, but well defined by the feparating line ; thcfe 

 are finely flriated longitudinally, and flightly and indiftinitly 

 punftured in the furrows, obf^rvable only by the aid of a 

 po^verful lens, by which it appears cancellated, but the fine 

 tranfverre/?//^ are confined to thefidd, and do not crofs the 

 ridges : the apex is obtufe : apertui-e fub-ovate ; pillar lip 

 fmooth, and a little fpread on the columella. Length one 

 tenth of an inch ; breadth one third of its length. 



This fpecies has fomewhat the habit of T. interjllnctus , 

 but is much finer in the longitudinal ribs or Jliice • h alfo 

 deftitute of the tooth obfervable in that fliell, and is a: jnce 

 diftinguifhed under a microfcopeby its decuilated appearance. 



Found in the Boysian cabinet. 



Shell fub-pellucid, white, and taper, with five or fix mo- Insculptus, 

 derately convex fpires, finely and regularly (■ i iated through- 

 out, in a fpiral dire6tion : apex obiiufely pointed : aijerure 

 fub-ovate : pillar lip with a faint duplicature forming a fub- 

 u .bilicus;»and funiiihed with afmali tooth, 



R Length; 



