503 



tion only vifible : centre umbilicated : bafe very little 

 fpreading : aperture orbicular. Diameter about one 

 eighth of an inch. 



This fpecies is not uncommon on the flate rocks at 

 Milton, and fometimes on the under fide of loofe frag- 

 ments, in company with 5. Iieterojlropha. It is a much 

 flronger fliell than 5. Spirilluvi, and never expofes fo 

 much of the interior volution ; and, though more w'xm- 

 kled, polfeffes a fuperior glofs, when cleared from ex- 

 -traneous matter. 



Animal orange-red, with eight, greenifli, ciliated rays ; 

 and a fub-funnel fliaped probofcis, of the fame colour. 



^ 6. 



S. tefta regulari rotunda pellucida, tribus anfraflibus. Lin. Cornea. 

 Trans, v. t, I. f 33. 34. 35. (Achms.) 



Obs. Brownifli horn-colour. 



Shell regular, rounded, pellucid, with three whorls. 

 TiLrt. Lin. iv. p. 6o8. 



S. with a flrong, fpiral (liell, of a dull dirty-white HEXEROsTKa- 

 colour, with two or three reverfe volutions placed late- pha. 



rally, furnifhed with three longitudinal ridges, one 

 along the back, and another on each fide, roughly wrin- 

 Jiled tranfverfely.: the bafe is flat, and fomewhat fpreaS- 



in.g.: 



