SCALARIA. 63 



SCALARIA. 



Sub'turreted, with longitudinal elevated sub-acute 

 interrupted ribs ; mouth rounded, entire, with a 

 reflected margin, 



S. PHETTOSA. Conic^ umbilicated, loosely 

 twisted into a spiral shape^ cream -colour^ with 

 the ribs white ; whorls disunited,, smooth ; the 

 last ventricose; up to 6. W. 31. 88. 



S. LAMELLOSA. Whitish^ imperforated^ sub- 

 turreted^ with thin white denticulated lamelli- 

 form ribs ; whorls contiguous and smooth^ the 

 last with a keel environing the base. 1. W. 

 Sup. 6. 17. 



S. COMMUNIS. Imperforate^ turreted with 

 rounded sub -contiguous whorls, and thick lon- 

 gitudinal oblique ribs ; white, with the interstices 

 of the ribs more or less striated transversely with 

 brown. U. B. W. 31. 90. 



S. FRAGiLis. Much resembles S. lamellosus; 

 but its ribs are more numerous, its texture thinner, 

 pure white ; destitute of the keel ; much smaller. 



S. RARicosTA. Turreted, perforated, white, 

 ^ith transverse most slender striae, and obsolete 



