ho 
Qn 
Si) 
vably behind in the form of a small lobe ; a false um- 
bilicus. 0,09...0,06. Aberdeen. 
B. Petirucipa.—Buiiina. P. Macg. db. p. 334. 
—Votrvaria P. Brown. Ill. Con. t.38. f. 45,6 Sub- 
cylindrical, hyaline white, glossy, faintly striolate the 
whole length, a little wider anteriorly where it is rounded, 
apex truncate ; spire sunken, forming a wide and shallow 
umbilicus; mouth very narrow but becoming oblong 
anteriorly, and at its hind part projecting a little in the 
form of a sinus beyond the extremity of the shell. 
0,16....0,18. Aberdeen. 
B. Propucta. Brown. Ill. Con. t. 38. f 15, 6.— 
Macg. Ab. p. 335.—Oblong cylindrical, thin, trans- 
parent, glossy, hyaline white with faint lines of growth, 
the apex slightly umbilicated ; aperture extremely 
narrow, the outer lip forming a narrow sinus projecting 
considerably beyond the apex. 0,23...0,11. Aberdeen. 
Natica Rutita Mac. Ab. p. 126—Subglobose, 
rather broader than high, thick, glossy, dull greyish 
red, with a white band margining the suture at which 
the margin of the whorlsis sharply inflexed, the base 
paler ; spire very short and convex; suture channelled 
but narrow ; whorls four, very convex, longitudinally 
