253 



rably behind in the form of a small lobe ; a false um- 

 bilicus. 0,09... 0,06. Aberdeen. 



B. PELLTJCIDA. BULLINA. P. Macg. Ab. p. 334. 

 VOLVARIA P. Brown. III. Con. t. 38. /. 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. PRODUCTA. Brown. III. Con. t. 38. / 15, 6. 

 Macg. Ab. p. 335. Oblong cylindrical, thin, trans- 

 parent, glossy, hyaline white with faint lines of growth, 

 the apex slightly umbihcated ; aperture extremely 

 narrow, the outer lip forming a narrow sinus projecting 

 considerably beyond the apex. 0,23 ... 0,1 1 . Aberdeen. 



NATICA RUTILA 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 whorls is sharply inflexed, the base 

 paler ; spire very short and convex ; suture channelled 

 but narrow ; whorls four, very convex, longitudinally 



