147 



SUBTRUNCATA. Mont. p. 300. t. 10. /. l.Turt. 

 D. no. 64. TURRITELLA S. F. p. 303. Pellucid 

 yellowish white, with six or seven rounded smooth 

 whorls separated by a deep depressed line, gradually 

 tapering to an obtuse point; aperture suborbicular, 

 inclining to oval, variety, faintly striated longitu- 

 dinally, somewhat glossy. 0,20... 0,05. Southampton 

 and Salcomb in drift sand. 



TRIBE. NERITACEA. 



Fluviatile or marine, semiglobular or depressed oval, 

 destitute of a columella ; aperture semicircular with 

 an oblique straight pillar-lip. 



GENUS. NATICA. 



Subglobular, operculated, umbilicated ; aperture en- 

 tire, semicircular ; inner lip oblique, toothless, 

 callous ; the callosity modifying the umbilicus and 

 sometimes covering it ; outer lip sharp, always 

 smooth within. 



N. MONILIFERA. Lam. 16. N. GLAUCINA. F.p. 

 319 Pen. 4. p. 344.*. 90./. 1. NERITA G.Mont. p. 

 469. List. An. Ang. t.Z.f. W. List. .568. /. 19. 

 Da Cos. p. 83. t. 5. /. 7.D. (in part) p. 978. 

 Strong, smooth, glossy, livid or purplish flesh color, 

 ferruginous or chesnut about the acute apex, paler when 

 G 2 



