NORTH-CAROLINA GEOLOGICAL SURVEY. 259 



OLIVA; LAM. STREPHONA; BROWN. 



The olives are shells of great beauty, being highly polished 

 and covered with a porcellanous enamel, the surface of which 

 is marked by spots and bands of a great variety of colors. 

 The shell is cylindrical, dense and heavy ; the spire is short, 

 with channelled sutures, and the aperture long and narrow ; 

 the anterior part is notched ; the columella is callous and stri- 

 ated obliquely. The body- whirl is furrowed near the base. 

 The olives are the inhabitants of warm climates, and are very 

 active. 



OLIVA LITERATA. SAY. (Fig. 130.) 



Shell cylindrical, thick and polished ; spire depressed ; vo- 

 lutions angular and channelled ; apex acute ; outer lip sharp, 

 inner marked with numerous sharp folds; aperture linear, in- 

 cised above and notched below. 



This shell is very common in many of the miocene marl 

 beds in the State. It is also living and common on the coast. 

 The fossil frequently retains the polish of the living shell ; the 

 colors have disappeared. 



OLIVA ANCILLARIAEFORMIS. LEA. 



Shell small, oval, thick, and polished ; spire elevated, acute ; 

 suture channelled ; aperture narrow ; inner lip thickened by 

 callus and marked by a few obscure folds. 



The foregoing description applies to a small oliva, with a 

 large amount of callus upon its inner lip ; but it appears to be 

 a thicker shell than the one to which I have referred it. It 

 is the most common upon the Cape Fear river. 



OLIVA. 



An oliva, (fig. 131a,) larger than the preceding, and more 

 cylindrical) and having a higher spire, is occasionally found in 

 the miocene beds of the Cape Fear. It has six whirls, and 

 the folds upon the inner lip extend to the suture. 



OLIVA CANALICULATA. LEA. 



With this addition to the olives, we have four or five species 

 belonging to the miocene period. 



