262 NORTH-CAROLINA GEOLOGICAL SURVEY. 



MARGINELLA ELEVATA. N. S. (Fig. 238.) 



The thickened outer lip and the plaits of the inner, show 

 this to belong to the genus marginella, though it has a close 

 resemblance to an oliva in the elevation of the spire ; whirls 

 four. 



ERATO LAEVIS? (Fig. 139.) 



Shell obtusely ovate ; wide at the base of the spire ; spire 

 depressed ; both lips crenulate, but most distinct upon the 

 outer lip ; resembles very closely a marginella. Miocene 

 marl of Cape Fear river. (Rare.) 



It is difficult to distinguish this from the English species 

 with the aid only of figures. It may be indentical, and I have 

 therefore referred it to the English species. 



FAMILY YOLUTIDAE. 



The volutes have a thick, short ornamented shell. The 

 spire is particularly so, and it is also provided with a mamil- 

 lated apex. Aperture is large and elongated, and the colu- 

 mella has several plaits. 



VOLUTA MUTABILIS. CON. 



The shell is fusiform and thick, and has a conical spire and 

 a papillated apex ; whirls, convex and contracted near the 

 sutures, and the two principal whirls are ornamented with 

 short ribs ; lines of growth distinct, and crossed by faint re 

 volving lines ; plaits, two and rather distant, and faint indica 

 tions of an intermediate one. Found in the miocene of the 

 Cape Fear river. 



VOLUTA TRENHOLMH: TUOMEY & HOLMES, FOSSILS OF SOUTH-CAR 

 OLINA, p. 128. (Fig. 140.) 



&quot; Shell fusiform, ventricose ; whirls compressed above, spi 

 rally and transversely striated ; striae wrinkled and coarse at 

 base; spire short and sub-cancellated, papillated; aper 

 ture semi-lunar ; outer lip acute, smooth within ; columella 

 lip very thin, decumbent, almost obsolete, semi-callous, not 

 distinguishable from the body-whirl, but by outline and color. 



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