OF CONCHOLOGY. 67 



This shel] differs from all the recent species of Volutella in its 

 slightly prominent spire, and especially in its greatly thickened 

 labrum, with its large thick stria on the inner margin. 



FRUNUM, Martini. 

 Section I. — Labrum entire. 



P. Bella, Conrad.— PI. 6, fig. 4. 



Description. — Subelliptical, elongated ; spire prominent, coni- 

 cal ; aperture narrow above ; internal margin of labrum much 

 incurved above the middle. 



P. bella, Conrad, Proc. A. N. S. 1862, p. 564. 



Locality. — Day's Point, James River, Va. 



P. Virginiana, Conrad. — PL 5, fig. 4. 



Description. — Ovate; spire short; body whorl with a subovate 

 callus on the front, extending to the labium margin and to the 

 suture of the body whorl. 



Locality. — Occurs with the preceding species. 



Section II. — Labrum crenulated within. 



P. limatula, Conrad. — Plate 6, fig. 5. 



Description. — Ovate ; spire very short ; labium thickened ; 

 callus on the upper part of the body whorl narrow, continuous 

 with the labrum margin over the summit of the aperture. 



Marginella limatula, Conrad, Journ. Acad. Nat. Sci., vol. vii, 

 p. 140. 



Locality. — Suffolk, Va. 



I am unable to distinguish this species from the recent Margi- 

 nella roscida, Redfield. 



P. eburneola, Conrad. — PL 5, fig. 1. 



Description. — Subfusiform ; spire elevated, conical, volutions 

 rounded ; labrum straight, the upper denticle largest ; columellar 

 plaits large, distant, the upper one situated above the middle of 

 the columella ; labium forming a continued rim round the base. 



Marginella eburneola, Conrad, Journ. Acad. Nat. Sci. vol. vii, 

 p. 141. 



Locality. — Suffolk, Va. 



