281 



latter by the whorls being rolled over each other: they 

 appear more nearly to approximate the G. Marginella; 

 but the right side of the aperture is generally sharp and 

 divested of the thickened lip. Shell cylindrical, ob- 

 long; spire obsolete or concealed; aperture narrow, 

 the whole length of the shell, with one or more plaits 

 at the lower part of the columella. They are marine 

 shells, and generally very small. Sowerby in his Ge- 

 nera of Shells, No. 5, has given a plate of three fossil 

 species of this genus, two of which are not mentioned 

 by Lamarck. 



Volvaria monilis Volvaria triticea 



pallida oryza 



Volvaria miliacea. 

 [And one fossil species.] 





OVULA. 



bulla ovum. — Linn. 



Sowerby s Genera, No. 2, plate 4. 



bulla volva — Linn. 



Sowerby s Genera, No. 2, pi. 5,f. 1. The adult Shell. 



Mawe's Linn. pi. 9,% f. 1. The young Shell. 

 Bruguiere, in the first instance, separated the shells 



