GENERA OF SHELLS. 81 



Cancellaria. Shell oval or turreted : 

 aperture sub- channelled at base ; canal very 

 short or wanting. Columella plaited, the folds 

 few or numerous, for the most part transverse ; 

 lip furrowed within. 



C. reticulata, asperella, scalarina, scalariformis, nodulosa, 

 cancellata, senticosa, citharella, spirata, obliquala, rugosa, 

 ziervogeliana. 



Fasciolarta. Shell subfusiform, channelled 

 at base, without varices. Columella having 

 two or three very oblique folds near the canal. 



Distinguished from fusus by the folds on the colu- 

 mella, and from turbinella by their oblique direction. 



F. tulipa, distans, trapezium, aurantiaca, filamentosa, 

 coronata, ferruginea, Tarentina. 



Fusus. Shell fusiform or subfusiform ; 

 channelled at base, ventricose at the middle or 

 inferiorly, without varices. Spire elevated and 

 elongated. Lip entire ; columella smooth. 

 Operculum horny. 



F. colosseus, longissimus, colus, tuberculatus, Nicobaricus, 

 distans, torulosus, incrassatus, muhicarinatus, sulcatus, an- 

 îiquus, despectus, carinatus, proboscidiferus, Islandicus, mo- 

 rio, coronatus, cochlidium, corona, raphanus, filosus, poly- 

 gonoides, verruculatus, lignarius, Syracusanus, strigosus, 

 varius, crebricostatus, afer, rubens, sinistralis, Nifat, articu- 

 latus, buccinatus, aculeiformis, scalarinus,contrarius, — Cor- 

 nells, cinereus, bicolor, decemcostatus, fluviatilis. 



Pyrula. Shell sub-pyriform, channelled at 

 base, ventricose above, without varices ; spire 

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