MELANIIDyE. 293 



Species of Ceritlildea. 



ambigua, C. B. Adams. lineolata, Kien. 



Chai-bounien, Petit. Moiitagiiei, D'Orh. 



costata, Lam. obtusa, Lam. 



clecollata, Linn. pulchra, C. B. Aday^is. 



fragilis, Gray. scalariformis, Say. 



Hegewischii, Phil. servilis, C. B. Adams. 



iostoma, Pfeiff. Sinensis, Phil. 



Kieneri, Homb. and Jacq. varicosa, Sow. 

 Lafoncli, Mich. 



Sub-gen. pirenella, Gray. 



Shell turreted ; whorls granular, or with irregular ribs and 

 varices; aperture rounded, with a short canal in front ; inner lip 

 simple ; outer lip thin, sinuated. 



bicariuata, Gray. conica, Blainv. 



cferulescens, Metcalfe. Diemenensis, Quay. 



Caillaudi, Pot. and Mich. Largillierti, Phil. 



cinerascens, Pau. mamillata, Phil. 



Fam. MELANIID^. 



Lingual membrane long and linear ; teeth in seven 

 series (S'l'S), the lateral teeth uncinate, multicuspid. Ros- 

 trum broad, annulated ; tentacles subulate, with the eyes 

 on bulgings at their outer sides. Mantle-margin fringed, 

 with a rudimentary siphonal fold in front ; gill composed 

 of rigid, cylindrical plates. Foot broad and short, angu- 

 lated in front. 



Operculum horny, ovate, subspiral. 



Shell spiral, turreted, covered with a thick, dark-co- 

 loured epidermis ; aperture often channelled or emargi- 

 nate in front; outer lip simple. 



