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and sometimes covering it; right lip acute, always smooth inside. An 

 operculum. 



N. glaucina, 

 ' albumen, 



N. caurena, 

 ' cruentata, 



N. unifasciata, 

 ' lineata, 



N. zonaria, 

 ' Chinensis, 



* mamillaris, 



' mamilla, 



' melanostoma, 



' millepunctata, 

 ' vitellus, 

 ' helvacea, 



' fulminea, 

 ' maculoso, 

 ' vittata, 



' Javanica, 

 ' cancellata, 

 ' patula, 



' aurantia, 



' collaria, 



' castanea, 



' duplicata, 



' conica, 

 ' plumbea, 

 ' ampullaria, 



' monilifera, 

 ' labrella, 

 ' rufa, 



' Marochiensis, 

 ' arachnoidea, 

 ' zebra, 



' intricata, 

 ' glabra. 





IANTHINEA. 





Ianthina. Shell ventricose, conoidal, thin, transparent; aperture trian- 

 gular; columella straight, passing beyond the base of the right lip, which has 

 a sinus in the middle. No operculum. 



I. communis, I. exigua. 



MACROSTOMIANA.— Four Genera. 



Shell ear-shaped, the aperture much dilated, the margins disunited, no col- 

 umella, no operculum. 



Sigaretus. Shell subauriform, nearly orbicular; the left lip short and 

 spiral; aperture entire, much dilated, rounded, oblong; the margins not united. 



S. haliotoideus, S. concavus, S3, laevigatas, S. cancellatus. 



Stomatella. Shell orbicular, oblong, ear-shaped, imperforate; aperture 

 entire, large, sublongitudinal; right lip effuse, dilated, open. 



S. imbricata, S. sulcifera, S. auricula, S. planulata. 



' rubra, 



Stomatia. Shell ear-shaped, imperforate, spire prominent; aperture 

 entire, large, oblong; right margin and columella equally raised; a transverse 

 and tuberculated rib on the back. 



S. phimotis, 



S. obscurata. 



Haliotis. Shell ear-shaped, mostly flattened ; the spire very short, 

 sometimes depressed, nearly lateral; aperture very large, ovate oblong, and 



