LUNATIA. 



207 



epidermis ; they are not so thick and solid as the shells of 

 Natica ; nor is the umbilicus filled with a funiculus or 

 spiral callosity. The species seem to inhabit cold or tem- 

 perate, rather than tropical climates, which may account 

 for their more sombre colours; some northern forms, as 

 L, heros and L. herculea, attain to a very large size. 



Species of Lunatia. 



Alderi, Forbes. 

 algida, Gould. 

 aperta, Loven. 

 atrocyanea, Phil. 

 Buriascensis, Hecluz. 

 castanea, Lam. 

 caurina, Gould. 

 duplicata, Say. 

 fragilis, Leach. 

 Francisca, Recliiz. 

 Gallapagosa, Recluz. 

 globosa, King. 

 Grcenlandica, Beck. 

 herculea, Midd. 

 heros, Say. 

 immaculata, Totten. 

 impervia, Phil. 

 Janiaicensis, C. B. Adams. 

 lactea, Sow. 

 Lewisii, Gould. 

 livida, Lask- 



melastoma, Sow. 

 mouilifera. Lam. 

 Montagui, Forbes. 

 nana, Moll. 



pallida, Brod. and Soiv. 

 Panamana, Recluz. 

 Patagonica, Phil. 

 pisiformis, Recluz. 

 plicatula, Nutt. 

 plumbea, Latii. 

 puncticulata, Recluz. 

 pusilla. Say. 

 Piaynoldiana, Recluz. 

 rhodostoma, Phil. 

 septentrionalis, Beck. 

 soluta, Gould. 

 tenuis, Recluz. 

 triseriata, Say. 

 variabilis, Recluz. 

 violacea. Sow. 



Sub-gen. aorybia, H. and A. Adams. 



Shell globular, inflated, thin ; whorls rounded, spirally stri- 

 ated ; columella curved in the middle ; umbilicus covered by a 

 callus; outer lip very thin, flexible. 



flava, Gould. 



