NATICINA. 



211 



heaps of sand. When the animal is seen crawling, fully 

 expanded and undisturbed, the hind lobe of the foot 

 nearly covers the entire surface of the shell. 



Species of Mamma. 



alba, Montf. 

 albula, Rumph. 

 amiculata, Phil. 

 aurautia, Lam. 

 Bernardii, Recluz. 

 caudidissima, Le Gaillou. 

 Caribaea, Phil. 

 casta, Phil. 

 columnaris, Recluz. 

 Cora, B'Orh. 

 Cumingiana, Recluz. 

 Draparnaudii, Payr. 

 dubia, Recluz. 

 Flemingiaua, Recluz. 

 funiculata, Recluz. 

 fuscata, Chem. 

 intemerita, Phil. 

 mamilla, Linn. 



nitida, Donov. 

 ochrostoma, Recluz. 

 pallium, Recluz. 

 Pauamensis, Recluz. 

 perspicua, Recluz. 

 pes-elephautis, Chem. 

 pox'cellanea, D'Orh. 

 Powisiaua, Recluz. 

 pyriformis, Recluz. 

 ravida, Soiv. 

 Salangonensis, Recluz. 

 straminea, Recluz. 

 Texasiana, Phil. 

 uberiua. Valeric. 

 Vavasi, Le Guillou. 

 vestalis, Phil. 

 virgiuea, Recluz. 



Genus NATICINA, Gray. 



Shell oblong-ovate, tliin, ventricose; spire acuminate, 

 whorls transversely striated or sulcate; aperture large, 

 oblong; inner lip straight, thin, with a slight callosity in 

 the middle ; umbilicus open or partially covered. 



Ex. N. papilla, Gmelin, pi. 22, fig. 7. 



The species of this group seem intennediate between 

 Ruma and Catlnus ; they inhabit tolerably deep water, 

 and are usually of an uniform white colour; the animal 

 and operculum are not yet known. 



