203 



Natica ampullaria 



Natica liueata 



canrena 





fulminea 



cruentata 





maculosa 



millepunctata 





vittata 



vitellus 





castanea 



helvacea 





Marochiensis 



collaria 





arachnoidea 



monilifera 





• zebra 



labrella 



rufa 









• Chinensis 



uni-fasciata 





• Javanica 



Natica cancel lata 



. 



. : fm> 



JANTHINA. 



HELIX JANTHINA. LiniUCUS. 



Sowerbys Genera, No. 5, plate 3. 



This singular marine shell was classed by Linnaeus 

 with the Helices, all of which are terrestrial. The 

 Janthina is only in general form like the Helix, but 

 differs in every other respect from that or any other 

 genus. The shell is extremely thin and fragile, trans- 

 parent, and of a beautiful violet color throughout its 

 substance: the form is round and ventricose; whorls 



