SHELLS 



OF THE 



NORTH PACIFIC EXPLORING EXPEDITION, 



COMMANDERS RINGGOLD AND RODGERS; 



MOSTLY COLLECTED 



BY WILLIAM STIMPSON. 



Succinea LAUTA. Testa magna, tenuis, plerumque S. obli- 

 qua3 similis, sed postice tumidior, ad apicem minus acuta. Long. 

 T 8 ij; lat. T 5 5 poll. On shrubbery at Hakodadi (Isl. Jesso). 



A very large, thin shell, most like S. obliqua, Say. W. S. 



Vitrina imperator. T. magnifica, fragilis, ventricosa, epi- 

 dermide rigida fuscescente induta, obsolete spiraliter striata ; anfr. 

 S-\-. Apertura ampla subcircularis, ad columellam vix incras- 

 sata. Axis f ; diam. 1^ poll. 



Inhabits Hong Kong in ravines near summits of hills. W. S. 



By far the largest species yet described ; approximates closely 

 to H. ampulla, Bens. 



Helix l^eta. Testa tenuis, lucida, subglobosa, viridi-cornea, 

 vitta rufa ad peripheriam et altera prope suturam ornata ; anfr. 5 

 ventricosis, striis volventibus tenuissimis. Apertura magna,' sub- 

 circularis, peristomate modico, everso, ad umbilicum magis reflexo. 



Axis 1 ; diam. 1^- poll. 



Inhabits Hakodadi on bushes and shrubs. "W. S. 



General outline not unlike H. pomalia. 



Helix labilis. T. parva, tenuis, nitida, succinea, depressa, 

 lenticularis ; ad peripheriam acuta ; subtus convexa, polita, arete 



