360 



PROCEEDINGS OF THE MALACOLOGICAL SOCIEXr. 



testae sequans, rotuude convexus, basim versus paulo attenuatus ; 

 apertura ovalis, intus fusco-piirpiirea ; peristoma tenue. Long. 50, 

 lat. 40 ; apertura, long. 32, lat. 19 mm. 



Rah. — Costa Rica. 



A shell of simple symmetrical form, its greatest width being about 

 the middle, with the anterior and posterior ends nearlj^ equal. The 

 whorls are smoothly rounded, without sutural depression, but 

 separated by an exceedingly narrow suture. The prevailing colour 

 is brown, but tinged here and there with purple, particularly about 

 the spire. The interior of the aperture is deep brownish purple. 



The type-specimen came from the collection of the late S. I. Da Costa. 



Ampullakia avellana, n.sp. 



Testa ovalis, mediocriter umbilicata, tenuiuscula, longitudinaliter 

 striato-plicata, fusco-olivacea, lineis fuscis plus minusve obscuris 



fasciata ; spira breviter gradata ; anfractus 4, penultimus rotundatus ; 

 ultimus I longitudinis testae tequans, ovatus, convexiusculus, ad 



