70 AMERICAN JOUENAL 



ovate ; lip thickened within ; ridges red, interstices whitish, 

 columella and apex white. 



Alcyna STRIATA, Pease. 



T. elevato-turbinata, solidiuscula, anguste perforata, trans- 

 versim impresso-striata ; anfr. 4, infra suturam angulatis ; aper- 

 tura ovata ; labro intus vix incrassato ; cinereo, nigroque macu- 

 lata et punctata, ad suturam albida. 



Alt. 2. Diam. li mill. 



Hab. Insl. Hawaii. 



Shell elevately turbinate, rather solid, narrowly perforate, 

 transversely impressly striate ; whorls 4, angulate beneath the 

 suture ; aperture ovate ; outer lip slightly thickened within, 

 speckled and mottled with black and grey of different shades, 

 whitish beneath the sutures. 



Including the above, four species of this genus are known as 

 inhabiting the Hawaiian Islands. They agree in all their char- 

 acters with genus Leptotliyra, excepting the distinct prominent 

 tooth at termination of the columella. 



Leptothyra costata. Pease. 



T. crassa, turbinata, anguste perforata ; anfr. 4, transversim 

 eostatis, medio angulatis, costis mediis maximis, longitudinaliter 

 tenui striatis ; apertura subobliqua, fere circularis ; albo, nigro, 

 fuscoque maculata et punctata, apice alba. 



Alt. 3. Diam. ^ mill. 



Hah. Insl. Maui. 



Shell thick, solid, turbinate, narrowly perforate ; whorls 4, 

 transversely ribbed, angulate at the middle, ribs largest at the an- 

 gulation and below, longitudinally finely striate ; aperture some- 

 what oblique, nearly circular ; mottled and spotted with white, 

 black and brown, apex white. 



Nassa nucea. Pease. Plate viii, fig. 7. 



T. crassa, ponderosa, ovata ; spira brevis, convexa ; anfracti- 

 bus plano-convexis, undique costis longitudinalibus, sulcis trans- 

 versa decussatis, costis parvis, confertis, vix arcuatis ; anfr. 

 ultimo convexior, J longitudinis testse superans, basi sulcata ; 

 ad suturas anguste marginata ; apertura oblongo-ovata, colu- 

 mella, labroque valde liratis ; labro varicoso ; canali lato ; omnino 

 rufescente fusca. 



Long. 12. Diam. 7 mill. 

 Hah. Insl. Carolinensis. 



