810 Mr. A. Adams on some new Mollusca. 



Eucharis Siimpsoni, A. Ad. 



E. testa subquadrato-elliptica, compressa, alba ; umbonibus parvis, 

 acutis, antrorsum subinflexis ; valvis hispidis, concentrice rugoso- 

 striatis, ab apice ad marginem posticum valde angulatis ; latere 

 postico elongate, rotundato. 



Lat. 6 lin., alt. 4 lin. 



Hah. Inland Sea^ Akasi. 



A transversely ovate species, with the beaks sharp and inflexed, 



and with the posterior area of the whorls strongly and acutely 



angulate. 



Leptoconchus rostratus, A. Ad. 



L. testa ovato-pyriformi, tenui ; spira obtusa, alba, longitudinaliter 

 lamellosa ; lamellis confertis, undulosis ; apertura ovato-trigonali, 

 antice in rostrum acutum desinente ; labio laevi ; labro antice mar- 

 gine sinuato ; anfractu ultimo liris transversis instructo. 



Hab. Kino-0-Sima ; in Madrepores. 



This species differs from L. serratus, Iliipp._, in the lamellae 



not being serrulate ; and from L. ellipticus, Sow., in the fore part 



of the last whorl being produced into an acute beak, and in its 



pyriform shape. 



Opalia exquisiia, A. Ad. 



O. testa pyramidali, imperforata, acuminata ; anfractibus 8, planatis, 

 suturis canaliculatis ; varicibus permultis, crassis, oblique punctato- 

 striatis, ad angulum anfractuum aculeato-angulatis, interstitiis 

 transversim liratis ; basi carina cincta ; apertura circulari, varice 

 antice subangulato, postice acuminato. 



Hah. Gotto Islands; 71 fathoms. 



The only species at all resembling this is Scalaria porrecta, 

 Hinds, from the Straits of Malacca. In the species described 

 above, the varices are produced into sharp points at the sutures 

 in a very elegant manner, and are obliquely striato-punctate, 

 with the spaces between them conspicuously Urate. It belongs 

 to the group with a basal ridge, and which has received the 

 name of Opalia. 



Smaragdinella Sieholdi, A. Ad. 



5. testa ovato-oblonga,vix involuta.aperta, tenui, glauca,pellucida,dorso 

 longitudinaliter striata ; labio lamella spiral! vix dilatata instructo. 



Hah. Takano-Sima ; between tide-marks. 



This species differs remarkably from the other species of the 

 genus in the breadth of the spiral lamella which winds round 

 the inner lip. In S. viridis, S. glauca, and S. minor the lamella 

 is so broad that it forms, when it winds, a cup-shaped appendage. 

 In S. Sieholdi, however, the lamella is so narrow that a spiral 

 ridge only is visible. 



