Mr. A. Adams on new Mollusca from China and Japan. 137 



Genus Alvania, Risso. 



Some naturalists, of an obstructive nature, or of the " old 

 school," refuse to see any groups which are not already in their 

 mind's eye, and will insist on calling a thing a " spade " when 

 it is certainly a " rake." These small shells, according to them, 

 are species of Rissoa, of a short cancellated kind, with subcircular 

 apertures, and with the peritreme usually thickened. 



1. Alvania circinata, A. Adams. 



A. testa imperforata, elevatim turbinata, tenui, pallide rufa ; anfrac- 

 tibus A\, convexis, cingulis elevatis transversis rufo-fuscis sub- 

 nodosis ornatis, interstitiis lineis longitudinalibus, vix elevatis 

 cancellatis ; apertura subcirculari ; labio rufo-fusco tincto ; labro 

 simplici. 



Hab. Island of Sado ; 30 fathoms. 



2. Alvania semicostata, A. Adams. 



A. testa solida, imperforata, ovato-conica, sordide alba ; anfractibus 

 3|, planatis, longitudinaliter costatis, transversim liratis ; costis 

 parvis, tenuibus, distantibus, in anfractu ultimo ad peripheriam 

 desinentibus; basi spiraliter lirata; apertura ovata, postice angus- 

 tata ; labro simplici. 



Hab. Mino-Sima; 63 fathoms. 



3. Alvania tiarula, A. Adams. 



A. testa imperforata, tenui, turbinata, corneo-lutescente ; anfractibus 

 3\, planiusculis, postice coronulatis et angulatis, longitudinaliter 

 costatis ; costis validis, distantibus, lirulis elevatis decussatis ; an- 

 fractu ultimo costis ad peripheriam desinentibus ; basi lirulis con- 

 centricis instructa ; apertura subcirculari ; labro simplici. 



Hab. Tabu-Sima; 25 fathoms. 



4. Alvania ccelata, A. Adams. 



A. testa ovato-conica, solida, imperforata, pallide fusca ; anfractibus 

 A\, convexiusculis, longitudinaliter costatis, transversim valde 

 liratis ; costis crassis, validis, distantibus, interstitiis liris elevatis 

 decussatis; costis in anfractu ultimo ad peripheriam terminantibus ; 

 basi valde lirata ; apertura ovata. 



Hab. Tsu-Sima; 25 fathoms. 



5. Alvania clathratula, A. Adams. 



A. testa elevatim turbinata, rimata, pallide fusca ; anfractibus A\, 

 convexis, costis longitudinalibus elevatis et liris transversis validis 

 regulariter clathratis ; liris in anfractu ultimo ad partem anticam 

 obsoletis ; basi liris validis spiralibus instructa ; apertura sub- 

 circulari. 



Hab. Tsu-Sima; 16-25 fathoms. 



