410 Mr. A. Adams on new Mollusca from Japan. 



approximates to Isapis, a genus founded by my brother and 

 myself in our ' Genera of Recent Mollusca/ but it is without 

 the plait in the middle of the inner lip. It has also relations 

 with Fossar • but the aperture is not semicircular as in that 

 genus^ nor is the inner lip straight. 



There appears to be a sufficient reason — in the possession of 

 two frontal lobes between the tentacles by the last-mentioned 

 genus Fossar, and in its habitat — to make it the nucleus of a 

 family distinct from Littoi'inida. The genus Isapis will form a 

 second member of Fossarida, and Conradia and the following 

 genus Couthouyia will be also included in it. 



Conradia cingulifera, A. Adams. 



C. testa turbinata, rimata, pallida fusca ; anfractibus 4^, convexis 

 cingulatis, anfractu ultimo cingulis septem transversis elevatis 

 rotundatis, interstitiis longitudinaliter elevatim striatis cincto ; 

 labro margine dentate. 



Hab. Off Mino-Sima; 63 fathoms. 



Conradia carinifera, A. Adams. 



C. testa turbinata, umbilicata, pallida fusca ; anfractibus quatuor 

 rotundatis, supremis Isevibus, anfractu ultimo carinis quinque 

 trausversis lamellosis distantibus cincto, interstitiis longitudinaliter 

 striatis ; labro margine fimbriato. 



Hab. Off Mino-Sima ; 63 fathoms. 



Conradia clathrata, A. Adams. 



C. testa turbinata, sordide alba, anguste umbilicata ; anfractibus 3|, 

 convexis, supremis cingulatis, ultimo liris elevatis transversis et 

 costis obliquis longitudinalibus distantibus clathrato, interspatiis 

 longitudinaliter elevatim striatis ; apertura circular! ; labro mar- 

 gine extus incrassato, intus Isevi. 



Hab. Straits of Korea ; 63 fathoms. 



Genus Couthouyia, A. Adams. 



Testa ovata, profunde et late rimata ; spira acuminata ; anfractibus 

 convexis, decussatis, anfractu ultimo ventricoso, suturis impressis. 

 Apertura semi-ovata ; labio recto, angusto, libero, antice dilatato ; 

 rima umbilicali elongata ; labro simplici arcuato, margine acute, 

 integre. 



Couthouyia decussata, A. Adams. 



C. testa ovata rimata, tenui, sordide alba ; anfractibus A\, rotundatis, 

 lineis longitudinalibus et liris transversis, elevatis, decussatis ; fis- 

 sura umbilicali lira semilunar! extus marginata. 



Hab. Off Mina-Sima ; dredged from 63 fathoms. 



