410 Mr. A. Adams on new Molluscafrom 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 Littorinida. 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, pallide fusca ; anfractibus 4J-, convexis 

 cingulatis, anfractu ultimo cingulis septem transversis elevatis 

 rotundatis, interstitiis longitudinaliter elevatim striatis cincto ; 

 labro margine dentato. 



Hab. OffMino-Sima; 63 fathoms. 



Conradia carinifera, A. Adams. 



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

 rotundatis, supremis Isevibus, anfractu ultimo carinis quinque 

 transversis lamellosis distantibus cincto, interstitiis longitudinaliter 

 striatis ; labro margine fimbriato. 



Hab. OffMino-Sima; 63 fathoms. 



Conradia clathrata, A. Adams. 



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

 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 acuto, 

 integro. 



Couthouyia decussata, A. Adams. 



C. testa ovata rimata, tenui, sordide alba ; anfractibus 4|, rotundatis, 

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

 sura umbilicali lira semilunari extus marginata. 



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



