569 



versim striata ; spira depressa, amfractibus quatuor ; apertura 

 liueari, in medio coarctata, antice dilatata ; labro postice producto, 

 pariim recedente, in medio inflexo, antice tuberculo unico ; colu- 

 mella uniplicata. 



Shell cylindrical, apex subtruncated, white, solid, shining, trans- 

 versely striated ; spire depressed, whorls four ; aperture linear, 

 contracted in the middle, anteriorly dilated ; outer lip posteriorly 

 produced, a little receding, rehexed in the middle, anteriorly 

 with a single strong tubercle ; columella with a single plait. 

 China Sea. Mm. Cuming. 



21. Bulla olivula (pi. cxxi. f. 34), Adams. 



B. testa cylindrico-fusiformi, solida, alba, nitida, striis punctato- 

 undulatis, spiralibus, transversim sculpta ; spira elevato-acuminata, 

 anfractibus quinque, sutura angusta, lamina spirali vix manifesta ; 

 apertura lineari, antice dilatata, labro in medio subinfiexo ; colu- 

 mella arcuata, ad basin valde uniphcata. 



Shell cylindrical, fusiform, solid, white, shining, transversely 

 engraved with punctated undulating spiral striae; whorls five, 

 suture narrow, spiral lamina hardly visible ; aperture linear, 

 dilated anteriorly, outer lip somewhat indexed in the middle ; 

 columella arched, with a single strong plait at the base. 



West Indies. Mas. Cuming. 



22. Bulla cinctella (pi. cxxi. f. 35), Adams. 



B. testa cylindrico-fusiformi, apice acuminata, sublsevi, semi- 

 pellucida, longitudinaliter sulcata, fasciis duabus, albis, spiralibus 

 cincta ; spira. acuminata, anfractibus quatuor, primo prominente ; 

 apertura angusta, antice dilatata ; columella plica valde distincta ; 

 rima, umbihcali profunda. 



Shell cylindricaily fusiform, apex acuminated, rather smooth, 

 semipellucid, longitudinally sulcated, encircled with two white 

 spiral bands ; spire acuminated, whorls four, the first prominent ; 

 aperture narrow, anteriorly dilated ; columella with a very distinct 

 plait ; umbilical fissure deep. 



China Sea. Mus. Cuming. 



23. Bulla gracilis (pi. cxxi. f. 36), Adams. 



B. testa cylindrico-fusiformi, gracili, semipellucida, cornea, 

 vertice acuminata, transversim striis minutissimis spiralibus 

 sculpta ; spira, producta, acuminata, anfractibus quatuor, primo 



