SOWERBY : ON NEW MARINE MOLLUSCA. 281 



angustis, rotundatis, posticis latioribus, anticis duplicatis, latiusculis. 

 Umbones rotundati, incurvati, approximati ; lunula elongato-cordi- 

 formis, distincta, nigro-fusca ; ligamentum angustum, immersum ; area 

 ligamenti concave impressa. Margo dorsalis utrinque obtusissime 

 angulatus ; posticus longiusculus, subrecto-declivis ; anticus abbrevi- 

 atus, incurvus ; margo ventralis rotunde arcuatus. Pagina interna 

 Isevis, alba, violaceo tincta, ad marginem subtiliter crenulata. 



Lat. 42, alt. 36 mm. 



Hah. — Off Sierra Leone. 



In form this shell closely resembles V. declivis, Sowerby, which 

 species Admiral Keppel dredged in the same locality. The concentric 

 lamellae are more numerous and less elevated, excepting at the sides. 

 The species is further distinguished by its close radiating riblets, 

 which are much narrower and closer than in the West Indian 

 V. cancellata. 



DiPLODONTA AXJRICULATA. Fig. 2, 



Testa subquadrato-TOtundata, aequivalWs, insequilateralis, alba, laevi- 

 gata, concentrice sub-obsolete striata, postice late rotundata, antice 

 leviter contracta. Margo dorsalis anticus breviter declivis, posticus 

 rectus, auriculatus ; margo veatraUs valde arcuatus. Caixlo normaUs. 



Lat. 21, alt. 19 mm. 



Hob. — Sierra Leone. 



This shell is distinguished hy a well-defined posterior auricle ; it is 

 otherwise so like the British D. rotundata that it might have been 

 taken for a monstrosity, were it not that two specimens, exactly alike, 

 were tal<en at the above locality, and that there is a third in the 

 British Museum. 



Protoma ptjlchra. Fig. 5. 



Testa elongate - turrita, albida, strigis maculisque f uscis ornata ; 

 anfractus 19, convexi, primi 2 minuti, laeves, caeteri bicarinati, deinde 





liris 2-4 angustis, bic illic albo at f usco artieulatis, instructi ; anfractus 

 ultimus i longitudinis testae aequans, sex-liratus. Apertura sub- 

 quadrata ; columella tenuis, arcuata ; labrum tenue, antice truncatum, 

 late et profunde sinuatum. 

 Long. 37, diam. maj. 8^^ mm. 



