SOTVERBY : ON NEW MAEFNE MOLLUSCA. 



177 



This species differs from Y. lanceolata, Sowerby. in being more 

 compressed, more shortly truncated, and sharply angled at the posterior 



end, and in the oblique ridges being less waved, and extending almost 

 to the posterior extremity. 



Caebita ttmbonata, n.sp. 



Testa rotundato-cordiformis, tumida, crassa, aurantiaca, rufo-fusco 

 suffusa, costis 20 crassis, rotundatis, nodulosis, instructa ; umbones 

 prominentes, valde convexi, antice incurvati ; lunula brevis, profunda ; 

 margo dorsalis postice arcuatus, declivis, antice brevissimus; cardo 

 normalis. Alt. 30, lat. 30, crass. 26 mm. 



y 



Hab. — Off Sierra Leone (Admiral Keppel). 



A robust shell of a peculiarly tumid form, with very broadly rounded 

 umbones. Perhaps the nearest approach to it in form is C. Cuvieri, 

 Broderip. 



VOL. VI. — SEPTEMKER, 1904. 



13 



