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Columbella dorsata. Col. tcstd oblongo-pyramidali, alba, lineis 

 irregularibus,flexuosis, confertis, castanets obtectd ; anfractibus 8, 

 lievibus, superne turgidulis j ultimi lateribus inflatis, dorso promi- 

 nente ; suturd distinctd ; aperturd angustd, jiexuosd, albd ; peri- 

 trcmate extus incrassato ; labio columellari exarato : long. 1, 

 lat. ±poll. 

 Hab. ad oras Columbia?. (Island of Muerte, Bay of Guayaquil.) 

 This species is somewhat like Col. gibberala, but it is much larger, 

 and the middle of the columellar lip is worn awayj there are also 

 other minor differences. — G. B. S. 



