115 



Columella variable, generally abundant, elliptical, prominent 

 and formed of nuinerous contorted and eroded lamella3. 

 Length of largest specimen 44 millim. 

 Major dianieter of calicle 14 » 

 Minor » » » 11 » 



This species is very closely related to R. ovalis Semper, frorn 

 wbich it is distinguished by its more elegant sliape, by tbe fact 

 tbat the quaternary septa are more exsert and often larger tban 

 tbe tertiaries, and by tbe union of the quaternaries in front of 

 the tertiaries so as to exclude the latter from the columella. 



