ON MOLLUSCA OF THE WEST COAST OF XOUTH AMERICA. 



G3 



* The young shell is thin, semitransparent, with Alaboid tuberous vertex. The nuclear 

 part is rather more tumid than the next whirl, and set slanting as in some Chrt/sodomi. 

 Adolescent, whirls smooth, except a sutural line. Sculpture of adult gradually developed, 

 with spiral lines, sometimes all over, sometimes only anteriorly and posteriorly. Last 

 whirl sometimes with blunt radiating riblets, but generally smooth. Siphonal notch deeply 

 cut batt, as in Stroynbina, to which the species may belong. 



1863. jjj 



