156 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 39. 



differs from this in the sculpture of the nucleus, which in sujiralirata 

 is very pronounced, and also in the strength and disposition of the 

 varices, sui^ralirata usually having them form continued ridges from 

 whorl to whorl. The spiral sculpture is also much stronger in this 

 than in the new form. 



This species is named for the late Miss Jean O'Connor, from whom 

 over 2,500 specimens of this shell were received, collected by the late 

 Capt. H. E. Nichols. 



Specimens examined. 



Cat. No. 



199178 



127541 



105472 



105473 



105556 



182565 (type). 



4066b 



149344 



46178 



126770 



128226 



Locality. 



San Diego, California , 



San Hipolite Point, Lower California (shell drift) 



Point Abreojos, l/ower California (shell washings) 



Scammon's Lagoon, Lower California , 



Scammon's Lagoon, Lower California (on sand beach). 



Margarita Bay, Lower California 



Cape San Lucas, Lower California 



Gulf of California 



do 



.do, 



San Jose Island, Gulf of California. 



Number 

 of speci- 

 mens. 



1 

 3 

 3 

 1 

 2 

 191 

 1 



99 



2 



2,385 



56 



