304 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



EXPLANATION OF PLATE 39 



Figs. 

 1-4. Robulus limbosus (Reuss). X 33, p. 297. 



5. Lenticulina peregrina (Schwager). X 37, p. 302. 

 6-9. Planularia californica (Galloway and Wissler). X 33, p. 303. 



In all specimens, a, side view; b, apertural view. 



