32 CALIFORNIA ACADEMY OF SCIENCES [Pkoc. 4th See. 



EXPLANATION OF PLATE 6 



Fig. 1. Mopalia egretta Berry. Dorsal view of tvpe specimen 

 [281]:x5j4. 



Fig. 2. Mopalia egretta Berry. Left side of valves ii-v and adjacent 

 region of girdle of paratype [284] : x 15. 



