w ies “e Fe 5 y a aera. be 
= +. cao “ih are - a ~ pm) 
194 SHELLS OF SAN PEDRO BAY —WILLIAMSON. 
Family ANOMIID 2. 
Genus PLACUNANOMIA Brod. 
Subgenus MoniaA Gray. 
Placunanomia (Monia) macroschisma Desh. 
Single valves rare. One fine example, measuring 34 by 3 inches, has 
been reported by Miss Eleanor B. Green, of Minnesota, who informs me 
that this shell, found alive at Long Beach, varies considerably from 
the type. ‘The shell varies much like an oyster.” (J. G. C.) 
Genus ANOMITA Linné. 
Anomia lampe Gray. 
Odd valves and two young shells reported. 
SCAPHOPODA. 
Genus DENTALIUM Linné. 
Dentalium hexagonum Sby. 
Empty shells in the sand at Rattlesnake Island. 
Dentalium pretiosum Nuttall. 
With the last, but more plentiful. 
PTEROPODA. 
Family CAVOLINITID. 
Genus CAVOLINIA Abild. 
Cavolinia tridentata Forsk. = Hyalea tridentata, of authors. 
Three or four of these little Pteropods have been washed ashore at 
Long Beach. (J. G. C.) 
Family CYMBULIID4. 
Genus COROLLA Dall. 
Corolla spectabilis Dall. 
This Pteropod has been taken alive on the surface of the sea off the 
coast north of Catalina Island. (W.H.D.) Cymbuliopsis of Pelseneer 
is synonymous. 
Family PNREUMODERMATID 4. 
Genus PNEUMODERMON Cuvier. 
Pneumodermon pacificum Dall. 
This Pteropod has been taken alive near San Pedro. (W, H. D.) 
