2 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
Island (Reish, 1964). All of these Californian embayments have 
been altered to some extent by man so that the aboriginal faunas 
are unknown; presumably the biotas have been modified by the 
introduction of cosmopolitan bay forms (Barnard, 1961), by means of 
shipping, oyster culture, and other transmitting agents. 
Description oF Morro Bay.—Morro Bay (fig. 1) lies on the 
southern middle portion of the California coast, just north of the 
Zz 
Te) 
° 
fo} 
N 
35°2I' W 
MORRO BAY, CALIFORNIA 
station locations 
2000 feet 
scale 
Ficure 1.—Station locations of benthic survey, August 25, 1960. 
zoogeographical boundary of Point Conception. Open-sea water 
temperatures approximate the southernmost extension of cold- 
temperate conditions and the rainfall is sufficient to permit a slight 
dilution of bay waters. This situation is in contrast to the embay- 
