12 PROCEEDINGS OF THE NATIONAL MUSEUM VoL, 120 
MATERIAL.—Stations 9(2), 12(1), 13(1), 15(15), 18(125), 20(1), 
21 (6), 2281). 
Disrrinution.—Heretofore known only from southern California 
and San Quintin Bay, Baja California. 
Family Sabellidae 
Chone infundibuliformis Kréyer 
Chone infundibuliformis Kréyer, 1856, p. 33.—Berkeley and Berkeley, 1952, p. 133, 
figs. 252-253.—Pettibone, 1954, pp. 338-339, figs. 39a-j. 
MATERIAL.—Stations 7(7), 10(88), 11(29), 12(1), 14(2), 17(7), 
18(1), 19(89), 20(69), 22(4). 
DistrirputTion.—North Atlantic, Arctic, British Columbia, Cali- 
fornia. 
Family Serpulidae 
Subfamily Spirorbinae 
MATERIAL.—Stations 12(8), 15(512), 16(8). 
Remarks.—No attempt was made to identify these specimens. 
Many were observed attached to blades of the eel grass Zostera marina. 
THe AmpPHIPOD FAUNA 
In contrast to the other well-known bays of the Californias, Bahfa 
de San Quintin and Newport Bay, the amphipod fauna of Morro Bay 
is characterized by several boreal elements and by a few species 
associated with brackish water. Although the waters of Morro 
Bay were not brackish at the time of this survey, the presence of 
Corophium spinicorne and the abundance of C. wenor and C. ache- 
rusicum suggest a history of dilution. Of course these species may 
also be linked with environments which are abnormal in factors other 
than dilution, such as natural and artificial pollution and wide ranges 
in thermal regime. ‘The boreal elements known to occur in the Morro 
Bay fauna, such as Ampithoe lacertosa, Allorchestes angustus, Aoroides 
columbiae, Pontogeneia rostrata, Ampithoe valida, and possibly Hohaus- 
torius washingtonianus, which are lost or diminished in Newport Bay 
(Barnard, 1959) and Bahia de San Quintin (Barnard, 1964), may not 
be due so much to the supposed increase in average temperatures of 
the southern bays as they are to the greater yearly range of tempera- 
tures there. 
An analysis of the ecological and zoogeographical distribution of 
the amphipod species encountered showed that all of the species have 
been derived from the open sea, or have had to find a pathway through 
it. Of all species encountered, Corophium spinicorne is the most firmly 
bound to estuarine conditions. Those species that are considered as 
primarily of estuarine habit, because of the absence or near absence of 
