- 3 - 
Collecting was performed whenever possible. Use of the small skiff 
whenever weather conditions permitted was made during several long ocean¬ 
ographic stations. Oil slicks were usually spread during these times in 
attempts to attract storm petrels as well as other species. Throughout 
the cruise 149 birds were collected; the majority of these were storm 
petrels of two species. Preparation of specimens at night occupied so 
much time that nocturnal observations were not held. Spot checks were 
made to ensure that species different from those recorded during diurnal 
observations were not being missed, but these times were not recorded. 
Because of the time needed to wriue the present report, only a few 
hours daily of observation time were conducted during the return coastal 
run between Manzeinillo and San Diego, Considerable observations have 
been conducted through this area and in fact reliable density estimates 
cannot be made viienever the ship is close to land. 
The present cruise has been divided into sections according to the 
water types listed below, -^n most cases these water masses do not appear 
to be distinct boundaries for bird species. However, since we are dealing 
\ri.th pelagic species, subdivision by natural oceanic zones seems more ap¬ 
propriate than arbitrarily chosen lines. Delineation of the various cvir- 
rents was made from analyzation of oceanographic data. 
AREA A. COASTAL VOTERS 
Time span: 20-27 Feb, and 29 Fiarch-5 April. 
All coastal waters to 150 miles from shore from San Diego to Pianzariillo 
and return are included in this area. Several different water types are 
undoubtedly included here as suggested by the distribution of certain pel¬ 
agic bird species, but the usual land based species dominate throughout. 
Large flocks of mixed Sooty Terns and Townser^d's Shearwaters were encoun¬ 
tered at the mouth of the Gulf of California, 
AREA B. NORTH EQUATORIAL CURRENT VjATERS 
Time span: 28 Feb.-l March and 24—28 Mar^h. 
Boundary limits: 7® N latitude — 13*^—30 N latitude. 
Moderately high numbers of large shearwaters, large Pterodroma , Leach 
type storm petrels and Sooty Terns were encountered in this area. Some in 
fluence of Clipperton Island based species also affects this region. 
AREA C. NORTH EQUATORIAL COUNTER-CURRENT ^^TERS 
Time span: 2-3 March. o ' nr- 
Boundary limits: 4°N-7°N latitude along 105°longitude and 5 -30 N to 7°H 
along 112°W longitude. 
/ 
