192 
PACIFIC SCIENCE, Vol. XI, April, 1957 
A complete report on the ecological study 
is in preparation by Dr. Hiatt. For this report 
on a small section of his collections, loaned 
to me for this study, Dr. Hiatt has permitted 
me to extract and summarize the following 
information from his field notes about the 
zones and specific habitats of the shrimp: 
E-l-2. Section XI, seaward reef. Slope be- 
yond edge of reef flat, about 450 feet from 
shore. Reef face at an angle of about 60°. 
82 species of coral collected down to depth 
of 30 feet, no species being dominant. Al- 
pheids commensal with Antedon , a sea lily 
found clinging to the underside of coral 
ledges. 
E-l-106. Section III, seaward reef. 50-100 
feet from beach. Level about that of mean low 
water (0.0); on low tides area with dry areas 
and shallow pools. Corals not flourishing, 
Montipora gaimardi the dominant species. 
Sand and coral fragments in depressions. Al- 
pheids in interstices of M. gaimardi. 
E- 1-122. Section IV, seaward reef. 100-150 
feet from beach. In general similar to Section 
III, about same level. Alpheids as in Section 
III. 
E-l-149. Section V, seaward reef. 150-200 
feet from beach. Inner portion alone exposed 
on extreme low water, outer portions covered 
by 2-5 inches of water. Level of extreme low 
water marks division between M. gaimardi 
and Acropora pectinata zones. Alpheids as in 
Section III. 
E-l-285, 290. Section VI, seaward reef. 
200-250 feet from beach. Water standing at 
all tides, reef flat bare with no loose sand. 
Zone with mixed M. gaimardi and A. pectinata. 
Alpheids in group 285 collected from living 
heads of coral and in holes in dead coral, and 
in group 290 from living heads of Pocillopora. 
E-l-305. Collected from a brackish pond 
on Malel Island. 
E-l-306. Section VII, seaward reef. 250- 
300 feet from shore. At tides below 0.3, tips 
of growing heads of coral exposed. A. pec- 
tinata dominant coral, covering much of area; 
Pocillopora luxuriant. Alpheids from dead 
bases and living branches of coral; some from 
living heads of Pocillopora. 
E-l-387, 388. Section VIII, seaward reef. 
300-350 feet from shore. Highest parts of 
corals exposed only on extreme low waters. 
A. pectinata dominant with Pocillopora sec- 
ondary; a brown alcyonarian, Lohularia kremp- 
fi, also occurring in numbers. Alpheids col- 
lected from heads of Acropora and Pocillopora. 
E-l-611, 630, 643, 648. Section IX, seaward 
reef. 350-400 feet from shore. Section similar 
to Section VIII, the depth slightly greater and 
area commonly flooded with foam from surf 
much of day. A. pectinata and Pocillopora still 
dominant corals. Alpheids collected from 
heads of Acropora (617,643), Pocillopora (619, 
630), and Stylophora (648). 
E-l-670. Section II, seaward reef. From 
edge of water at mean high tide to a point 
80 feet seaward. Exposed beachrock pitted 
and covered with fine, short algae; area marked 
by large tide pools varying from 4 to 8 inches 
deep. Alpheids collected from tide pool. 
E-2-169, 311. Section II, lagoon reef. From 
mean high tide level to 100 feet towards the 
lagoon. Outer margin uncovers at 0.0 tide. 
Covered with quite smooth beachrock, with 
a few shallow tide pools; outer portions cov- 
ered by a fine sand veneer. No corals present. 
Alpheids collected under loose slabs of beach- 
rock (169) and in holes in the rock (311). 
E-2-343, 382. Section IV, lagoon reef. 
From 200-300 feet from shore, depth from 4 
to approximately 60 feet. Area with bottom 
covered with sand and coral rubble, and nu- 
merous species of coral with those of the ge- 
nus Acropora dominant. Alpheids collected 
from heads of Seriatopora hystrix (343) and 
Stylophora (382). 
E-2-360. Section III, lagoon reef. From 
100-200 feet from shore. Depth from 0.0 to 
4 feet. Section of bottom covered with fine 
sand and coral rubble; luxuriant growth of 
corals with species of Acropora dominant. 
Alpheids collected from Stylophora mordax. 
