86 IOWA STUDIES IN NATURAL HISTORY 
with the convex sides turned downward. Another species, similar 
in form, has corallites of much smaller size. 
The genus Pocillopora is represented by several finely branched 
species. The colonies are generally smaller than those of Acro- 
pora, but there is great diversity in the manner of branching. The 
most common form is a dense oval clump of closely aggregated 
branches; but sometimes they are delicate and slender like the 
common Acropora of the Atlantic. 
Fovites is a genus that I had not seen before. It seems to be 
an encrusting form, and the general aspect is like that of some 
of the Devonian fossils. The corallites are low and large, quite 
varied in shape, their walls contingent; in combination they form 
a sort of network of large mesh. Our specimens greatly resemble 
the figure of Cyphastrea ocellina.* Leptorta is another genus 
greatly resembling Meandrina of the tropical Atlantic. The coral- 
lites are extensively confluent and the septa all seem to belong to 
one series, instead of two as in the Atlantic Meandrina. Turbr 
naria is a foliaceous form with distinet round corallites separated 
by ccenenchyma, sometimes of considerable extent. Porites is an- 
other genus well represented on these reefs, but the specimens 
offer no important points of difference from the West Indian 
forms. 
While on Makuluva I tried preserving coral polyps in an ex- 
panded condition by a method that Dr. Vaughan has used suc- 
cessfully. My chief difficulty was getting them to expand in the 
laboratory. This they refused to do, although I tempted them 
with choice bits of crab meat which Dr. Vaughan informed me 
was eagerly devoured by the Atlantic forms with which he ex- 
perimented. 
The Orbicella mentioned on a preceding page was of intense 
interest to all of our party, as it offered a display of expanded 
polyps unique in our experience. These were brown but had a 
white area around the mouth. 
The anemones were represented by a number of interesting 
species. I have already spoken of the huge specimen that had a 
spread of something like eighteen inches, the largest any of us 
had ever seen. It had an extensively lobed, fringed disk margin 
and thousands of bright green tentacles. The body beneath the 
41 Vaughan, Recent Madreporaria of the Hawaiian Islands and Laysan, 
pl XVI, fies. 
