10 A NATURALIST IN BRAZIL. 
In the rocky tide-pools of Os Busos, Guarapary, Victoria, 
Porto Seguro, etc., to Bahia, we find them quite abundant. 
There is a massive kind growing in rounded, flattened lumps 
or patches on the rocks belonging to the genus Siderastraa.* 
It has small, close-set cells, Said grows in masses often a 
foot or more in diameter, and occasionally several inches 
in height, encrusting the rocks. With this there occurs a 
little, irregularly globular coral, an inch or two in diam- 
eter, and with large, irregular, crowded cells, in which the 
radiating plates are very conspicuous (Favia, like ananas 
Edw. and Haime). In deeper water we find a large Acanth- 
astrea (A. Braziliensis Verrill)t growing sometimes in — 
round heads a foot or more in didmetin; together with large — 
bouquet-like masses, often a foot across, of a beautiful coral 
(Mussa Harttii Verrill),{ whose branches, thick and long, 
are cylindrical, forking, radiating from the same point, anil 
with the cells at the ends of the branches large and deep. 
There are several other species of hard limestone building 


* Siderastrea stellata Verrillsp. nov. Corallum forming rounded or hemispherical 
masses, often flattened above. Cells polygonal, seen large (about .15 inch) deep , the 
central part rapidly descending. Septa in Bin cycles, those of the first two cycles cote : 
ariga broadest, all of them evenly crenulated, rather thin, thickness less than the A 
intervening spaces, slightly projecting, ta inner edge tidy rounded. Columella in- 
aahhh represented only by one or two tubercles. Wall between the cells repre- 
sented by a simple line. Trabicular processes between the septa very pen seen 
from above. Differs from S. radians in having larger cells, which appear more open; 3 
thinner septa, “ consequently wider intervening spaces, and four complete cycles — 
















of septa. — A. 
t Acanthastrea cca mapa A large species, fi siete Rik 
a setts in diameter; mar; f base s unded by a strong epitheca; cells large, vary 
g from .3 to .7 of an Sasi in their wiicyn diameter, but mostly about 5 inch, irregu-— 
iots wand gonal, often much elongated, and then having two or more centres, mode- 
rately deep (.15 inch), centre depressed, columella but little developed. Septa thin, in 
fine cycles, the last usually incomplete, aparea subequally, the upper part divided — 
ree #0 f five long , Sharp | teeth, below which the teeth are smaller and i 
slender. W ingle, often double with vesicles between. — 

ABV: 
t Mussa Harttii Verrill. tiful fi } 
: branches, and simple, ciieuane cells. Branches wr fer dividing, es 5 to o of 
an inch in diameter, the living part extending from .2 to .5 of an inch from the sum” 



ate, and often surrounded by an imperfect epitheca, cove ea oe a trong, subequal 
Goste, y with numeroTis wiy; nearly equal, recurved spines. rete ne from .5 to 1.2 inches 
ind rather deep (.4 to 5 inch). 
marae five cycl t, where they project about .1 of an inch, 
the upper part aries pia from four to seven unequal, sharp, diverging teeth, with 
