364 Verrill^ Notes on Radiata. 



This agrees pretty closely with a specimen from Florida (Maj. E. 

 B. Hunt), in which, however, some of the branches do not have 

 sunken cells. 



Millepora alcicornis Linn., var., digitata (?) Esper 



Several specimens, differing widely from all the preceding, approach 

 so nearly some of the varieties of 31. alcicornis as to render their 

 identity highly probable. They do not, however, agree precisely 

 with any West Indian specimens in my possession. The most impor- 

 tant differences are the somewhat more porous texture and the greater 

 regularity and more scattered arrangement of the cells. The branches 

 are round and digitate, the branchlets with three to five, short, com- 

 pressed divisions at the ends. 



This variety forms large clusters of flat branches, erect or horizontal, fringing the 

 submerged edges of the reefs, and sometimes two or three feet across. It is light yel- 

 lowish brown or pinkish in color. Abundant at Cape Frio, Abrolhos, Porto Seguro, 

 Bahia, Maceio, and intermediate localities. — c. f. h. 



Millepora alcicornis Linn., var. fenestrata Duch. and Mich. 



With the preceding are a few specimens, agreeing in all respects, 

 except that the branches are in a single plane and coalesce so as to 

 leave numerous openings. The terminal branchlets are longer and 

 more slender. 



Abrolhos Reefs,— C. F. Hartt. 



Remarks on the Brazilian Coral-fauna., hy C. F. Hartt. 



The following general conclusions may be added with reference to 

 the coral-fauna of Brazil. 



1st. The species are, as Prof Verrill above remarks, almost without 

 exception, peculiar to the Brazilian coast, along which they have quite 

 a wide distribution ; the most of the species ranging from Cape St. 

 Roque to Cape Frio, which seems to be the southern limit of the fauna. 

 In the Bay of Rio de Janeiro, where the conditions appear to be very 

 favorable for coral growth, I have been able to find only one or two 

 species of madreporarian corals, and these were Astrangim. 



2d. The Brazilian fauna bears a close resemblance to the West In- 

 dian, and there are many representative species. Thus the Siderastrma 

 stellata, Heliastrcea aperta, Favia gravida, and Porites solida are rep- 

 resentatives of West Indian forms ; and among the Halcyonoids, Hy- 

 menogorgia represents the Mhipidogorgice of the West Indian fauna. 



