A.F. Verrill — Comparisons of Coral Faunas. 197 



The septa are narrow, equal, and all join the wide columella, so as 

 to leave a rather regular circle of small, deep, interseptal loculi or 

 pits. The columella is unusually wide, nearly flat, generally with- 

 out either a central pit or umbo. 



Diameter of the calicles mostly 1.5 to 2 mm . 



Maria Farinha, Pernambuco (Hartt, 1870). No. 4540. 



This coral is much more porous than P. Verrillii ; the calicles are 

 less conspicuously stellate ; the division walls are much narrower 

 and more porous ; the columella is larger, and not umbonate, as in 

 that species. 



HYDROZOA. 

 H Y35ROCOR ALLI A , 



Family Millepcridae Flem., pars, 1828. Edw. & Haime (pars). 



Millepora nitida Ver. PI. xxxvi D, fig. 1. 



These Trans., i, p. 362, 1867. 



Abrolhos Reefs and Porto Seguro, low-tide to 4 feet deep (C. F. 

 Hartt). 



Millepora Braziliensis Ver. PI. xxxvi D, fig. 2. 

 These Trans., i, p. 363, 1867. 

 Pernambuco and Abrolhos (C. F. Hartt, R. Rathbun). 



Millepora alcicornis (L.), var. cellulosa Ver. 



These Trans., i, p. 363, 1867. 



Pernambuco (C. F. Hartt), type ; Rio Formosa ; Parahyba do 

 Norte. 



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

 Verrill, these Trans., i, p. 364, 1867. 



Abrolhos, Cape Frio, Porto Seguro, Bahia, and Maceio (C. F. 



Hartt). 



Millepora alcicornis (L.), var. fenestrata D. & Mich. 

 Verrill, these Trans., i, p. 364, 1867. 



Abrolhos Reefs (C. F. Hartt). 



I have not revised the several forms of Millepora recorded by me 

 in 1867, though collections since received might cause some changes 

 or additions, if carefully studied. 



