192 A. E. Verritt — Comparisons of Coral Faunae. 



minutely and sharply serrulate, each denticle forming the end of a 

 curved series of sharp granules on each side. These gradually fade 

 out proximally. 



The columella is formed by a continuous, median, lamelliform 

 ])late, and by thin, interrupted lamellae on each side of it, formed by 

 foliate extensions of the lower inner edge of the septa, which bend 

 to one side and unite together more or less, and also join the central 

 lamella at irregular intervals. 



The exterior wall is covered with rows of small, rough, or lacerate, 

 conical spinules that stand on slightly raised costre. There is no 

 epitheca. The exterior was covered with living tissue to the basal 

 edge of the pedicel. The larger specimen, figured on plate xxxiv, 

 tig. ], was from Itaparica I., Bay of Bahia. No. 4543. 



Abrolhos Reefs and Victoria (Hartt); Itaparica I., Bahia(Rathbun). 



Family Mussidse Ver. ,See p. 115. 

 Mussa Harttii Ver. See p. 128, and these Trans., i, pp. 357, 358, 1867. 



Plates xxii, xxiii, xxv, xxxiii. 



Var. laxa, Ver. See p. 128. 



Plate xxiii, figure 2. 



Abrolhos Reefs, type, Victoria, Porto Seguro, and Pernambuco 

 (Hartt) ; Bahia (R. Rathbun). Mostly in 3-6 feet of water (Hartt). 



Var. conferta Ver. See p. 129. 



Plate xxiii, fig. 1 ; pl. xxv, fig. 3 ; pl. xxxiii, fig. 3. 



Abrolhos Reefs, type, (C. F. Hartt) ; Pernambuco, Victoria, 

 Porto Seguro, Mar Grande, and Periperi, Bahia (C. F. Hartt, 

 R. Rathbun). 



Var. intermedia Ver. See p. 128. 



Plate xxii, figure 2. 

 Pernambuco (Rathbun). 



Var. confertifolia Ver. See p. 129. 



Plate xxii, figure 1. 

 Pernambuco, type, (Derby and Wilmot), No. 4551. 



Mussa (Symphyllia) Braziliensis Ver. 



Acanthastrcea Braziliensis Verrill, these Trans., i, p. 355, 1867. 

 Plate xxi, fig. 1 ; pl. xxxiii, fig. 4. 



