A. E. Verrill — Comparisons of Coral Faunas. 189 



Favia leptophylla Ver. See p. 91, and these Trans., i, p. 353. 



Plate xiii, figures 4, 5. 



Abrolhos Reefs, type, (C. F. Hartt). 



Family Orbicellidae. See p. 93. Vaughan, p. 300. 



Orbicella aperta Ver. See p. 103, and these Trans., i, p. 356. 



Plate xxxiii, figures 1, la. 



Abrolhos Reefs, type, (C. F. Hartt) ; Itaparica, Bay of Bahia 

 (C. F. Hartt, R. Rathbun). 



Orbicella Braziliana Ver. See p. 101. 



Off Barra Grande, in 30 fathoms, Challenger Exped. (Qnelch). 



Orbicella cavernosa, var. hirta Ver. See p. 103. 



Plate xxxiii, figure 2, 2a. 



This form, briefly described on p. 103, deserves further notice. 

 Although it resembles O. cavernosa in appearance, it differs so 

 much in details that it may hereafter be separated as a distinct 

 species, when a series of specimens can be carefully compared. I 

 have, unfortunately, only seen one specimen. This is an incrusting 

 plate, 130 mm broad and 30 to 40 mm thick. 



The mature corallites are pretty uniform in size, rather exsert, 

 near together, nearly round, roughened by the slightly exsert, 

 unequal, rudely serrulate, rounded tops of the septa, and strongty 

 costate on the nearly vertical sides. The costa? are rather elevated, 

 unequal in height, but nearly equal in thickness, not much thickened 

 above, interlocking ; their edges are roughly and lacerately serrulate, 

 or hispid, the teeth being divided into small points ; their sides are 

 also roughly hispid with sharp granules, leaving narrow intercostal 

 spaces. The calicles are wide and deep. The septa are about 40 to 

 48 in the larger calicles, those of the last cycle being quite narrow, 

 but nearly as high as the others distally, and toothed in the same 

 way. The 24 larger septa are subequal, rather narrow, rounded 

 distally, their inner edge concave or perpendicular, so that the calicle 

 is broad below, and often slight constricted above by the overarch- 

 ing of the upper part of the septa. The entire edge of the septa is 

 roughly serrulate, but more so on the distal portion, and their sur- 

 faces are roughly granulated. At the base there is a rough, spine- 

 like paliform tooth, directed inward to the columella, and often 



