Verrill, Notes on Radiata. 355 



This species is allied to F. ananas and F. fragum, but has stouter 

 and more spiny costa3 and narrower and sharper septa than either. 

 From F.fragum Edw. and Haime {Favia ananas Pallas, Dana and 

 most authors), which is the most common West Indian form, it differs 

 also in having more prominent and larger cells, thicker and rougher 

 septa, which project more and are not rounded at the summits, and 

 both the septa and costfe more coarsely dentate. 



Common in tide-pools of the reefs and rocky shores from Cape Frio to Pernambuco, 

 with Siderastraa stellata, which see. — c. F. H. 



Favia conferta Yerriu, sp. nov. 



Corallum compact, forming broad convex or hemispherical masses, 

 two to four inches in diameter, and one or two thick, covered beneath 

 by a strongly wrinkled epitheca. Cells crowded, deep, unequal and 

 irregular, mostly elongated, often sinuous and somewhat mseandrini- 

 form, with three or four centers, sometimes nearly circular, not pro- 

 jecting, the walls united to their summits, showing only a slight sulca- 

 tion between the adjacent cells, which are, therefore, separated only 

 by a narrow ridge, which at times becomes simple, as in Goniastrcea. 

 Septa crowded, in the circular cells in four cycles, the last usually 

 incomplete (36 to 48), all except those of the last cycle subequal, 

 narrow within, obtusely rounded or truncate at the summits, which 

 project somewhat and are regularly serrate, inner edge perpendicular. 

 Pali in front of the principal septa, little developed, roughly serrate. 

 Columella well developed, with a roughly spinose, uneven surface. 

 In a transverse section the walls between the cells are compact, united 

 into a narrow, nearly solid ridge, showing only a few very small, 

 scattered vesicles. Breadth of the cells "12 to •15 ; length "2 to "8 of 

 an inch. 



Abrolhos Reefs, Brazil, — C. F. Hartt. 



This interesting species is, in many respects, intermediate between 

 Favia and 3fwandrina, and has relations with Goniastrcea, yet its 

 proper place appears to be in the genus Favia. It is somewhat allied 

 to F. deformata Edw. and Haime. It also resembles, in general form, 

 F. incerta Duch. and Mich. (?^ Goniastrcea varia Verrill), but appears 

 quite distinct in the form of the septa and intervening ridges, as well 

 as in the remarkably elongated and narrow cells. 



Common in tide-pools from Cape Frio to Pernambuco. — c. f. h. 



Acanthastrsea Braziliensis Verrill, sp. nov. 



Corallum large, hemispherical or subglobular, regular. Base sur- 

 rounded at the margin by a strong epitheca. Cells large, usually '3 



