194 A. JEJ. Veirill — Gompariso7is of Coral Famice. 



toothed ; lateral surfaces sharpl}^ and finely spinulose. The teeth are 

 often of nearl}' uniform size and length on the whole edge, but more 

 frequently the upper ones are wider and thicker, while the lower 

 ones are slender, sharp, mostl}^ branched, thorny or lacerate, but often 

 acute and simple. Very thin and narrow sej)ta often alternate with 

 the wider ones. Columella well developed, trabecular and roughly 

 spinulose. 



The larger specimen is about 112"'" broad and 45'"™ thick. 



Pernambijco, 1870, two types (C. F. Hartt), Nos. 4542 and 4543. 



This species might be placed in the subgenus Isophyllia about as 

 well as in 8ymphyllia, for in the smaller specimen the distal teeth 

 are generally not larger than the proximal. But in the larger ex- 

 ample the reverse is true, so that it is another intermediate form. 



It is nearly allied to M. hispida V, (see p. 12*7), but has more 

 numerous and thinner septa. A larger series may eventually show 

 that they are varieties of a single species. 



Family Astrangidae Ver. These Trans., i, p. 524, 1867. 

 Astrangia, sp. 



Mr. R. Rathbun (op. cit., 1877, p. 542) mentioned the occurrence 

 of an Astrangia on the Brazilian reefs, but I have not seen the 

 specimens referred to. He stated that the corallites are widely 

 separated, but "united by thin, creeping stolons." 



According to Vaughan (Porto Rican Corals, p. 299), there are 

 three species of Astragidce on the Brazilian coast : An Astrangia 

 similar to ^1. solitaria (Les.) Ver., 1864; a new species, A. Eathhuni 

 Vaughan, MSS. ; and Phyllangia Americana Edw. and Haime. 



Family Agaricidse Ver. See p. 139. 

 Agaricia agaricites (Linne) E. & Haime. See pp. 146, 149. 



Plate xxvi, fig. 3 ; pl. xxvii, pigs. 2, 2a, 7, 7a (typical form). 



Var. humilis Ver., nov. 



Agaricia agaricites? Verrill, these Trans., i, p. 852, 1867. 



Coral small, encrusting, but often with a narrow, very thin, trans- 

 lucent free edge, which is delicately striate-costulate externally, the 

 costulte being alternately larger and smaller and minutely gran- 

 ulated. 



Calicles small, deep, crowded, mostly in short, irregular, concen- 

 tric or sinuous series of 3 to 12, in narrow, deep valleys, separated by 

 narrow, acute collines, which often anastomose. In the young speci- 



