ISOPHYLLIA. 71 



15 in a centimeter. The ridges are sometimes slightly flattened on top 

 and marked generally with a narrow l)ut distinct furrow. Columella 

 well developed, papillose. 



Though not sure of the identification, as indeed will be mostly the 

 case in any attempt to identify the numerous species of Symphyllia too 

 imperfectly characterized by Duchassaing and Michelotti, I prefer not 

 to introduce a new name, as there are, no doubt, many superfluous ones 

 in the number. 



The Museum of Comparative Zoology has a specimen from Florida 

 and one from Bermuda. 



Isophyllia dipsacea Ac. Ms. 



Si/mpJii/llia ? ilipfacea Edw & H. 



3/u.s-.s(( ili/isacca Dana. 



Non Sym/ihi/llia (jiiadulpensis Edw. & H. 



Rather common, quite a numljer of fine specimens in the Museum of 

 Com25arative Zoology. 



Isophyllia guadulpensis Polrt. 



Symphyllia guadulpensis M.-Edw. & 11. 

 Isophyllia rigida Verrill. 

 Non Aslirea rigida Dana. 



The specimens labelled by Mr. Veri-ill all agree in having lamellar 

 costa3 when young, much more marked than in any other sj^ecies. The 

 other characters are rather vague. 



The diagram of the calicles of Astrcm rigida given by Dana showing a 

 hexagonal limitation of the calicles, so different from the irregular, 

 partly meandriform shape of those of the sj^ecies in question, seems to 

 preclude the identification as made by Verrill. The imperfect descrip- 

 tion seems to call for a new one. Corallum flat-hemispherical ; epitheca 

 rudimentary or none ; costae sublammellar, particularly in the young, 

 spiuulous ; calicles rarely simple, mostly in sinuous series with two or 

 three centres. Ridges rounded, Avith very small furrow on top. Septa 

 closely set, rather equal, 10 to 12 to a centimeter, sparsely granular 

 on their faces, with rather strong triangular teeth ; columella papillose. 



The young divide quite regularly into six lobes, corresponding to 

 the systems, the primary septa enlarging and forming the partitions 

 between the lobes. 



