70 ISOPHYLLIA. 



LITHOPHYLLIA M.-Edw. & H. 



Under this name the young of several other genera have probably 

 been described, such as Mussa, Isophyllia, Symphyllia, etc. The ques- 

 tion can only be decided by series of specimens in different states of 

 development, I leave the following species under that genus for want 

 of that test, but should hesitate much before giving them a definite 

 place in the system. 



Lithophyllia cubensis M.-Edw. & II. 



L. argenome ? Duch. & Mich. 

 L. cylindrical Duch. & Mich. 



Two specimens obtained at Tortugas show no appearance of division 

 into lobes, though 3 to 3.5 cm. in diameter; another smaller specimen 

 comes from Bermuda. The septa and their spines are covered laterally 

 with small spiniform tubercles, which give them a hirsute appearance. 

 The spines of the younger septa are irregular, branching, sometimes 

 coalescing and perforated. My specimens were found growing on dead 

 branches of Madrepora cervicornis. 



Lithophyllia dubia Duch. & Mich. 



A fine specimen of this supposed species agrees with the figures of 

 Duchassaing and Michelotti. I suspect it to be the young form of an 

 Isophyllia or Mussa (perhaps Mussa carduus). My specimen shows a 

 beginning of division into lobes. It was obtained on the reef at Looe 

 Kev. 



ISOPHYLLIA M.-Edw. & H. 

 Isophyllia multilamella Poubt. 



Lithophyllia multilamella Duch. & Mich, (young specimen). 



The differences between Isophyllia and Symphyllia are so slight as 

 to lead to continual confusion. I prefer to merge them under the above 

 name. 



The septa in this species are very closely set, there being from 13 to 



