72 bulletin: museum of comparative zoology. 



more elevated, but the septa, although distinct aud arranged as on the 

 sides, do not have the various trabecular elements so clearly differen- 

 tiated, the latter, however, are the same in number and arrangement on 

 both sides and top. 



Locality: — Easter Island. 



Remarks: — This species belongs in division " B " of Bernard's " Analysis 

 and distribution of types of calicles," " Forms in which one ring of extra, 

 intervening, or costal trabeculae appears typically in the walls." 



There are four forms in Bernard's Catalogue of Porites to which the one 

 under consideration is closely related, they are : 



1. P. Fiji Islands (24) 4, p. 46. 



2. P. EUice Islands (17) 8, p. 70. 



3. P. Ellice Islands (17) 9, p. 72. 



4. P. Ellice Islands (17) 10, p. 73. 



The calices of the last three are somewhat smaller than in the Easter Island 

 form ; the resemblance to the first is extremely close, but its skeleton seems 

 denser. As none of the forms with which comparison is made have been 

 named specifically, the validity of P. paschalensis is not affected should it 

 prove identical with one of them. 



