102 THE BERMUDA ISLANDS. 



Bermudas, but I have failed to detect any specimens among 

 our collections which can be confidently referred to these 

 species. On the other hand, I find one or two forms which I 

 have not yet been able to identify with any described forms. 



Siderastraea galaxea, Ellis and Solander. 



Abundant on the shoals of Gallows Island, near the mouth 

 of Flatts Inlet, where the colonies come to within about two 

 inches of the surface ; also on the borders of Harrington Sound. 



Porites clavaria, Lamk. 



Two specimens, dredged in Harrington Sound. 



Porites astraeoides, Lamk. 



We found this species very abundantly along the outer reef, 

 especially on the flats of the North Rock, where it is the domi- 

 nant form of coral. The species appears to have been over- 

 looked by the Challenger party, and indeed, the only reference 

 that I have been able to find indicating the occurrence of this 

 common West Indian form among the Bermudas is contained 

 in Mr. Rathbun's list of the species of Porites in the United 

 States National Museum (Proc. U. S. National Museum, 1887, 

 p. 354). 



Maeandrina labyrinthica, Ellis and Solander. 



Three specimens, from the North Rock. 



Maeandrina strigosa, Dana. 



This form is represented by large, sub-globose specimens, 

 one of which, obtained through purchase, and probably from 

 Castle Harbor, has an exceedingly attenuated base of attach- 

 ment. The corallum is thus openly turbinate, or even pedicu- 

 late, and exhibits in its regular scalariform outline the succes- 

 sive stages of outward development. 



Diploria cerebriformis, Lamk. 



This species is exceedingly abundant in the shoals lying to 

 the leeward of the marginal reef, where its huge hemispheri- 

 cal or reniform masses of bright orange, measuring as much 

 as four or five feet in diameter, can be distinctly seen through 



