POLYPS AND CORALS. 75 



ADDITIONS AND CORRECTIONS. 



Since printing the earlier parts ot this Synopsis sev- 

 eral changes in the genera have become necessary, while 

 some additional specimens have been found, belonging to 

 the collection, which were previously overlooked. In 

 order to illustrate more fully the coral faunae of some of 

 the localities visited, I have also added a few species not 

 collected by the Expedition, which are new or little 

 known. These are all in the Museum of Yale CoUeo-e. 



ALCYONARIA. 



GrORGONID^. 



LiTiGOCiA cuspiDATA VcrriU, Trans. Conn. Acad., I, 

 p. 403, = Leptogorgia cuspidata V. (Vol. IV. p. 186). 



GoRGONiA ALBICANS Kollikcr. — The peculiar specimen 

 mentioned under Lopliogorgia palma E. and H. (p. 187) 

 proves to belong to this species. 



Plexaurid^. 

 EuPLEXAURA Verrill, gen. nov. 



The species referred doubtfully to Plexaura friabilis 

 Lamx. , has spicula that differ widely from those of Plex- 

 aura, and although they approach those of Plexaurella 

 more nearly, they differ so much as to render it impossi- 

 ble to refer the species to that genus without modifying 

 its character considerably. Therefore I propose to con- 

 sider it the type of a new genus. 



In external characters it resembles Plexaurella, with 

 rather large, open cells. The spicula are mostly short, 

 stout, blunt, warty spindles, of rather small size, with a 



