[ 235 ] 



VI. A Description of the Madreporaria dredged up during the ETpedition of H. M.S. 

 '■Forcupine' in 1869 and 1870. — Part II. By Professor P. Martin Duncan, M.B. 

 (Lond.), F.B.S., President of the Geological Society. 



Received May 10th, 1876. Read May 16th, 1876. 



[Plates XLIII.-XLV.] 



Contents. 



I. Introduction page 235 III. Descriptions of New Species, and Ifotes on 



II. List of New Species, and Tahle of their described Species page 237 



Classification 236 IV. General Remarks 245 



I. Introduction. 



1 HE first part of this description of the corals dredged up hy H.M.S. ' Porcupine,' 

 under the direction of Dr. Carpenter, C.B., F.K.S., and Professor Wyville Thomson, 

 F.R.S., was read on May 16th, 1871, and has been already published in the Trans- 

 actions of the Society (vol. viii. pt. v.). A certain number of specimens remained 

 undescribed on account of their admixture with other matters dredged up, and 

 partly on account of their difficulty of determination. It was intended that not 

 much attention should be paid to them until after more specimens of deep-sea 

 corals should have been received, as it was manifestly desirable that one course of 

 study should complete this by no means easy description and analysis of the corals of 

 the deep sea. During the voyage of the ' Challenger' a considerable number of species 

 of deep-sea forms of Madreporaria have been collected ; but as it appears, from a com- 

 munication to the Eoyal Society by Mr. Moseley, one of the staff of the ' Challenger,' 

 that the species dredged up will be described by him, I think it best now to offer this 

 concluding essay to this Society. The interesting and most valuable communication on 

 the deep-sea corals dredged up by the ' Hassler Expedition,' written by Alexander 

 Agassiz and L. F. de Pourtales, has been published since the first part of this essay 

 appeared ; and whilst my former communication was in the press I had the advantage 

 of receiving Count Pourtales's descriptions of the deep-sea corals collected in the Gulf- 

 stream Expeditions in 1867-1869. Both of these works have been of the greatest use 

 to me. I include also some notes on some of the species already described. 



VOL. X.— part v. No. 1.— March 1st, 1878. 2 l 



