VI. A Description of the Madreporaria dredged up during the Expedition of H.M.S. 
‘ Porcupine’ in 1869 and 1870.—Part II. By Professor P. Martin Duncan, J.B. 
(Lond.), F.R.S., President of the Geological Society. 
Received May 10th, 1876. Read May 16th, 1876. 
[Puates XLITI.-XLV.} 
ContEnts. 
J. Introduction. . . . . . . «. page 235 III. Descriptions of New Species, and Notes on 
II. List of New Species, and Table of their described Species. . . . . . page 237 
Olasaricniton see a ea eee) LV. .Generall'Remarks! 3 2-91), <0 = of oko 
I, IytRoDUCTION. 
THE first part of this description of the corals dredged up by H.MLS. ‘ Porcupine,’ 
under the direction of Dr. Carpenter, C.B., F.R.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 Royal 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 
tome. I include also some notes on some of the species already described. 
voL. x.—PART Vv. No. 1.—Warch 1st, 1878. 21 
