362 Prof. P. M. Duncan on Prof. G. Lindstrim’s 
revision of the genera of corals, it was necessary for me to 
reconsider the essay on the actinology of the Atlantic. 
Much has been written upon the deep-sea corals since Prof. 
Lindstrém’s essay was read. Thus my paper on the Madre- 
poraria dredged up by H.M.S. ‘ Porcupine’ was read May 
1876 and published in 1878 (Trans. Zool. Soe. vol. x. part 5, 
1878). 
Prof. H. N. Moseley’s preliminary report on the ‘ Challenger’ 
corals (1875) was followed in 1879 by the reception of his 
full report on the ‘Challenger’ corals. This book was pub- 
lished subsequently. 
The late M. de Pourtalés published the Report on the 
Corals and Antipatharia of the ‘ Blake’ Expedition in 1880. 
These researches might have modified Prof. Lindstrém’s 
views ; but as they do not appear to have done so, it is neces- 
sary that I should criticize them seriatim, taking the oppor- 
tunity, however, to point out the valuable parts of the Pro- 
fessor’s communication. 
1. Lindstrém makes the interesting discovery of the 
presence of the variety borealis, nobis, of Caryophyllia clavus, 
Scacchi, as far south as lat. 48° 19’, in 109 fathoms. Hitherto 
it had only been known as a North-Atlantic and Mediterra- 
nean form. He gave the first locality beyond its supposed 
home for this variety, which now has been found by Moseley 
in the Patagonian area. 
2. I described Caryophyllia Pourtalesi, dredged from deep 
water in the North Atlantic *. Professor Lindstrém says :— 
“This coral cannot properly be classified with the genus 
Caryophyllia, as there are no regular paluli, and all such are 
entirely wanting in the North-Atlantic specimen (7. e. Lind- 
strém’s). But my material is too scanty to decide the 
question.” He places Paracyathus thulensis, Gosse, as a 
synonym. 
My material was not scanty, and the species was minutely 
described and the small columella and the irregular pali were 
noticed. In an essay on the ‘ Porcupine’ Madreporaria 
(part 2), which I read before the Zoological Society a few 
months after Prof. Lindstrém read his, I gave abundant 
evidence of the existence of pali in the species; and Erxle- 
ben’s drawings clearly indicate them}. ‘The number of pali 
is small, and they are especially visible when the columella is 
* “ Madreporaria dredged during the Expeditions of H.M.S. ‘ Porcu- 
pine,” Trans. Zool. Soc. vol. viii. pt. 5, p. 317, pl. xli. figs. 3-10. 
+ Trans. Zool. Soc. vol, x. pt. 5, p. 238, ae xhii. figs. 1-7. Read May 
1876, published 1878. Jllustr. Cat. Mus. Comp. Zool. Harvard.—No. IV, 
“ Deep-sea Corals,” 1871, p. 12, pl. ii. figs. 1, 2, 3. 
oo 
