796 
THE VOYAGE OF H.M.S. CHALLENGER. 
systems has been dredged by the U.S.S. ‘ Blake.’ Flabelhim apertum (fig. 285) is 
interesting because it was dredged at two very distant localities, viz., off Portugal in 
900 fathoms, and off Prince Edward Island in 310 fathoms. 
Fin. C l$:>.—F!abcllmn apertum, Moseley ; natural size. Off Prince Edward Island, 310 fathoms. 
“ The most abundant of the very few compound Madreporarian corals which inhabit 
deep waters is Lopholielia prolifera (fig. 286). It varies very much in form and mode of 
growth, and sometimes forms bushes of considerable size. It occurs in the Mediterranean 
with Precious Coral (Corallmm rubrum), off the English and Norwegian coasts in 100 
fathoms or so, and all over the Atlantic, off Tristan da Cunha in the south, off 
Fin. ‘ISft.—Lnphoheb'a prolifera, M.-Edw. and Haime ; three-fourths the natural size. 
