40 THE VOYAGE OF H.M.S. CHALLENGER. 



Micropora coreacea, Esper, Lepralia pertusa, Esper, Schizoporella auriculata, Hassall, 

 Cellepora costazii, Audouin, EntcAlophora clavata, Busk. 



Escharoides verruculata, Busk.' I do not think this is the Chorizop>ora verruculata 

 of Sraitt, but believe that it is the Rliynchopora profunda, MacOillivray, but 

 there was not material for further study. It has a large internal denticle placed 

 diagonally. 



Cribrilina monoceros, Busk, add Station 320, 600 fathoms. 



Frondipora verrucosa, Lamouroux. 



Madrepore rammx, ifec, Marsigli, Hist. Phys. de la Mer., p. 150, pi. xxxiv. figs. 165, 166. 

 KrustensUiTM verrucosa, Lamouroux, Expos. Meth., p. 41, pi. Ixxiv. figs. 10-13 (juv.), pi. 



xxvi. fig. 5. 

 Frondipora reticulata, Blainv., Man. d'Actiu., p. 406, pi. Ixix. fig. 1 ; Siuitt, Ofversigt. k. 



Vetensk. Akad. Fcirhandl., vol. xxiii. 1866, p. 407, var. a and /3 ; Bu.«k, Mar. Polyz., part 



iii. p. 38, pi. xxi. ; A. Milne-Edwards, Arch, des Missions Scient. et Litt., ser. 3""% vol. 



ix. p. 22. 

 Frondipora verrucosa. Busk, loc. cit., p. 39 ; Waters, Ann. and Jlag. Nat. Hist., ser. 5, vol. iii. 



p. 279, pi. xxiv. figs. 1-7. 

 Frondipora marsillii, Mich., Icon. Zooph., p. 68, pi. xiv. fig. 4 ; Pergens, Plioc. Bry. von Rhodes. 



Ann. Nat. Hist. Hof museums, vol. ii. p. 11, pi. i. fig. 3, 4. 



Specimens in Edinburgh from Station 135c, marked Fascicidipora ramosa, are most 

 undoubted Frondipora, spreading out for some inches with nearly round branches, 

 frequently dichotomising, and often anastomosing, but also sometimes throwing out thin 

 connecting bars from neio-hbourincr branches. 



From the specimens examined in the Mediterranean, I still adhere to my opinion that 

 Frondipora reticulata and Frondipora verrucosa are undoubtedly the same, but as 

 pointed out and shown in my figures {loc. cit., fig.s. 4-6), the young colonies are in 

 some stages much like the Fascicidip>ora ramosa of Busk. Although from Nightingale 

 Island and marked Frondipora ramosa, I should presume these specimens have not 

 been critically examined, and that the description has slipped in from some others. 



Habitat. — Station 135c, off Nightingale Island, 110 fathoms; Mediterranean. Fossil 

 —Pliocene of Sicily (A. W. coll.) ; Rhodes (P.). 



Idmonea bifrons. Waters. 



Idmouea bifrons, Waters, Quart. Journ. Geol. Soc, vol. si. p. 685, pi. xxx. figs. 10, 11. 



The zoarium is nearly cylindrical, but slightly compressed laterally, about To mm. 

 in diameter, with 6 to 10 zocecia on each side of an anterior and dorsal median line ; 



' Zool. CImU. Exp , part xxx. p. 150. 



