62 BATIIYMETRICAL DISTRIBUTION. 



Tliccocyathus I:i3vigatu8. 

 Lophohelia prolifera. 

 St3"laster erubosoens. 

 Allopora ininiata. 

 Distk'lio[)ora foliacea. 

 Thecopsauimia tintinnabulum. 

 Thecopsaiumia socialis. 

 Deiulroplij^llia cornucopia. 

 Dendroplijilia cvatlioidcs. 

 Diascris pusilla. 

 Diaseris crispa. 

 Pliobothrus syininotricus. 

 Pliobothvus tiilnilatus. 

 Ill tbo CilolMgerina mud we find only the following species : — 

 Cary()])Ii\dlia cornuformis (living). 

 Paraeyatlius follieulus (dead). 

 Diplolielia profunda (dead). 

 Fungia symmetrica (dead). 

 Haplophyllia paradoxa (living). 

 On the whole the dift'erences between these dilferent regions are not 

 very great, at least as far as tamil}- and generic cliaracters go. But the 

 diiferences i'voin tlie nearest reef I'a una are, as might ))e expected, very 

 striking. No Astneichv, no Madreporidu' (excUidiiig the Kupsaui- 

 inidu'). the nio^t abundant families in species and in iudixiduals on the 

 West Indian reefs, extend to any considerable de]ith. Tiie families hav- 

 ing apparently the greatest range in depth are the Oculinida'. the 

 Stylasteridie, and the Milleporida\ 



Simple corals which ibrni such a large pro|)ortion of the (leei)-sea 

 fauna are not i-eiireseiited iit all in the Fioriibau leef fauna ; some 

 species are (h'scrihed from tlie ^Vest Indies, hut without indications of 

 dt-pth. 



The specimens oi' soundings brought up by the h'ad from the (iulf 

 Stream fnther uortii contain frecpiently small fragments of corals, of 

 which tlic following ha\'e been <letermined : — 



Ciyptohelia iVircei, lat. 3F 32' N., long. 78" 20' W., GOO fathoms. 

 Disticiiopora foliacea, lat. oT 32' N., long. 78' 20' W., (300 fathoms. 

 Stylaster ernbescens, lat. 31' 32' N.. long. 78' 20' W., 600 fithoms. 

 Lepidopora glabra, lat. 31^ 32' N., long. 78° 20' W., fiOO fathoms. 

 Diplolielia profunda, lat. 30"' U' N., long. 79° 35V W., 530 fothoms. 

 Caryophyllia formosa, lat. 30' H' N., long. 70° 35}' 530 fathoms. 

 Styiaster ernbescens, lat. 20° 48"' N., long. 79° 17' W., 450 fathoms. 

 J.epidoi)()ra glabra, lat. 29° 48' N., long. 79° 17' W., 450 fathoms. 

 Diplolielia profunda, lat. 28° 53^' N., long. 79° 33f' W., 410 fathoms. 

 These localities are all in or near tlie axis of the dull" Stream, lie- 



