Corals dredged by H.M.S. ' Challenger.' 



565 



Hence it will be seen that great additions to our knowledge concerning 

 the bathyinetrical range of corals has been made by the ' Challenger ' 

 Expedition. The following statements combine the results at present 

 attained : — 



Only one coral, Fungia symmetrica, has as yet been obtained from a 

 greater depth than 1600 fathoms. It extends its range from 30 to 2900 

 fathoms. 



Only three corals, Caryophyllia formosa, Flabellum apertum (c. f.), and 

 Cryptohelia pudica (c.f.), have, besides Fungia symmetrica, been obtained 

 at as great a depth as 1500 fathoms. 



From a depth of 1000 fathoms species of the genera Caryophyllia, 

 Bathycyathus, Deitocyathus, Ceratotrochus, Desmophyllum, Amphihelia, and 

 Solenosmilia have, in addition, been dredged. 



Table showing the genera of Corals ivhich have been obtained from a depth 

 of 250 fathoms and upwards by : — A, the American Coast Survey ; 

 B, H.M.S. ' Porcupine ; C, H.M.S. ' Challenger ; with their Bathy- 

 inetrical Distribution. 



Depth in fms. ... 



250. 



500. 



750. 1000. 



1250. 



1500. 



1750. 



2000. 



2250. 



2500. 



2750. 



3000. Age. 



Caryophyllia 



ABC 



C 



AC 



A 



AC 



C 



B 

 BC 



ABC 

 B 

 A 

 C 



C 



ABC 



AC 



A 



A 



A 

 BC 



A 



A 

 AC 



A 

 AC 



BC 



B 

 C 



BC 



B 

 B 



B 



C 



AC 



A 



B 



C 



B 



B 



BC 



C 



C 



BC 



BC 



B 



C 

 C 



B 

 C 



C 

 A 

 B 



O 



C 



o 

 o 



C 



c 

 c 



c 





C 





C 



... IS-T. 



Acanthoeyathus, c. f. 



Trochocyathus 



Bathycyathus 



Thecocy athus 





T. 



S.T. 



T. 



S. 

 T. 

 T. 



T. 

 T. 



T. 

 S. T. 



T. 

 T. 



Deitocyathus 



Ceratotrochus 



Sabinotrochus 



Desmophyllum 



Flabellum 



Cyathohelia 



Lophohelia 



Amphihelia 1 , ? >. 

 *Diplohelia J { ' } 

 Madracis 



Solenosmilia 



Cladocora 





Cryptohelia 



Distichopora 





Balanopbyllia 



Thecopsammia 



Dendrophyllia 



Haplophyllia 



Pliobothrius 





' Noma,' off the Coast of Spain and Portugal," by W. Saville Kent, Ann. & Mag. Nat. 

 Hist. 1870, vol. vi. p. 459. 



* Diplohelia profunda (Pouvt.) is believed to be identical with Amphihelia ramea by 

 Prof. M. Duncan. 



