REPORT ON THE ALCYONARIA. 31 



The following genera have, up to the present time, been observed in this deeper 

 zone : — Sympodium, Clavularia, Anthomastus, Barathrobius, Pleurocor allium, Stropho- 

 gorgia, Ceratoisis, Acanella, Dasygorgia, Callozostron, Stenella, Scirpearella. 



In the fifth zone, between 2000 and 3000 fathoms, at a depth of 2300 fathoms, 

 there was obtained but a single distinct species belonging to the Isidse, — Bathygorgia 

 2)rofunda. This species shows the above-mentioned character of the deep-sea Alcyonaria 

 to the fullest extent. A simple, probably creeping, stem bears the polyps in a single row ; 

 these stand erect, and have their walls strengthened by the rigid spicules. 



