446 Mr. P. W. Bassett-Smith on 



position, sometimes in close contact, projecting slightly, 

 circular or compressed, from 2 to 3 millim. wide ; septa from 

 20 to 30, nearly sharp edges, laterally strongly echinulate, 

 variable in this respect, sometimes showing dissepiments (?) 

 or thin syna])ticiila extending between the septa ; calices deep ; 

 columella tuberculate or compressed, so as to be partially 

 laminate, the septa confluent. 



This form may be merely an abnormal mode of growth of 

 a laminate frond which has become curved, so that the mar- 

 gins united to form a hollow stem. It does not seem to 

 correspond to any described species. 



JMacclesfield Bank, 20^ fath. 



Genus Cycloseris, Ed. & H. 



Cycloseris cyclolites, Lam., sp. 



1816. Fimgia cyclolites, Lam. Hist, des Anim. sans Vertebr. t.ii. p. 226, 



2nd ed. p. 371. 

 18f:0. Cychf^eris cyclolites, Ed. & H. Hist. Nat. des Corall. t. iii. p. 50, 



pi. D12. fig. 3. 



A single dead specimen 40 millim. in diameter and 10 

 millim. in height is perhaps referable to this species, though 

 it is not more than half the height of typical examples of the 

 Epecies and the central fossette is more open. 



From the Tizard Bank, depth 28 fath. 



Cycloseris tenuis^ Dana, sp. 



1848. Fimgia tenuis, Dana, Expl. Exp. Zooph. p. 290, pi. xviii. fig. 1. 

 1860. Cycloseris he.iayonalis, Ed. & H. Hist. Nat. des Corall. t. iii. 



p. 61. 

 1881. Cycloseris tenuis, Moseley, 'Challenger' Rep. vol. ii. p. 191, 



pi. X. tig. 6«. 



There are several examples of tliis form, which range from 

 6 to 21 millim. in diameter and from 1"5 to 5 millim. in 

 height. The specimens are free with the exception of a 

 young individual, which has a short cylindrical stem and is 

 growing on a sponge, and one dead specimen. 



From the Tizard Bank, depth 27 to 2S fath. 



Cycloseris sineiisis, Ed. & II. 

 1851. Cycloseris sinensis, li,d. & H. Ann. des Sc. Nat. 3* s6t. t. xv. p. 112. 



One specimen, free, 26 millim. wide by 3*3 millim. high, 

 and an apparently young individual, 6 millim. wide, attached 

 by a short stem. 



From the i\Iacclcsfield Bank, deptli 20 fath. 



