450 Messrs. J. Wood-Masou and A. iVlcock on 



cycle of septa incomplete aiiJ incouspicuou.s, and the pedicle 

 very prominent. 



In the larger specimens the calicle is deep and more com- 

 pressed, the ])rimary and secondary costa3 are inconspicuous, 

 while in the other cycles in place of costa3 there are shallow 

 furrows, the columella is a small smooth dense plug in the 

 very bottom of the calicle, the fifth cycle of septa is complete, 

 and the pedicle is a small obtuse point. 



The difference between the two extremes is so marked that, 

 but for the possession of a fairly well-graded series, it might 

 fairly have been regarded as specific. The inside of the dry 

 corallum is, like the soft tissues of the polyp, of a dark 

 madder-colour. 



2. Flahelhun laciniatum^ Philippl. 



I'hyllodes laciniatum, Philippi, Neues Jalu'b. fiir Mineral, i&c, 1841, 



pp. 663 aud 664, pi. xi. b. lig. 2. 

 Flabcllum hicmiatum, Edw. & H., Ann. Sci. Nat. (3) ix. p. 273; IIi.'?'t. 



Nat. CoroU. ii. p. 92. 

 Flahellum laciniatum, Seguenza, Mem. Ac. Toiia. (ii.) xxi. p. 48o, 



tav. x. fig. 7. 

 ? Flahellum lacinintum, Duncan, Proc. Roy. Soc. xviii. p. 293; id. 



Trans. Zool. Soc. viii. p. 323, pi. xxxix. figs. 11, 14-18. 

 ? Flabellmn laciniatum, Lindstroni, Svensk. Ak. llaudl. xiv. ii. p. 12. 



A single specimen, in very fair preservation, from Station 

 116, 405 fathoms, which we name with some confidence from 

 Philippi's description. 



We are not able, however, to identify it with Prof. Martin 

 Duncan's figures, which appear to represent young and there- 

 fore not unequivocally determinable forms of Flahellum. 



Flahellum laciniatum, Phil., natural size. 



We agree with Prof. Moseley (' Challenger ' Deep-sea 

 Madreporaria, p. 170) in considering that his Flabcllum ala- 



