450 Messrs. J. Wood-Mason and A. Alcock on 



cycle of septa incomplete anJ iucoiisplcuoiis, and the pedicle 

 very prominent. 



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

 pressed, the jirimary and secondary costae are inconspicuous, 

 while in the other cycles in place of costte 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 fixirly well-graded scries, it might 

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

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

 madder-colour. 



2. Flabellam laciniatum, Philippi. 



riiylhxles laciniatum, Philijipi, Neues Jalirb. fiir Miueral. kc, 1841, 



pp. 663 and 664, pi. xi. b. fig. 2. 

 Flabellum htciniatuin, Edw. & H., Ann, Sci. Nat. (-3) ix. p. 270; Hist, 



Nat. CoraU. ii. p, 92. 

 Flahellum liiciniatum, Seguenza, Mem. Ac. Toiin. (ii.) xxi. p. 48^5, 



tav. X. fig. 7. 

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



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

 P Flabvlluni laciniatum, Lindstrijni, Svensk. Ak. Ilaudl. xiv. ii. p. 12. 



A single specimen, in very fair preservation, from Station 

 116, 405 fathoms, wdiich -we name with some confidence from 

 Pliiiippi'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 Flabellum. 



Fig, 15, 



FlubclUdH hwitnatum, V\\\\., natural size. 



We agree with Prof, ^loscley ('Challenger' Deep-sea 

 Madrcporaria, p. 170) in considering that his Flabellum ulu- 



