320 PEOFESSOE P. M. DUNCAN ON THE 



The columella is deep and not very large. 



There are four cycles of unequal septa in six systems. 



The pali of the third order are higher than the others. 



The calice is elliptical. 



Height of corallum -^ inch ; length of calice yo inch. 



The American deep-sea Paracyathi are Paracyathus confertus, Pourtales, rare, in 

 50 to 100 fathoms oiF the Florida reef; and 



Paracyathus dejilippi, Duch. et Mich., of the Antilles. 



Division Tuebinoliace^S. 



Genus Sphenoteochus, Mihie-Edwards & Jules Haime, op. cit. 1848. 



Sphenoteochus inteemedius, Miinster, sp. (Plate XLI. figs. 1-5.) 



MM. Milne-Edwards and Jules Haime distinguish between Sphenotrochm intermedms, 

 Miinster, sp., and Sjjhenotrockus millefanus, Defrance, sp., by writing " cette espece 

 {Sphenotrochus milletanus) est extremement voisine du Sphenotrochus intermedius: elle 

 nous parait n'en diiferer qu'en ce qu'elle est un pen plus elevee proportionnellement a 

 la largeur, et presque aussi epaisse a la base qu'au calice ; de plus les cotes sont moins 

 saillantes lateralement, et sont plus souvent interrompues" (Hist. Nat. des Corall. vol. ii. 

 p. 69). I do not think this establishes a specific distinction; and it appears to me 

 that the form from the British Crag, which was described by Mr. Searles Wood as 

 Turbinolia milletiana, and which- was decided to be Sphenotrochus intermedius by 

 MM. Milne-Edwards and Jules Haime, is really a variety of the French Falunian form. 

 Many specimens resembling the Crag forms have been dredged up in Tangier Bay in 

 35 fathoms, and oflF Cape Sagres in 45 to 50 fathoms. 



Genus S.^inoteochus, Duncan. 



The corallum is simple, fiatly turbinate, and adherent by a delicate peduncle. The 

 calice is flat. The septa are exsert ; the costse are delicate and numerous ; and the 

 columella consists of growths from the septal terminations. 



Sabinoteochus apeetus, Duncan. (Plate XLI. figs. 6-9.) 



The corallum is button-shaped. 



The wall is nearly horizontal, and forms a flat inverted cone, which is marked with 

 unequal costse. 



The calicular margin is open and circular, being festooned, however, by the projecting 

 primary and secondary septa. 



The fossa is shallow ; and the calice, as a whole, is slightly concave. 



There are four cycles of septa in six systems ; but occasionally some members of the 



