84 PEOP. P. MAETiN Duncan's eeyision of the 



Genus Euphtllia, Milne-Edioards Sf Jules Saime, Sist. Nat. 

 des Corall. vol. ii. p. 191 (1857). 



Syn. Plocophyllia, Eeuss ; Stenogyra, E. de From. ; Fromen- 

 telia, Eerry. 



The colony is csespitose or subfoliaceous. The base increasing 

 but little with age. The corallites increase fissiparously, and 

 either some separate or others remain united in series of greater 

 or less length. These series are always free at their sides and 

 their calicinal centres remain distinct, except in very long 

 series, where they are indistinct. There is no columella. The 

 septa are very numerous, very thin and exsert, long from the 

 axis to the margin, and often folded a little ; their sides are 

 smooth, and the free upper edge is entire. The wall is thin, 

 naked, almost smooth inferiorly, and costulate near the calices. 

 The endotheca is abundant, low down, and vesicular. 



The genus is divided into two groups. In the first the colony 

 is in the shape of a csespitose bush or tuft. 



Distribution. — 'Recent. Pacific, N. Australian seas, and Sin- 

 gapore. 



The second group has the colony in the shape of meandroid 

 laminae of greater or less length. 



Distribution. — Fossil. Jurassic, Cretaceous, Eocene, Miocene : 

 Europe, Asia. — Recent. Chinese and Indian seas. 



M. de Eromentel founded the genus Stenogyra, Introd. al'etude 

 des Polyp, foss. p. 153 (1858) ; but it does not appear to differ from 

 the second group of Eupliyllia except in the thickness and gra- 

 nulation of the septa. I propose to absorb it in Euphyllia ; and 

 therefore the antiquity of the genus is put back to the Jurassic 

 age. Eeuss's genus Dlocopliyllia is absorbed in the second group 

 of Dvphyllia, the species having well-marked costge to the base. 



Grenus GtLTPHOPHTLLIa, D. de Frooneoitel, Dal. Drang., Terr. 

 cret. p. 463 (1877). 



Colony in rather thin laminae, flabelliform, and free at the sides. 

 Calice of one large, shallow series, straight or slightly bent, broad. 

 Columella absent. Septa large and thick, dentate or lobed, thin 

 towards the axis, and usually alternately large and small. Costse 

 dentate and granular, more or less covered with epitheca. 



Distribution. — Fossil. Cretaceous : Europe. 



This genus is doubtfully separable from Euphyllia. 



