FAMILIES AND OENERA OF THE MADREPORAllIA. 



53 



slightly or not compressed. Columella absent. Septa large and 

 exsert. Costse straight, simple. Wall naked. Endotheca scanty. 



Distribution. ^Fossil. Cretaceous: England, Europe. Eocene; 

 Europe. 



Coelosmilia fecunda, Pourtales, from the Florida seas, was 

 placed by him in the genus Parasmilia (' Corals of the Blake 

 Expedition,' p. 109). 



The genus Brevismilia, Bolsche, was founded on a figure given 

 by Eoemer of his Lithodendron nanmn. It can hardly stand. 



Genus Diploctenium, Goldfuss, Petrefacta GermanicBy t. i. p. 50 

 (1826) ; Milne- Edwards Sf Jules Haime, Hist. Nat. des 

 Corall. vol. ii. p. 166 (1857). 



Corallum simple, exceedingly compressed, subflabelliform, with 

 the flanks directed downwards ; free, pedicellate. Wall naked, 

 with numerous close subequal costse, which divide and subdivide. 

 The very long calice has its axes very unequal ; it is narrow and 

 deep. Columella absent. Septa very numerous, slightly exsert, 

 nearly equal. Endotheca well developed. 



Distribution. — Fossil. Cretaceous : Europe. 



Tribe II. 



Genus Montliyaltia, Lamouroux, Exp. meth. des genres des 

 ^olyp. p. 79 (1821) ; Milne-Edwards ^ Jules Haime, Hist. 

 Nat. des Corall. vol. ii. p. 296 (1857). 



The corallum is simple, and either fixed by a broad base or free, 

 and in this last case pedicellate, or with a scar of former adhesion. 

 Variable in shape, some being turbinate, sub turbinate, cylindro- 

 conical, or discoid. Wall feebly developed, covered with a well- 

 developed epitheca. Calice circular, subcircular, elliptical, deep 

 or shallow, or convex in some discoid forms. No columella. Septa 

 stout and numerous, dentate or spiny, or nodulose or lobed, often 

 exsert. Endotheca abundant. 



Distribution. — Fossil. Trias to Eocene : Europe. Jurassic, 

 Cretaceous, Eocene, Miocene : Asia. Jurassic : England. — 

 Becent, Caribbean Sea. 



Montlivaltia discus, Wood (Australia, recent) , is not a species of 

 the genus. It has clearly synapticula, and is one of the Eungida). 

 Subgenera ; — Leptomussa ; Oppelismilia ; Ceratophyllia. 



