44 



PEOF. P. MAETIN DrNCAN's EEYISION" OF THE 



the costse. Calices .deep and widely open, with four cycles of 

 septa and a single crown of pali. Columella large, composed of 

 numerous trabeculsD. Gemmation alternate. 



Distribution. — Hecent. Off Eio de la Plata, 600 fms. 



Grenus Haplohelia, Heuss, "Anth. und JBryoz. des Mainzer Ter- 

 tidr.,'' Sitzungsl. der Kais. AJcad. der Wiss. Wien, 1865, 

 p. 202. 



Colony branching. Calices on one side o£ the stem. Columella 

 small, papillary. Septa in three cycles, and papillose pali before 

 the primaries and secondaries. Costse as long lines of long gra- 

 nules with intermediate depressions running along the whole 

 branch. 



Distrilution. — Fossil. Miocene : Europe. 



IV. Alliance PROHELIOIDA. 



Oculinidae with branched espalier-like colonies. Corallites projecting 

 and twisted. Columella styliform. No pali. Septa entire, CcEnen- 

 chyma well developed. 



Genus Proiielia, E. de Fromentel. 

 Genus absorbed : — Stylangia. 



Grenus Peohelia, F. de Fromentel, Introd, d V etude des Foly^p, 

 foss. p. 177 (1861). 



Syn. Stylangia^ E. de Erom. 



Colony branched, espalier-like. Calices projecting, placed in 

 two parallel series along the sides of each branch, and all are 

 directed forwards ; they spring from the posterior part of tlie 

 branches and twist to the right or left to come to the front. 

 Columella styliform. Sej)ta entire. Costae rudimentary. CcBnen- 

 chyma very developed, compact and strongly granulated. 

 Distribution, — Fossil. Jurassic and Cretaceous : Europe, 

 This genus absorbs, according to M. de Eromentel, his genus 

 Stylangia, 



V. Alliance STYLOPHOROIDA. 



Oculinidae with arborescent, palmate, or incrusting colonies. Septa 

 few, 10 or 12 or 24, unequal. Columella styliform. Coenenchyma sub- 

 compact, compact, or cellular, granular. Costae developed, short or absent. 

 Dissepiments present. Gemmation irregular. 



