504 Report of the State Geologist. 



anastomosing at short and regular intervals in such a manner 

 as to give rise to a regularly disposed system of f enestrules ; cell 

 apertures disposed in from three to seven longitudinal rows; 

 branches without a median keel. 



Many of the forms included in this genus have been described 

 under the name Retepora, owing to a misapprehension of the 

 characters of that genus. By some authors it is considered a syn- 

 onym of Pbyllopora, but the original figures of that genus show 

 that the branches are connected by celluliferous dissepiments, 

 not by anastomosis. 



The genus most nearly resembles Poltpora in its general 

 appearance, but it differs from that genus in the anastomosis of 

 the branches. 



Reteporina, D'Orbigny. 

 (Prodrome.de Pal. t. i., p. 101.) 



Type, Metejporina j[)risca^ Goldfuss (sp.). 

 (Plate 1, figs. 6-8.) 



" Ce sont des Polypora dont les cellules places sur deux lignes 

 paralleles, rapproches, regulieres, longitudinales, non separees par 

 une cote, sont a la partie superieure des branches largement 

 anastomosees de maniere a ne laisser entre elles que des oscules 

 oblongs, reguliers, places par lignes divergentes." 



This genus differs from Keteporella in having only two rows 

 of cell apertures. 



The original diagnosis states that the rows of apertures are 

 not separated by a ridge, but as we have seen in Fenestella, the 

 presence or absence of a carina, all other characters being the 

 same, is not of generic importance. 



Cycloporina, Simpson. 

 (Ann. Kept. State Geologist for 1893.) 

 Type, Cycloporina hemicycla^ Hall (sp). 



(Plate 3, figs. 1-5.) 



Bryozoum having the same general aspect as Reteporina ; at 



irregular intervals, but invariably over a dissepiment, there are 



semi- circular, lateral projections from the carina, which extend 



about half the distance to the adjacent carina. Frequently the 



