1*6 MONOGRAPH OF THE FOSSIL POLYZOA OF THE 



R. tubulata might possibly be confounded with our R. texta, but it differs in having 

 the mouth large, with a distinct border and situated in the same place as the rest of 

 the surface, while in our species the ends of the cell are depressed, and the mouth, 

 which is very small, is placed in the deepest part of the depression. In tubulata the 

 surface is almost even, while in texta each cellule is very convex in both diameters, 

 but esjoecially antero-posteriorly. The cells of tubulata are also shorter and broader 

 than those of texta. 



E. PETiOLUS, Lonsd., Quart. Jour. Geol. Soc. vol. 1, p. 528. 



" Foliaceous, springing from a stalk-like base ; cells oblong, surface slightly convex, porous, bounded by a 

 faint furrow, mouth longitudinally oval ; sometimes a small triangular pit by its side; interior of cells 

 lozenge-shaped; dorsal surface not separable; connecting foramina near the base of the lateral and terminal 

 walls." 



"No immature cells were observed, but in the youngest state exhibited the mouth had a projecting mar- 

 gin, which gradually disappeared in more advanced conditions; while in still older, the aperture was de- 

 pressed, and in the most aged totally obliterated. Other changes, dependant upon age, consisted in the 

 diminution and distinctness of the pores, and in the increased convexity of the surface, with a corresponding 

 greater depth in the separating furrows. An exposed dorsal surface was traversed by fractured edges of 

 the walls." 



'•' Locality. — Eutaw," [South Carolina, Eocene] 



E. incumbens, Lonsd., Quart. Jour. Geol. Soc. vol. 1, p. 529. 



R. incumbens, d'Orb., Prod. Pal. Strat. vol, 2, p. 397, No. 1176. 



" Foliaceous; cells oval, surface slightly convex, porous, boundary a very faint furrow, mouth round or 

 transversely oval, notched in mature state, and margin slightly thickened ; a round foramen sometimes on 

 one side of the mouth ; interior of cells, lateral walls slightly curved, terminal arched or nearly straight; 

 dorsal surfaces not separable ; gemmuliferous (?) vesicle large, semi-globular, resting on the next succeeding 

 cell ; connecting foramina near the base of side and terminal walls." 



" In addition to the aggregate of differential characters, this species is distinguished by the large over- 

 lying gemmuliferous (?) vesicle. From the mode of blending with the surface on which it rests, this 

 chamber might be mistaken for an irregularly developed cell ; but its true nature was shown by the absence 

 of distinct pores in the lamina forming the outer covering; by the great size and inclined position of the 

 opening and by the true mouth of the cell being detectable within the chamber in its right position. In 

 the oldest observed condition of the coral, the outer surface was greatly thickened, and the mouth of the 

 cell was partially or wholly obliterated." 



" Locality. — Rock's Bridge," [Eocene.] 



R. tinea, Lonsd., see Rscharinella tinea. 



E. '! viminea, Lonsd., Quart. Jour. Geol. Soc. vol. 1, p. 530. 



R. viminea, d'Orb., Prod. Pal. Strat. vol. 2, p. 397, No. 1178. 



" Foliaceous; cells elongated, surface convex, porous, mouth transversely oval, depressed, proximal edge 

 a notched plate; occasionally one or two foraminated vesicles at the corners of the proximal margin ; dorsal 

 separation perfect, surface (dorsal ?) ridged." 



" This species was distinguished by the wicker-like character of the general surface. Mouthless cells 

 were noticed among those in a mature condition. The aged cells presented a greatly thickened outer surface. 



