132 • MONOGRAPH OF THE FOSSIL POLYZOA OF THE 



similar pores of Multiporma umbilicata or those seen scattered over the whole surface 

 many species of Eschara, Cellepora and other genera. 



The tuberculation over the surface of the cellules was only observed in a few in- 

 stances in very sheltered localities, but since most of the specimens examined by us 

 were worn, we were unable to detect it in the majority of cases. We have no doubt, 

 however, but what it will be found to be a constant character.' We seldom observed 

 more than a half dozen of the rounded tubercles on a single cellule. 



R. informata, d'Orb., Pal. Fr., vol. 5, p. 422. 



Cellepora informata, Lonsd. Quart. Jour. Geol. Soc, vol. 1, p. 505. 



0. informata, d'Orb., Prod. Pal, vol. 135, No. 2560. 



E. wfarmata, Tuomey and Holmes, Pliocene, S. Carolina, p. 15, pi. 4, f. 11, 12. 



? R. informata, Holmes, Post Pliocene, South Carolina, p. 6, pi. 1, f. 5. 



Colony encrusting, irregularly botryoidal, many layers. Cellules arranged irregu- 

 larly, normalty elongated, sides rounded slightly, but nearly parallel ; when crowded 

 they vary very much in form, being sometimes quadrangular, and even wider than 

 long, while in the normal state the proportions of length to breadth are about as 4 to 3. 

 Mouth terminal, circular, in the same plane as the upper surface, surrounded by a 

 slightly thickened lip, generally notched at the proximal margin. Surface of the 

 cellule convex, closely and minutely punctate, except just about the middle, where the 

 surface is elevated into a slight tubercle, visible only on very perfect cellules. Ovarian 

 vesicles large and globular, occurring profusely on some specimens, entirely absent on 

 others ; surface punctate. 



Miocene, Petersburg, Va., and South Carolina. 



The form figured by Prof. Holmes in his Post Pliocene of South Carolina, seems from 

 its mode of growth hardly to belong to this species, but since he does not figure the 

 cellules in that case, we can form no definite opinion. Under the description of B. 

 quadrangidaris (with which species, we are unacquainted) will be found Lonsdale's 

 account of the differences of the two species, which seem to be closely related. In ad- 

 dition to the characters given above, we might mention that we have never noticed 

 the mouth oval as Lonsdale says it sometimes occurs. The proximal end of each 

 cellule is somewhat lower than the distal end of the preceding one, so that the mouth, 

 which is terminal, is generally a little higher than the adjoining surface of the succeed- 

 ing cellule. When, as sometimes occurs, the small tubercle of the surface of the cellule, 

 is worn away, there is a perforation left that might be mistaken for a " special pore." 

 When two or more superimposed layers are broken through, they present a somewhat 

 columnar appearance, but not distinct enough to mislead the most careless observer. 



E. quadrangulaeis, d*Orb., Pal. Fr., vol. 5, p. 423. 



Cellepora id., Lonsd. Quart. Jour. Geol. Soc, vol. 1, p. 508. Id., d'Orbigny, Pro- 

 drome Pal., vol. 3, p. 136, No. 2562. 



