178 MONOGRAPH OF THE FOSSIL POLYZOA OF THE 



an impressed ring, parallel with the mouth, surrounding it. In old colonies the po- 

 sition of the mouth is generally shown by a slight elevation. 



Common in the Cretaceous' near Mullica Hill, and found also at Timber Creek. 



Some specimens of this species resemble our Escliarifora typica, but can be distin- 

 guished by the above-mentioned labiate processes and by the circular mouths. 



MULTICRESCIS, d'Orb. 



Colony composed of free rounded branches, covered with many layers of cellules all 

 round. Cellules scattered or placed at regular distances, with numerous intermediate 

 pores placed between them. 



With the same external appearance as Heteropora, this genus is distinguished by 

 having numerous superposed layers of cellules. 



M. parvicella, fig. 70. 



Id., G. and H., Proc. Acad. Nat. Sci. Phila. 1860, p. 367. Id. G. and H., Jour. 

 Acad. vol. 4, 2d ser. p. 401, pi. 09, figs. 36—38. 



Colony in round irregular branches, often anastomosing, composed of several layers 

 of cellules, (in one instance four were counted). Cellules placed at some distance 

 apart ; mouth bordered by a distinct, raised lip when perfect. Intermediate space- 

 perforated by numerous small rounded pores. In worn colonies it is at times difficult 

 to distinguish the difference between these pores and the cellular mouths. The cel- 

 lules sometimes show an accidental grouping. 



Found, not very abundantly, both at Timber Creek and near Mullica Hill, N. J. 

 Miocene. 



M. tortilis, G. and H. 



Heteropora id., Lonsd. Quart. Jour. Geol. Soc, vol. 1, p. 501, fig. Id., Holmes 



Pliocene, South Carolina, p. 16, pi. 4, f. 15, 16. (very good). Id,, d'Orb. Pal. 

 Fr. Terr. Cret,, vol. 5, p. 1070. 

 Geripora id., d'Orb. Prod. Pal. Strat., vol. 3, p. 150, No. 2787. 

 Colony in large round branches, sometimes widened and at others anastomosing, 

 composed frequently of three or four distinct, easily separable layers. Cellules placed 

 irregularly, and with large irregular intermediate angular pores filling up all of the 

 intervening space. Walls thin ; thickness very nearly uniform. 



Common in the Miocene (Pliocene of Holmes) of Virginia and South Carolina. 

 This species resembles somewhat, in its mode of growth, M. Michelini, d'Orb., though 

 the branches are usually more cylindrical. The extreme thinness of the walls 

 both of the cellules and of the intermediate pores is its strongest distinguishing 

 character. 



