American Palceozoic Bryozoa. 



137 



Monticuliporoids. On the other hand, the generic character excepted, 

 points to a relationship with the Fistuliporidce, since in J)idymopora, 

 a proposed genus of that family, precisely the same feature is present. 

 This relationship is further assured by some Upper Silurian species of 

 Cceloclema, Ulrich, which approximate quite closely to some of the 

 hoi low- branched species of F 'is tulip or a; and I have several undescribed 

 species from the Sub-carboniferous strata of Kentuck\', which fully 

 establish the relationship. That others may be able to recognize 

 these forms, I will here briefly describe two of them. The}' possess 

 certain characters which our present knowledge of such types justifies 

 me in considering of generic importance; and as I am very much in 

 doubt whether they are more properly arranged with the Ceramopor- 

 idce or the Fistuliporidce, the propriety of proposing a new genus for 

 their reception becomes eminent. Following is a brief description of 

 the characters of the genus proposed. 



Eridopora, nov. gen. 



Zoarium thin, incrusting. Cell-mouths sub-triangular or ovate, and 

 more or less oblique, with the margin strongly elevated on one side, or 

 the "lip" may extend unequally all around the aperture, it being 

 always more prominent on one side than on the other. Cell orifices sur- 

 rounded b} r from one to three series of smaller, angular interstitial 

 cells, which, when the zoarium is well preserved, are covered by an 

 interstitial membrane. Longitudinal sections show that the inter- 

 stitial cells do not form tubes, but, instead, the intertubular spaces 

 are occupied by vesicular tissue. 



Type, Eridopora macrostoma, n. sp. 



As may be gathered from the above description, the genus is exactly 

 intermediate between Ceramoporella, Ulrich, and Fistulipora, McCoy. 

 Externally its species resemble the former, while their external char- 

 acters simulate very closely those of certain species of the latter genus. 



Eridopora macrostoma, n. sp. (Plate VI., figs. 2, 2a.) 



Zoarium incrusting, forming thin expansions over foreign bodies. 

 Cells oblique, large, about six in the space of .1 inch, with triangular 

 orifices and prominent lip. The single or double series of small 

 interstitial cells are readily observed only in worn specimens, the large 

 cells in a perfectly preserved example appearing contiguous. Scat- 

 tered over the surface, at somewhat irregular intervals, are groups of 



