138 Cincmnati Society of Natural History. 



but all have an oblique aperture, and are provided with a lip. The 

 interstitial cells are few, and mural i)ores are sometimes present. 

 Enough features exist to make it a genus distinct from Monticuli- 

 para, but hardly enough to exclude it from the family. 



The same can not, however, be said of Ceramoporella, Ui., 

 for in this the distinctions are numerous interstitial cells, covered 

 in the mature state by a thin membrane.* It should be regarded 

 as a synonym of MonticiiUpoya. 



CheilopLvella, Ul., has never been fully characterized, and the 

 features given for it, "heavy crusts, or rising upward into flabel- 

 late fronds, tubes long, traversed by few straight diaphragms, 

 cell apertures ovate, interstitial tubes numerous, "'t are too few, 

 and too variable to be of value, so it, too, is reduced to a syno- 

 nym. 



Crepipora, Ul., is evidently synonymous with Cerainopora, 

 Hall, the cell apertures being oblique, with a projecting lip, few 

 interstitial cells and few diaphraghms.!]; 



Eridopora, Ul. , is externally like Ceramoporella and internally 

 like FistuUpora, thus forming a sort of connecting link between 

 the two genera, but as it is a Sub-Carboniferous genus we will not 

 be especially concerned with it just now. 



The larger number of these generic names have been coined 

 and defined by Mr. Ulrich in a scheme of classification published 

 in the volumes so often alluded to. In subsequent papers of the 

 same series, other genera were proposed, some were abandoned, 

 and some old ones subdivided into new ones. The following were 

 the later characterized genera : 



Hotnotrypa, Ul., was a name given to certain species which he 

 had before referred to lYeinatflpora, Hall. The features of the new 

 genus are the mode of growth, thickened walls in their outer por- 

 tion, and the presence of mural pores. >i If these latter are really 

 present, it would perhaps be a reason for establishing a new genus. 

 The fact is, however, that the forms referred by Mr. Ulrich to his 

 new genus have long been recognized members of the old genus, 

 and no reason exists for any change of generic name. 



Leptotrypa, Ul., was established for the reception of certain 

 species having thin, incrusting corallums, polygonal, thin walled 

 cells, of one kind only, and with small spiniform corallites occu- 



*Ibid v., 157. 

 f Ibid 157. 

 I Ibid p. 157. 

 iJllbid v., 240. 



