BRYOZOA—TREPOSTOMATA. 



139 



FlG. 193. Trematopora tu- 

 berculosa with enlargement of 

 surface. 



XLVI. Trematopora Hall. 



Zoarium ramose ; surface smooth or with monticules ; zocecia 



thin walled, the contact lines of walls of adjoining zocecia distinct ; 



diaphragms few, in the proximal end of zocecia ; apertures circular 



or oval with a more or less well-marked peristome ; interspaces 



solid ; mesopores irregularly angular, 

 often obscurely moniliform, with dia- 

 phragms at the constricted parts ; acan- 

 thopores of medium or small size usually 

 present. 



76. T. tuberculosa (Hall). (Fig. 193.) 



Siluric. 



Irregularly ramose and stout branches; 



tuberculous monticules ; tubular cells 



with oval apertures and thin elevated 



calicle or margin which is spinulose (bearing acanthopores) ; in- 



terapertural spaces solid, but separate below. 



Rochester shales of New York. 



XLVII. Callopora Hall. 

 Branching, and frequently anastomosing into bushy clumps, 

 with prismatic zocecia which later become, in most cases, cylindri- 

 cal, and have their apertures operculated ; diaphragms closely set 

 except in central part of tube, and crowded in the angular meso- 

 pores. Ord.-Sil. 



77. C. multitabulata (Ulrich). (Fig. 188, n, \go y n.) Ordovicic. 

 With strongly elevated monticules, few mesopores and numer- 

 ous diaphragms. 



Black River and Trenton of Kentucky, Tennessee, Minnesota, 

 Canada, etc. 



78. C. ramosa (d' Orbigny). (Fig. 194, 1.) Ordovicic. 

 Forming large clusters of stout, irregular, cylindrical stems, with 



strong, sharp monticules subregularly arranged, rarely uniting into 

 ridges. 



Common in the Lorraine of the Cincinnati region. 



79. C. dalei (E. and H.) (Fig. 194, 3.) Ordovicic. 

 Branches more slender than preceding and with less prominent 



monticules, which sometimes unite into ridges, as in the next 

 species. 



Lorraine beds of the Cincinnati region. 



