1 66 NEW YORK STATE MUSEUM 



pores) which give the entire surface an asperato-granular 



appearance. 



Found in the Rochester shale at Lockport (Hah), and probably 



also at Niagara. 



Genus bythopora Miller & Dyer 



[Ety, : I36d6<$, depth; nopu?, pore] 



(1878. Contrib. to paleontology no. 2, p. 6) 



Zoarium usually with slender branches, sometimes 



of considerable size; diaphragms obsolete; apertures 



oblique, narrowing above; interspaces canaliculate; 



'% mesopores few; acanthopores strong, rarely more than 



^- ' one to each zoarium, sometimes wanting. 



v^ ' Bythopora spinulosa (Hall) (Fig. 64). Trematopora 

 spinulosa Hall {Pal. N. Y. 2:155, pi. 40A) 

 ^ ' Distinguishing characters. Oval apertures; cylindri- 



.^ '< cal branches; strong spines (acanthopores) arranged at 



nearly regular intervals. 



Found in the Rochester shale at Lockport. (Hall) 



Fig. 64. Bytho- 



^niarged^*'"''^'^''' Probably occurs also at Niagara. 



Genus trematopora Hall 

 [Ety.: rpriixa, foramen; 7ro/>o9, pore] 

 (1852. Pal. N. 7. 2:149) 



Zoarium ramose ; surface smooth or with monticules ; zooecia thin- 

 walled, the contact lines of walls of adjoining zooecia distinct; dia- 

 phragms few, in the proximal ends of the zooecia; apertures circular 

 or oval, with a more or less well marked peristome; interspaces solid; 

 mesopores irregularly angular, often 

 obscurely moniliform, with diaphragm.s r ,^ { -^l 



at the constricted parts; acanthopores ' ■ ' ' . ' 

 of medium or small size usually present. ^. ^v/r;^ 



Trematopora tuberculosa Hall (Fig. 

 65) (1852. Pal. N. Y. 2:149, pi. 40A, 

 fig. la-g) 



Distins;uishino; characters. Irregularly 



^ *^ o -- pjg g- Trematopora tuberculosa with 



ramose and stout branches ; tuberculous enlargement of surface 

 monticules; tubular cells with oval apertures and thin elevated cali- 

 cle or margin which is spinulose (bearing acanthopores); inter- 

 apertural spaces solid, but septate below. 



