NIAGARA FALLS AND VICINITY 



143 



^<P^N 







Fig. 33 Favosites niagarensis 



Genus halysites Fischer 

 [Ety. : a?jj<7i$, a chain] 



(1813. Zoognosia. 3d ed. t. 1, p. 387) 



Corallum forming a clustered and reticulated mass, composed of 

 long tubular, cylindric or compressed corallites, which are placed 

 side by side in intersecting and anastomosing laminae or lines, any 

 given corallite being united along its whole length with its neigh- 

 bors to the right and left, and each lamina of the corallum con- 

 sisting of no more than a single linear series of tubes. Walls of the 

 corallites strong and without pores, the free portions covered by a 

 continuous thick epitheca showing lines of growth. Small coral- 

 lites often alternate with the larger ones. Septa obsolete or repre- 

 sented by vertical rows of spines in cycles of 12. Tabulae well 

 developed, complete and simple, more numerous in the smaller 

 corallites. 



Halysites catenulatus (Linn.) (Fig. 39). Catenipora e s - 

 charoides (Lamarck) Hall (1852. Pal. N. Y. 2:127, pi- 35) 





; 





' <j 



'h/'J'h 



Fig. 39 Halysites catenulatus 



