CORALS AND BRYOZOA. 



Favosites conicus. 



I'LATE III, FIGS. 4, B-13. 



Favosites conk-a. Hall. Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 112. 1874. 

 " " Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 146. 1879. 



conicus," Report of State Geologist for 1882. Expl. pi. 3, fig-s. 4, 6-13. 1883. 



CoRALLUM forming conical masses ; flattened at the base, which is covered by a - 

 strong epitheca, marked with concentric wrinkles and undulations and radi- 

 ating undulations formed by the cell tubes. Cells arising from the center of 

 the base and from an undefined central axis and quite abruptly curving to 

 the surface, increasing by interstitial additions; polygonal, from four to eight- 

 sided ; diameter at the surfiice varying from 1.5 to 3.5 mm.; walls compara- 

 tively strong ; interior with evidences of numerous spinules or small nodes. 

 Septa of about the same strength as the walls, irregularly arranged, varying 

 from eight to fifteen in the space of 10 mm. Mural pores comparatively 

 large, circular, with distinctly elevated margins, disposed in one, two and 

 sometimes three ranges. Where one or two ranges occur the pores are 

 reguliirly arranged one above the other; where three ranges occur the dis- 

 position is more irregular. 



Tlie conical form of this species and the irregularity in the size of the cells 

 distinguish it from every other known species of Favosites in the Silurian 

 rocks of New York. 



Formation and localitij. In the shaly limestone of the Lower Helderberg 

 group, near Ciarksville, N. Y., and at Cumberland, Md. 



Favosites sphjbriccs. 



PLATE VII, FIGS. 1-12; AMD PLATE VIII, FIG. 8. 



Uiirhtig .tj)li(erii„. Hall. Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 111. 1874. 



FiiDisitfK miniimui, " (In error) Thii-ty-.secontl Rejit. N Y. State Mus. Nat. Hist., p. 147. 1879. 



tfol Fbrosifes sjihericiii, Ukll. (— Astylospoiifria) Thirty-second Kept N. Y. State Mus. Nat. Hist , p. 



J4ti. 1879. 

 Fapositts sphtTKitx, Hall. ReixH-t of State Geologist for 1882. Kxpl. pi. 7, tigs. 1-12. 1883. 



CoRALLUM ma.ssive, variable in form. Cell tubes polygonal, generally hexagonal ; 

 length from 2 to 13 mm. or more; diameter from .25 to .35 ram. On the 

 surface are frequent inaculoD .5 mm. in diameter, where the cells are larger 



