88 PALJEONTOLOGY OF NEW YORK. 



Stictopora gbanatcla, n. sp. 



PLATE XI, FIG. 18; AMD PLATK XXIII A, FIQ. 17. 

 In part TrenuUopora rhomMfera, Hall. Report of State Geologist for 1882. Expl. pi. 11, figs. 15-20. 



ZoARiDM ramose, flattened; bifurcations moderately distant; branches not 

 widely diverging; width, just above a bifurcation, 1 mm., increasing to 2 

 mm. Transverse section lenticular, greatest thickness .80 mm. Non-cellu- 

 liferous space, at the margin, very narrow, scarcely perceptible. Cell aper- 

 tures elongate-oval, length .33 mm., width .20 mm. ; very closely disposed 

 in more or less regular, oblique, transverse rows : margins very thin, slightly 

 elevated or obsolete. Intercellular space generally flat and granulose ; 

 sometimes elevated and smooth. 



This species very much resembles a flattened specimen of Trematopora (Ortho- 

 pora) rhombifera, and might be readily mistaken for it when only the external 

 characters can be seen. 



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

 group, at Catskill creek, and near Clarksville, N. Y. 



PTILODICTYA, Lonsdale. 1839. 

 Ptilodictta lirata. 



PI^TE XVII, FIGS. 1-4 ; and PLATE XXni A, FIG 20. 



Bscharopora lirata, Halu Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 100. 1874. 

 " Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 161. 1879. 

 In part Bsefiartrpora lirata. Hall. Report of Stiite Geologist for 1882. Expl. pi. 17, fig-s. 1-6. 1883. 



ZoARiuM small, ensiform ; gradually enlarging for a short distance from an 

 obtusely pointed, striated base, the sides then becoming parallel ; width from 

 1.50 to 2 mm. ; transverse section lenticular, greatest thickness .75 mm. 

 Celluliferous on both faces. Cells tubular, arising obliquely from the mesial 

 lamina. Apertures elongate-oval, length .30 mm., width from .16 to .20 

 mm. ; disposed in longitudinal parallel rows, five or six rows on each face. 

 The apertures of the two outer rows larger than the others and oblique to 



