Hamilton Group. 



191 



Stictopora granifera, n. sp 

 Width of branches from 2.50 to 5 mm. ; greatest thickness 50 

 mm.; ceil apertures oval, nearly parallel with the surface ; length ,30 

 mm., irregularly and very closely disposed, frequently forming an irreg- 

 ular transverse row ; the elevated margins of the apertures, forming 

 the rows coalescent; margins strong, with from three to five nodes on 

 the summit i space between apertures striated; strge interrupted, hav- 

 mg numerous nodes ; non-celluliferous margin narrow, striated, striae 

 granulose ; the branches, so far as observed for a short distance above 

 a bifurcation contract, then expand quite abruptly. 



Locality — Pavilion, N. Y. 



Stictopora interstriata, n. sp. 

 Width of branches usually from 2.50 to 3 mm., much widened im- 

 mediately below the bifurcation; greatest thickness .65 mm.; aper- 

 tures oval, parallel with the surface; length .33 mm., usually disposed 

 in irregular transverse rows; margins, strong, elevated, and having 

 from their sides several minute denticulations extending toward the 

 center of the aperture; intermediate space having minute interrupted 

 striations. 



Locality — New York. 



Stictopora permarginata, n, sp. 

 Width of branches 1.25 mm.; greatest thickness .33 mm., apertures 

 oval, length .40 mm., margins very strongly elevated, generally closely 

 disposed ; some portion of the margins of adjacent apertures in con- 

 tact ; between adjacent apertures sometimes a single carina; margins 

 and carina with minute nodes or granules. 



Locality — Hamburg, N Y 



Stictopora ? scutulata, n. sp. 

 Only fragments of this species have been observed, from which it is 

 impossible to determine whether ramose or not. Width of branch 2 

 mm., greatest thickness .55 mm., apertures polygonal, coalescent, 

 length .25 mm., frequently arranged in oblique ascending rows ; mar- 

 gins thick, granulose, and frequently at the angles a short spinule. 



Locality — Lodi Landing, Seneca Lake, N. Y. 



Stictopora? suecarin-ata, n. sp. 

 Width of branch from 2 to 2.50 mm. ; greatest thickness 15 mm.; 

 apertures circular or oval, sometimes parallel with, at other times 

 oblique to, the surface • arranged in parallel longitudinal rows, usually 



