218 PALEONTOLOGY OF NEW YORK. 



what larger cell apertures, the more elevated mesopores, the more prominent 

 monticules, and the greater central space, destitute of cell apertures. 

 Formatim and locality. Hamilton group, York, Livingston county, N. Y. 



FiSTULIPORA INTERASPERA, n. Sp. 



KOT FiaUBBD. 



ZoARiCM consisting of explanate fronds incrusting other objects, usually Cyatho- 

 phylloid corals; no masses formed by the superimposition of successive 

 layers of growth have been seen; thickness of observed fronds from 

 .50 to 1 mm. Cells tubular, cylindrical, rectangular to the surface ; 

 septa frequent. Intercellular space vesiculose, vesicles near the base large, 

 irregularly disposed, a little smaller and more regularly superimposed above. 

 Cell apertures trilobate, length about .25 mm., width usually about two- 

 thirds the length, but sometimes equalling it, radiating from the maculae, 

 forming irregular, intersecting rows, which are usually distant about the 

 diameter of an aperture. Peristomes moderately thick, posterior portion 

 the more strongly elevated, with two slight denticulations, which, in the 

 course of growth, form two parallel ridges along the interior of the cell Avail. 

 Inter-apertural space flat, occupied by small angular pits, with comparatively 

 prominent nodes at the angles ; the nodes often almost entirely obscure the 

 mesopores, the interapertural surface appearing solid, granulose, and the 

 frond in this condition apparently belongs to the genus Lichenalia. Sur- 

 face marked by low, rounded, irregularly disposed monticules, the centers of 

 which are distant from each other about 5 mm. ; a depressed central space 

 of 1.50 or 2 mm. in diameter, destitute of cell apertures and occupied by 

 the minutely nodose mesopores. 



This species has a close resemblance to F. constrida, but may be distinguished 

 from that species by the more distant cell apertures, much more prominent 

 peristomes, more decidedly trilobate apertures, and the flat interapertural 

 surface ; it most nearly resembles F. unilinea, but it may be distinguished by 

 the somewhat smaller, more elongate and decidedly trilobate cell apertures, 



