276 PALAEONTOLOGY OF NEW YORK. 



Reptaria nodata. 



KOT FIGDRBD. 



PtUinnellanodata, Hau.. Tmns. Albany Institute, vol. x, p. 195. 1881. 

 " " " Report of Stjite Geologist for 1883, p. 57. 1884. 



ZoARiUM incrusting or free, procumbent, ramose, consisting of a rachis, from 

 which proceed lateral tubular cells, and at irregular dist<ance8 branches or 

 tubules, which have the same manner of growth as the primary rachis ; angle 

 of divergence from fifteen to ninety degrees. Cell tubes sub-cylindrical, more 

 or less angular, transverse section depressed-oval, length from 3 to 3 50 mm., 

 width a little less than .60 mm., near the extremity turning abruptly outward ; 

 generally alternating, occurring at intervals of a little more than 1 mm. on 

 each side of the rachis, and diverging from it at an angle of about thirty-five 

 degrees ; in contact for nearly their entire length, frequently overlapping 

 and having the appearance of coalescing; each succeeding cell projects 

 about .50 mm. beyond the preceding one, giving to the margin of the frond 

 a serr.ated appearance ; apertures parallel with the axis of the branch, not ele- 

 vated above the surface, broadly oval, width about three-fourths the length. 



The cell tubes are strongly annulated or nodose ; sometimes the annula- 

 tions extend entirely across the tube, but frequently there is a line of strong 

 nodes along the middle, and others on the margins ; on account of the over- 

 lapping of the tubes the marginal nodes are often in contact with the central 

 line of nodes of the succeeding cells, coalescing with them, and giving to the 

 cells the appearance of being connected by lateral processes ; there are about 

 four annulations or nodes in the space of 1.50 mm., and also fine undulating 

 striae, which have the appearance of being continuous from one cell to another. 

 On account of the overlapping of the cells the angularity is obscure, and upon 

 cursory examination they often appear flat, with two rows of prominent 

 nodes, one on each margin. 



This species may be distinguished from Reptaria stolonifera by the larger 

 cells, wider frond, and much more prominent nodes : from Hederella conferta by 

 the different appearance of the rachis, the angular cell tubes, and the prominent 

 annulations and lines of nodes. 



