276 
PALAEONTOLOGY OF NEW YORK. 
Reptaria nodata. 
NOT FIGURED. 
Ptllionella nodata, Hall. Trans. Albany Institute, vol. x, p. 195. 1881. 
“ “ “ Report of State Geologist for 1883, p. 57. 18S4. 
Zoarium incrusting or free, procumbent, ramose, consisting of a rachis, from 
wiiicli proceed lateral tubular cells, and at irregular distances 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 serrated 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 
strios, 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. 
