178 PALEOZOIC PALEONTOLOGY. 
almost directly across the volutions, the other obliquely forward and 
outward from the band. Finally, in certain lights, a third arrange- 
ment of the meshes will be observed, namely, in a series passing ob- 
liquely forward from the sides to the slt-band. The last direction 
is approximately at right angles to certain more or less distinct lines 
or varices of growth, which interrupt the regularity of the network on 
old examples.’—U rich and Scofield. 
PHRAGMOLITES COMPRESSUS Con. 
Plate XII., Figs. 16-17. 
1838. Phragmolites compressus Con., Ann. Rep. Geol. Sury. N. Y 
paL19: 
1847. Cyrtolites compressus Hall, Pal. N. Y., vol. I, p: desir 
40 A, figs. 2 a-f. 
a 
Shell discoid. Volutions two or three, shghtly embracing, strongly 
earinate upon the dorsum, subtriangular in cross-section, wider than 
high; the sides moderately convex from the base of the carina to 
the margin of the umbilicus, where they are bent abruptly inward 
at nearly right angles to the plane of the shell; umbilicus from two- 
fifths to one-half the total diameter of the shell. The lateral surfaces 
marked by slightly-oblique, transverse, imbricating, folded, lamellar 
expansions, whose position, when removed, is indicated by transverse, 
wavy lines. 
he dimensions of the only specimen observed are: maximum di- 
ameter, 9 mm.; width of aperture, 4.5 mm. 
remarks.—This shell is not a common one in the Trenton hmestone 
of New Jersey. On removal from the limestone matrix in which it 
occurs the lamellar expansions of the shell, and frequently the shell 
substance itself, is entirely removed, so that the wavy, transverse lines 
characteristic of the genus are almost or wholly obliterated. The 
proposal of a new generic name, Conradella, by Ulrich and Scofield 
for this group of shells seems to be entirely unwarranted, for although 
Conrad’s name, Phragmolites, was but briefly defined and was pro- 
posed under the supposition that it belonged with the Cephalopods 
