NORTH AMERICAN GRAPTOLITES 87 
proximal portion of the polypary. Possibly a second median appendage may 
underlie (as the first overlies) the notch left by the diverging adjacent mar- 
gins of the lateral appendages. 
This species is much less common than C. curvilatus. I have not as yet 
seen it in the Point Levis shales. The lateral appendages differ from those 
of C. curvidatus in their smaller size, triangular shape and in the single 
marginal filament, interrupted at intervals. 
Caryocaris oblongus Gurley, sp. nov. Plate IV., Fig. 2. 
Species known only in the form of the lateral appendages. These are 
roundish-oblong, about 15™" long and about 3” wide, showing near the 
proximal part a discolored spot which probably represents the ‘ tubercle.” 
Appendages superposed as in the other species of the genus. Substance 
thinner, presenting no evidence of structure. Filaments absent. No trace of 
median appendages. 
Horizon and locality.—Calciferous shales, Point Levis, Canada. 
This species is distinguished from the other two by its regularly oblong 
shape. There is no evidence that it represents a developmental stage of C. 
curvilatus. 
Caryocarus curvilatus Gurley, sp. nov. Plate IV., Fig. 3; Plate V., Fig. 3. 
Species known only in the form of the lateral appendages. These are 
broadly elliptic in outline, 20 to 30™™ long; 
one margin convex, bordered by half a dozen horse-hair-like filaments which 
Io™™ wide, more or less; with 
run parallel converging toward the ends, enclosing a ribbon-like space which 
is obscurely transverse-striate (merely transverse-wrinkled ?); superior mar- 
gin with two acute processes between which extends a row of cilia-like pro- 
cesses; outer margin bordered by a single filament. 
Horizon and locality. 
Point Levis, Canada. 
This species presents very perplexing varieties of facies from differences 
in the amount and direction of pressure, and perhaps differences of age. 
Thus the width may be only one-third the natural, greatly altering the appear- 
ance of the species. But most difficult to decipher are the complicated 
foldings and refoldings of the marginal filaments; usually, however, these 
retain their parallelism. This latter fact implies that they were united by a 
thin membrane. The frequent foldings, however, show that they were either 
free except at one end, or (more probably, perhaps) that the uniting material 
was so thin as to offer no resistance to flexion. 
Although the number of specimens are very numerous (forming more 
than one-half of the whole number of graptolite specimens from Nevada), 
I have not seen one specimen possessing the proximal portion. Several have, 
Upper Calciferous, Summit, Nevada; Calciferous, 
