64 
AUG. F. FOERSTE 
appearance of separation being due chiefl}^ to the presence of 
matrix along the depressed parts of the frond. 
Of specimen 5 both the obverse and reverse are present. The 
lobes are distinctly separated, and incline so that the upper mar- 
gin of each lobe is at a higher level than the lower margin of the 
next lobe, when the frond is held horizontally. Hair-like fibers 
extending from the margins of the lobes for a distance of 1 mm. 
are numerous, and some of these are directed distinctly at an 
angle with the plane of the lobes. Apparently these hair-like 
fibers were attached in part to the flat faces of the lobes. Six 
occur in a width of 0.5 mm. Reticulation among the fibers 
forming the lobes is present. Series of minute dots may be 
recognized among the* reticulating fibers. These served as 
points of attachment for the hair-like fibers. 
Specimen 6 presents a median, rachis-like film 0.4 mm. wide. 
The lobes slope, as in the preceding specimen. The hair-like 
fibers attached to the flat surface of the fronds are clearly shown, 
and several of these are replaced by rows of distinct black dots, 
7 or 8 in a length of 0.5 mm., interpreted as denticulations on 
the lateral margins of these fibers. Viewed from the side, the 
reticulating fibers forming the fronds present approximately 
circular, rather than flattened cross-sections. 
Specimen 11 shows a tendency toward distinct lobes. Both 
reticulated and hair-like fibers are present. In addition there 
are several rows of black dots. Some of the hair-like fibers 
appear to arise from these dots and to extend beyond the margin 
of the frond. 
Specimen 12 presents similar rows of black dots, both among 
the reticulated and among the hair-like fibers. Among the 
latter the dots are distinctly smaller. Of the larger black dots 
in the frond 6 occur in 1 mm.; on the hair-like fibers 5 to 7 dots 
occur in 0.5 mm. Some of the hair-like fibers are 1.5 mm. long. 
Specimens with more numerous lobes. — In the specimens 
represented by figure 3 on plate V and figure 20 on plate VI, more 
numerous lobes occur, than in the specimens described so far. 
The first of these specimens exposes several fronds with 9 or 10 
lobes in a length of 10 mm.; the second has 11 lobes in the same 
length. 
